Merge branch 'volumes-related-refactorings' of https://github.com/excitoon-favorites/ClickHouse into volumes-refactorings

programs/copier/ClusterCopierApp.cpp

@@ -106,7 +106,7 @@ void ClusterCopierApp::mainImpl()
 
     context->setConfig(loaded_config.configuration);
     context->setApplicationType(Context::ApplicationType::LOCAL);
-    context->setPath(process_path);
+    context->setPath(process_path + "/");
 
     registerFunctions();
     registerAggregateFunctions();

src/Common/ErrorCodes.cpp

@@ -497,6 +497,9 @@ namespace ErrorCodes
     extern const int CANNOT_CONNECT_RABBITMQ = 530;
     extern const int CANNOT_FSTAT = 531;
     extern const int LDAP_ERROR = 532;
+    extern const int INCONSISTENT_RESERVATIONS = 533;
+    extern const int NO_RESERVATIONS_PROVIDED = 534;
+    extern const int UNKNOWN_RAID_TYPE = 535;
 
     extern const int KEEPER_EXCEPTION = 999;
     extern const int POCO_EXCEPTION = 1000;

src/Disks/IDisk.h

@@ -25,6 +25,7 @@ using DiskDirectoryIteratorPtr = std::unique_ptr<IDiskDirectoryIterator>;
 
 class IReservation;
 using ReservationPtr = std::unique_ptr<IReservation>;
+using Reservations = std::vector<ReservationPtr>;
 
 class ReadBufferFromFileBase;
 class WriteBufferFromFileBase;

src/Disks/IVolume.cpp

@@ -10,6 +10,25 @@ namespace DB
 namespace ErrorCodes
 {
     extern const int EXCESSIVE_ELEMENT_IN_CONFIG;
+    extern const int INCONSISTENT_RESERVATIONS;
+    extern const int NO_RESERVATIONS_PROVIDED;
+    extern const int UNKNOWN_VOLUME_TYPE;
+}
+
+String volumeTypeToString(VolumeType type)
+{
+    switch (type)
+    {
+        case VolumeType::JBOD:
+            return "JBOD";
+        case VolumeType::RAID1:
+            return "RAID1";
+        case VolumeType::SINGLE_DISK:
+            return "SINGLE_DISK";
+        case VolumeType::UNKNOWN:
+            return "UNKNOWN";
+    }
+    throw Exception("Unknown volume type, please add it to DB::volumeTypeToString", ErrorCodes::UNKNOWN_VOLUME_TYPE);
 }
 
 IVolume::IVolume(
@@ -40,4 +59,43 @@ UInt64 IVolume::getMaxUnreservedFreeSpace() const
     return res;
 }
 
+MultiDiskReservation::MultiDiskReservation(Reservations & reservations_, UInt64 size_)
+    : reservations(std::move(reservations_))
+    , size(size_)
+{
+    if (reservations.empty())
+    {
+        throw Exception("At least one reservation must be provided to MultiDiskReservation", ErrorCodes::NO_RESERVATIONS_PROVIDED);
+    }
+
+    for (auto & reservation : reservations)
+    {
+        if (reservation->getSize() != size_)
+        {
+            throw Exception("Reservations must have same size", ErrorCodes::INCONSISTENT_RESERVATIONS);
+        }
+    }
+}
+
+Disks MultiDiskReservation::getDisks() const
+{
+    Disks res;
+    res.reserve(reservations.size());
+    for (const auto & reservation : reservations)
+    {
+        res.push_back(reservation->getDisk());
+    }
+    return res;
+}
+
+void MultiDiskReservation::update(UInt64 new_size)
+{
+    for (auto & reservation : reservations)
+    {
+        reservation->update(new_size);
+    }
+    size = new_size;
+}
+
+
 }

src/Disks/IVolume.h

@@ -11,10 +11,13 @@ namespace DB
 enum class VolumeType
 {
     JBOD,
+    RAID1,
     SINGLE_DISK,
     UNKNOWN
 };
 
+String volumeTypeToString(VolumeType t);
+
 class IVolume;
 using VolumePtr = std::shared_ptr<IVolume>;
 using Volumes = std::vector<VolumePtr>;
@@ -61,4 +64,21 @@ protected:
     const String name;
 };
 
+class MultiDiskReservation : public IReservation
+{
+public:
+    MultiDiskReservation(Reservations & reservations, UInt64 size);
+
+    UInt64 getSize() const override { return size; }
+
+    DiskPtr getDisk(size_t i) const override { return reservations[i]->getDisk(); }
+
+    Disks getDisks() const override;
+
+    void update(UInt64 new_size) override;
+private:
+    Reservations reservations;
+    UInt64 size;
+};
+
 }

src/Disks/SingleDiskVolume.h

@@ -22,5 +22,6 @@ public:
 };
 
 using VolumeSingleDiskPtr = std::shared_ptr<SingleDiskVolume>;
+using VolumesSingleDiskPtr = std::vector<VolumeSingleDiskPtr>;
 
 }

src/Disks/StoragePolicy.cpp

@@ -71,7 +71,7 @@ StoragePolicy::StoragePolicy(
 }
 
 
-StoragePolicy::StoragePolicy(String name_, VolumesJBOD volumes_, double move_factor_)
+StoragePolicy::StoragePolicy(String name_, Volumes volumes_, double move_factor_)
     : volumes(std::move(volumes_)), name(std::move(name_)), move_factor(move_factor_)
 {
     if (volumes.empty())
@@ -257,7 +257,7 @@ StoragePolicySelector::StoragePolicySelector(
     {
         auto default_volume = std::make_shared<VolumeJBOD>(default_volume_name, std::vector<DiskPtr>{disks->get(default_disk_name)}, 0);
 
-        auto default_policy = std::make_shared<StoragePolicy>(default_storage_policy_name, VolumesJBOD{default_volume}, 0.0);
+        auto default_policy = std::make_shared<StoragePolicy>(default_storage_policy_name, Volumes{default_volume}, 0.0);
         policies.emplace(default_storage_policy_name, default_policy);
     }
 }

src/Disks/StoragePolicy.h

@@ -4,6 +4,7 @@
 #include <Disks/IDisk.h>
 #include <Disks/IVolume.h>
 #include <Disks/VolumeJBOD.h>
+#include <Disks/VolumeRAID1.h>
 #include <Disks/SingleDiskVolume.h>
 #include <IO/WriteHelpers.h>
 #include <Common/CurrentMetrics.h>
@@ -33,7 +34,7 @@ class StoragePolicy
 public:
     StoragePolicy(String name_, const Poco::Util::AbstractConfiguration & config, const String & config_prefix, DiskSelectorPtr disks);
 
-    StoragePolicy(String name_, VolumesJBOD volumes_, double move_factor_);
+    StoragePolicy(String name_, Volumes volumes_, double move_factor_);
 
     bool isDefaultPolicy() const;
 
@@ -65,16 +66,16 @@ public:
     /// Do not use this function when it is possible to predict size.
     ReservationPtr makeEmptyReservationOnLargestDisk() const;
 
-    const VolumesJBOD & getVolumes() const { return volumes; }
+    const Volumes & getVolumes() const { return volumes; }
 
     /// Returns number [0., 1.] -- fraction of free space on disk
     /// which should be kept with help of background moves
     double getMoveFactor() const { return move_factor; }
 
     /// Get volume by index from storage_policy
-    VolumeJBODPtr getVolume(size_t i) const { return (i < volumes_names.size() ? volumes[i] : VolumeJBODPtr()); }
+    VolumePtr getVolume(size_t i) const { return (i < volumes_names.size() ? volumes[i] : VolumePtr()); }
 
-    VolumeJBODPtr getVolumeByName(const String & volume_name) const
+    VolumePtr getVolumeByName(const String & volume_name) const
     {
         auto it = volumes_names.find(volume_name);
         if (it == volumes_names.end())
@@ -86,7 +87,7 @@ public:
     void checkCompatibleWith(const StoragePolicyPtr & new_storage_policy) const;
 
 private:
-    VolumesJBOD volumes;
+    Volumes volumes;
     const String name;
     std::map<String, size_t> volumes_names;
 

src/Disks/VolumeJBOD.cpp

@@ -64,7 +64,8 @@ DiskPtr VolumeJBOD::getNextDisk()
 
 ReservationPtr VolumeJBOD::reserve(UInt64 bytes)
 {
-    /// This volume can not store files which size greater than max_data_part_size
+    /// This volume can not store data which size is greater than `max_data_part_size`
+    /// to ensure that parts of size greater than that go to another volume(s).
 
     if (max_data_part_size != 0 && bytes > max_data_part_size)
         return {};

src/Disks/VolumeJBOD.h

@@ -32,6 +32,7 @@ public:
     /// - Used with policy for temporary data
     /// - Ignores all limitations
     /// - Shares last access with reserve()
+    // TODO: Remove getNextDisk, move it's behaviour to VolumeJBOD::getDisk(), if it was called without argument.
     DiskPtr getNextDisk();
 
     /// Uses Round-robin to choose disk for reservation.

src/Disks/VolumeRAID1.cpp

@@ -0,0 +1,28 @@
+#include "VolumeRAID1.h"
+
+#include <Common/StringUtils/StringUtils.h>
+#include <Common/quoteString.h>
+
+namespace DB
+{
+
+ReservationPtr VolumeRAID1::reserve(UInt64 bytes)
+{
+    /// This volume can not store data which size is greater than `max_data_part_size`
+    /// to ensure that parts of size greater than that go to another volume(s).
+
+    if (max_data_part_size != 0 && bytes > max_data_part_size)
+        return {};
+
+    Reservations res(disks.size());
+    for (size_t i = 0; i < disks.size(); ++i)
+    {
+        res[i] = disks[i]->reserve(bytes);
+
+        if (!res[i])
+            return {};
+    }
+    return std::make_unique<MultiDiskReservation>(res, bytes);
+}
+
+}

src/Disks/VolumeRAID1.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <Disks/createVolume.h>
+#include <Disks/VolumeJBOD.h>
+
+namespace DB
+{
+
+class VolumeRAID1 : public VolumeJBOD
+{
+public:
+    VolumeRAID1(String name_, Disks disks_, UInt64 max_data_part_size_)
+        : VolumeJBOD(name_, disks_, max_data_part_size_)
+    {
+    }
+
+    VolumeRAID1(
+        String name_,
+        const Poco::Util::AbstractConfiguration & config,
+        const String & config_prefix,
+        DiskSelectorPtr disk_selector
+    ) : VolumeJBOD(name_, config, config_prefix, disk_selector)
+    {
+    }
+
+    VolumeType getType() const override { return VolumeType::RAID1; }
+
+    ReservationPtr reserve(UInt64 bytes) override;
+};
+
+using VolumeRAID1Ptr = std::shared_ptr<VolumeRAID1>;
+
+}

src/Disks/createVolume.cpp

@@ -1,17 +1,53 @@
 #include "createVolume.h"
 
+#include <Disks/SingleDiskVolume.h>
+#include <Disks/VolumeJBOD.h>
+#include <Disks/VolumeRAID1.h>
+
+#include <boost/algorithm/string.hpp>
+
 namespace DB
 {
 
+namespace ErrorCodes
+{
+    extern const int UNKNOWN_RAID_TYPE;
+}
+
 VolumePtr createVolumeFromReservation(const ReservationPtr & reservation, VolumePtr other_volume)
 {
     if (other_volume->getType() == VolumeType::JBOD || other_volume->getType() == VolumeType::SINGLE_DISK)
     {
-        /// Since reservation on JBOD choices one of disks and makes reservation there, volume
+        /// Since reservation on JBOD chooses one of disks and makes reservation there, volume
         /// for such type of reservation will be with one disk.
         return std::make_shared<SingleDiskVolume>(other_volume->getName(), reservation->getDisk());
     }
+    if (other_volume->getType() == VolumeType::RAID1)
+    {
+        auto volume = std::dynamic_pointer_cast<VolumeRAID1>(other_volume);
+        return std::make_shared<VolumeRAID1>(volume->getName(), reservation->getDisks(), volume->max_data_part_size);
+    }
     return nullptr;
 }
 
+VolumePtr createVolumeFromConfig(
+    String name,
+    const Poco::Util::AbstractConfiguration & config,
+    const String & config_prefix,
+    DiskSelectorPtr disk_selector
+)
+{
+    auto has_raid_type = config.has(config_prefix + ".raid_type");
+    if (!has_raid_type)
+    {
+        return std::make_shared<VolumeJBOD>(name, config, config_prefix, disk_selector);
+    }
+    String raid_type = config.getString(config_prefix + ".raid_type");
+    if (raid_type == "JBOD")
+    {
+        return std::make_shared<VolumeJBOD>(name, config, config_prefix, disk_selector);
+    }
+    throw Exception("Unknown raid type '" + raid_type + "'", ErrorCodes::UNKNOWN_RAID_TYPE);
+}
+
 }

src/Disks/createVolume.h

@@ -1,12 +1,16 @@
 #pragma once
 
 #include <Disks/IVolume.h>
-#include <Disks/VolumeJBOD.h>
-#include <Disks/SingleDiskVolume.h>
 
 namespace DB
 {
 
 VolumePtr createVolumeFromReservation(const ReservationPtr & reservation, VolumePtr other_volume);
+VolumePtr createVolumeFromConfig(
+    String name_,
+    const Poco::Util::AbstractConfiguration & config,
+    const String & config_prefix,
+    DiskSelectorPtr disk_selector
+);
 
 }

src/Disks/ya.make

@@ -16,6 +16,7 @@ SRCS(
     SingleDiskVolume.cpp
     StoragePolicy.cpp
     VolumeJBOD.cpp
+    VolumeRAID1.cpp
 )
 
 END()

src/Interpreters/Aggregator.cpp

@@ -765,7 +765,17 @@ bool Aggregator::executeOnBlock(Columns columns, UInt64 num_rows, AggregatedData
         && worth_convert_to_two_level)
     {
         size_t size = current_memory_usage + params.min_free_disk_space;
-        const std::string tmp_path = params.tmp_volume->getNextDisk()->getPath();
+
+        std::string tmp_path;
+        VolumeJBODPtr vol;
+        if ((vol = dynamic_pointer_cast<VolumeJBOD>(params.tmp_volume)) != nullptr)
+        {
+            tmp_path = vol->getNextDisk()->getPath();
+        }
+        else
+        {
+            tmp_path = params.tmp_volume->getDisk()->getPath();
+        }
 
         // enoughSpaceInDirectory() is not enough to make it right, since
         // another process (or another thread of aggregator) can consume all
@@ -851,9 +861,21 @@ void Aggregator::writeToTemporaryFile(AggregatedDataVariants & data_variants, co
         ReadableSize(uncompressed_bytes / elapsed_seconds),
         ReadableSize(compressed_bytes / elapsed_seconds));
 }
+
+
 void Aggregator::writeToTemporaryFile(AggregatedDataVariants & data_variants)
 {
-    return writeToTemporaryFile(data_variants, params.tmp_volume->getNextDisk()->getPath());
+    String tmp_path;
+    auto volume_jbod = std::dynamic_pointer_cast<VolumeJBOD>(params.tmp_volume);
+    if (volume_jbod)
+    {
+        tmp_path = volume_jbod->getNextDisk()->getPath();
+    }
+    else
+    {
+        tmp_path = params.tmp_volume->getDisk()->getPath();
+    }
+    return writeToTemporaryFile(data_variants, tmp_path);
 }
 
 

src/Interpreters/Aggregator.h

@@ -24,6 +24,8 @@
 #include <DataStreams/IBlockStream_fwd.h>
 #include <DataStreams/SizeLimits.h>
 
+#include <Disks/SingleDiskVolume.h>
+
 #include <Interpreters/AggregateDescription.h>
 #include <Interpreters/AggregationCommon.h>
 
@@ -45,9 +47,6 @@ namespace ErrorCodes
 
 class IBlockOutputStream;
 
-class VolumeJBOD;
-using VolumeJBODPtr = std::shared_ptr<VolumeJBOD>;
-
 /** Different data structures that can be used for aggregation
   * For efficiency, the aggregation data itself is put into the pool.
   * Data and pool ownership (states of aggregate functions)
@@ -878,7 +877,7 @@ public:
         /// Return empty result when aggregating without keys on empty set.
         bool empty_result_for_aggregation_by_empty_set;
 
-        VolumeJBODPtr tmp_volume;
+        VolumePtr tmp_volume;
 
         /// Settings is used to determine cache size. No threads are created.
         size_t max_threads;
@@ -891,7 +890,7 @@ public:
             size_t group_by_two_level_threshold_, size_t group_by_two_level_threshold_bytes_,
             size_t max_bytes_before_external_group_by_,
             bool empty_result_for_aggregation_by_empty_set_,
-            VolumeJBODPtr tmp_volume_, size_t max_threads_,
+            VolumePtr tmp_volume_, size_t max_threads_,
             size_t min_free_disk_space_)
             : src_header(src_header_),
             keys(keys_), aggregates(aggregates_), keys_size(keys.size()), aggregates_size(aggregates.size()),

src/Interpreters/Context.cpp

@@ -319,7 +319,7 @@ struct ContextShared
     ConfigurationPtr config;                                /// Global configuration settings.
 
     String tmp_path;                                        /// Path to the temporary files that occur when processing the request.
-    mutable VolumeJBODPtr tmp_volume;                           /// Volume for the the temporary files that occur when processing the request.
+    mutable VolumePtr tmp_volume;                           /// Volume for the the temporary files that occur when processing the request.
 
     mutable std::optional<EmbeddedDictionaries> embedded_dictionaries;    /// Metrica's dictionaries. Have lazy initialization.
     mutable std::optional<ExternalDictionariesLoader> external_dictionaries_loader;
@@ -547,7 +547,7 @@ String Context::getDictionariesLibPath() const
     return shared->dictionaries_lib_path;
 }
 
-VolumeJBODPtr Context::getTemporaryVolume() const
+VolumePtr Context::getTemporaryVolume() const
 {
     auto lock = getLock();
     return shared->tmp_volume;
@@ -572,7 +572,7 @@ void Context::setPath(const String & path)
         shared->dictionaries_lib_path = shared->path + "dictionaries_lib/";
 }
 
-VolumeJBODPtr Context::setTemporaryStorage(const String & path, const String & policy_name)
+VolumePtr Context::setTemporaryStorage(const String & path, const String & policy_name)
 {
     std::lock_guard lock(shared->storage_policies_mutex);
 
@@ -583,7 +583,7 @@ VolumeJBODPtr Context::setTemporaryStorage(const String & path, const String & p
             shared->tmp_path += '/';
 
         auto disk = std::make_shared<DiskLocal>("_tmp_default", shared->tmp_path, 0);
-        shared->tmp_volume = std::make_shared<VolumeJBOD>("_tmp_default", std::vector<DiskPtr>{disk}, 0);
+        shared->tmp_volume = std::make_shared<SingleDiskVolume>("_tmp_default", disk);
     }
     else
     {

src/Interpreters/Context.h

@@ -108,8 +108,8 @@ using StoragePolicySelectorPtr = std::shared_ptr<const StoragePolicySelector>;
 
 class IOutputFormat;
 using OutputFormatPtr = std::shared_ptr<IOutputFormat>;
-class VolumeJBOD;
+class IVolume;
-using VolumeJBODPtr = std::shared_ptr<VolumeJBOD>;
+using VolumePtr = std::shared_ptr<IVolume>;
 struct NamedSession;
 
 
@@ -227,14 +227,14 @@ public:
     String getUserFilesPath() const;
     String getDictionariesLibPath() const;
 
-    VolumeJBODPtr getTemporaryVolume() const;
+    VolumePtr getTemporaryVolume() const;
 
     void setPath(const String & path);
     void setFlagsPath(const String & path);
     void setUserFilesPath(const String & path);
     void setDictionariesLibPath(const String & path);
 
-    VolumeJBODPtr setTemporaryStorage(const String & path, const String & policy_name = "");
+    VolumePtr setTemporaryStorage(const String & path, const String & policy_name = "");
 
     using ConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfiguration>;
 

src/Interpreters/SortedBlocksWriter.cpp

@@ -203,7 +203,7 @@ BlockInputStreamPtr SortedBlocksWriter::streamFromFile(const TmpFilePtr & file)
 
 String SortedBlocksWriter::getPath() const
 {
-    return volume->getNextDisk()->getPath();
+    return volume->getDisk()->getPath();
 }
 
 

src/Interpreters/SortedBlocksWriter.h

@@ -16,8 +16,8 @@ class TableJoin;
 class MergeJoinCursor;
 struct MergeJoinEqualRange;
 
-class VolumeJBOD;
+class IVolume;
-using VolumeJBODPtr = std::shared_ptr<VolumeJBOD>;
+using VolumePtr = std::shared_ptr<IVolume>;
 
 struct SortedBlocksWriter
 {
@@ -63,7 +63,7 @@ struct SortedBlocksWriter
     std::mutex insert_mutex;
     std::condition_variable flush_condvar;
     const SizeLimits & size_limits;
-    VolumeJBODPtr volume;
+    VolumePtr volume;
     Block sample_block;
     const SortDescription & sort_description;
     Blocks inserted_blocks;
@@ -76,7 +76,7 @@ struct SortedBlocksWriter
     size_t flush_number = 0;
     size_t flush_inflight = 0;
 
-    SortedBlocksWriter(const SizeLimits & size_limits_, VolumeJBODPtr volume_, const Block & sample_block_,
+    SortedBlocksWriter(const SizeLimits & size_limits_, VolumePtr volume_, const Block & sample_block_,
                        const SortDescription & description, size_t rows_in_block_, size_t num_files_to_merge_, const String & codec_)
         : size_limits(size_limits_)
         , volume(volume_)

src/Interpreters/TableJoin.cpp

@@ -14,7 +14,7 @@
 namespace DB
 {
 
-TableJoin::TableJoin(const Settings & settings, VolumeJBODPtr tmp_volume_)
+TableJoin::TableJoin(const Settings & settings, VolumePtr tmp_volume_)
     : size_limits(SizeLimits{settings.max_rows_in_join, settings.max_bytes_in_join, settings.join_overflow_mode})
     , default_max_bytes(settings.default_max_bytes_in_join)
     , join_use_nulls(settings.join_use_nulls)

src/Interpreters/TableJoin.h

@@ -24,8 +24,8 @@ class DictionaryReader;
 
 struct Settings;
 
-class VolumeJBOD;
+class IVolume;
-using VolumeJBODPtr = std::shared_ptr<VolumeJBOD>;
+using VolumePtr = std::shared_ptr<IVolume>;
 
 class TableJoin
 {
@@ -71,11 +71,11 @@ class TableJoin
     /// Original name -> name. Only ranamed columns.
     std::unordered_map<String, String> renames;
 
-    VolumeJBODPtr tmp_volume;
+    VolumePtr tmp_volume;
 
 public:
     TableJoin() = default;
-    TableJoin(const Settings &, VolumeJBODPtr tmp_volume);
+    TableJoin(const Settings &, VolumePtr tmp_volume);
 
     /// for StorageJoin
     TableJoin(SizeLimits limits, bool use_nulls, ASTTableJoin::Kind kind, ASTTableJoin::Strictness strictness,
@@ -97,7 +97,7 @@ public:
     ASTTableJoin::Strictness strictness() const { return table_join.strictness; }
     bool sameStrictnessAndKind(ASTTableJoin::Strictness, ASTTableJoin::Kind) const;
     const SizeLimits & sizeLimits() const { return size_limits; }
-    VolumeJBODPtr getTemporaryVolume() { return tmp_volume; }
+    VolumePtr getTemporaryVolume() { return tmp_volume; }
     bool allowMergeJoin() const;
     bool allowDictJoin(const String & dict_key, const Block & sample_block, Names &, NamesAndTypesList &) const;
     bool preferMergeJoin() const { return join_algorithm == JoinAlgorithm::PREFER_PARTIAL_MERGE; }

src/Server/HTTPHandler.cpp

@@ -366,7 +366,7 @@ void HTTPHandler::processQuery(
 
         if (buffer_until_eof)
         {
-            const std::string tmp_path(context.getTemporaryVolume()->getNextDisk()->getPath());
+            const std::string tmp_path(context.getTemporaryVolume()->getDisk()->getPath());
             const std::string tmp_path_template(tmp_path + "http_buffers/");
 
             auto create_tmp_disk_buffer = [tmp_path_template] (const WriteBufferPtr &)

src/Storages/Distributed/DistributedBlockOutputStream.cpp

@@ -561,7 +561,9 @@ void DistributedBlockOutputStream::writeToShard(const Block & block, const std::
     /// and keep monitor thread out from reading incomplete data
     std::string first_file_tmp_path{};
 
-    const auto & [disk, data_path] = storage.getPath();
+    auto reservation = storage.getStoragePolicy()->reserve(block.bytes());
+    auto disk = reservation->getDisk()->getPath();
+    auto data_path = storage.getRelativeDataPath();
 
     auto it = dir_names.begin();
     /// on first iteration write block to a temporary directory for subsequent

src/Storages/StorageDistributed.cpp

@@ -290,7 +290,7 @@ StorageDistributed::StorageDistributed(
     const String & cluster_name_,
     const Context & context_,
     const ASTPtr & sharding_key_,
-    const String & storage_policy_,
+    const String & storage_policy_name_,
     const String & relative_data_path_,
     bool attach_)
     : IStorage(id_)
@@ -300,7 +300,6 @@ StorageDistributed::StorageDistributed(
     , log(&Poco::Logger::get("StorageDistributed (" + id_.table_name + ")"))
     , cluster_name(global_context->getMacros()->expand(cluster_name_))
     , has_sharding_key(sharding_key_)
-    , storage_policy(storage_policy_)
     , relative_data_path(relative_data_path_)
 {
     StorageInMemoryMetadata storage_metadata;
@@ -316,7 +315,11 @@ StorageDistributed::StorageDistributed(
     }
 
     if (!relative_data_path.empty())
-        createStorage();
+    {
+        storage_policy = global_context->getStoragePolicy(storage_policy_name_);
+        if (storage_policy->getVolumes().size() != 1)
+            throw Exception("Storage policy for Distributed table, should have exactly one volume", ErrorCodes::BAD_ARGUMENTS);
+    }
 
     /// Sanity check. Skip check if the table is already created to allow the server to start.
     if (!attach_ && !cluster_name.empty())
@@ -336,34 +339,14 @@ StorageDistributed::StorageDistributed(
     const String & cluster_name_,
     const Context & context_,
     const ASTPtr & sharding_key_,
-    const String & storage_policy_,
+    const String & storage_policy_name_,
     const String & relative_data_path_,
     bool attach)
-    : StorageDistributed(id_, columns_, constraints_, String{}, String{}, cluster_name_, context_, sharding_key_, storage_policy_, relative_data_path_, attach)
+    : StorageDistributed(id_, columns_, constraints_, String{}, String{}, cluster_name_, context_, sharding_key_, storage_policy_name_, relative_data_path_, attach)
 {
     remote_table_function_ptr = std::move(remote_table_function_ptr_);
 }
 
-void StorageDistributed::createStorage()
-{
-    /// Create default policy with the relative_data_path_
-    if (storage_policy.empty())
-    {
-        std::string path(global_context->getPath());
-        /// Disk must ends with '/'
-        if (!path.ends_with('/'))
-            path += '/';
-        auto disk = std::make_shared<DiskLocal>("default", path, 0);
-        volume = std::make_shared<VolumeJBOD>("default", std::vector<DiskPtr>{disk}, 0);
-    }
-    else
-    {
-        auto policy = global_context->getStoragePolicy(storage_policy);
-        if (policy->getVolumes().size() != 1)
-             throw Exception("Policy for Distributed table, should have exactly one volume", ErrorCodes::BAD_ARGUMENTS);
-        volume = policy->getVolume(0);
-    }
-}
 
 StoragePtr StorageDistributed::createWithOwnCluster(
     const StorageID & table_id_,
@@ -539,7 +522,7 @@ BlockOutputStreamPtr StorageDistributed::write(const ASTPtr &, const StorageMeta
     const auto & settings = context.getSettingsRef();
 
     /// Ban an attempt to make async insert into the table belonging to DatabaseMemory
-    if (!volume && !owned_cluster && !settings.insert_distributed_sync)
+    if (!storage_policy && !owned_cluster && !settings.insert_distributed_sync)
     {
         throw Exception("Storage " + getName() + " must has own data directory to enable asynchronous inserts",
                         ErrorCodes::BAD_ARGUMENTS);
@@ -595,10 +578,10 @@ void StorageDistributed::startup()
     if (remote_database.empty() && !remote_table_function_ptr)
         LOG_WARNING(log, "Name of remote database is empty. Default database will be used implicitly.");
 
-    if (!volume)
+    if (!storage_policy)
         return;
 
-    for (const DiskPtr & disk : volume->getDisks())
+    for (const DiskPtr & disk : storage_policy->getDisks())
         createDirectoryMonitors(disk->getPath());
 
     for (const String & path : getDataPaths())
@@ -632,7 +615,7 @@ void StorageDistributed::drop()
 
     LOG_DEBUG(log, "Removing pending blocks for async INSERT from filesystem on DROP TABLE");
 
-    auto disks = volume->getDisks();
+    auto disks = storage_policy->getDisks();
     for (const auto & disk : disks)
         disk->removeRecursive(relative_data_path);
 
@@ -646,7 +629,7 @@ Strings StorageDistributed::getDataPaths() const
     if (relative_data_path.empty())
         return paths;
 
-    for (const DiskPtr & disk : volume->getDisks())
+    for (const DiskPtr & disk : storage_policy->getDisks())
         paths.push_back(disk->getPath() + relative_data_path);
 
     return paths;
@@ -669,9 +652,7 @@ void StorageDistributed::truncate(const ASTPtr &, const StorageMetadataPtr &, co
 
 StoragePolicyPtr StorageDistributed::getStoragePolicy() const
 {
-    if (storage_policy.empty())
+    return storage_policy;
-        return {};
-    return global_context->getStoragePolicy(storage_policy);
 }
 
 void StorageDistributed::createDirectoryMonitors(const std::string & disk)
@@ -718,11 +699,6 @@ size_t StorageDistributed::getShardCount() const
     return getCluster()->getShardCount();
 }
 
-std::pair<const std::string &, const std::string &> StorageDistributed::getPath()
-{
-    return {volume->getNextDisk()->getPath(), relative_data_path};
-}
-
 ClusterPtr StorageDistributed::getCluster() const
 {
     return owned_cluster ? owned_cluster : global_context->getCluster(cluster_name);
@@ -868,9 +844,11 @@ void StorageDistributed::rename(const String & new_path_to_table_data, const Sto
         renameOnDisk(new_path_to_table_data);
     renameInMemory(new_table_id);
 }
+
+
 void StorageDistributed::renameOnDisk(const String & new_path_to_table_data)
 {
-    for (const DiskPtr & disk : volume->getDisks())
+    for (const DiskPtr & disk : storage_policy->getDisks())
     {
         const String path(disk->getPath());
         auto new_path = path + new_path_to_table_data;
@@ -925,7 +903,7 @@ void registerStorageDistributed(StorageFactory & factory)
         String remote_table = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
 
         const auto & sharding_key = engine_args.size() >= 4 ? engine_args[3] : nullptr;
-        const auto & storage_policy = engine_args.size() >= 5 ? engine_args[4]->as<ASTLiteral &>().value.safeGet<String>() : "";
+        const auto & storage_policy = engine_args.size() >= 5 ? engine_args[4]->as<ASTLiteral &>().value.safeGet<String>() : "default";
 
         /// Check that sharding_key exists in the table and has numeric type.
         if (sharding_key)

src/Storages/StorageDistributed.h

@@ -18,8 +18,8 @@ namespace DB
 struct Settings;
 class Context;
 
-class VolumeJBOD;
+class IVolume;
-using VolumeJBODPtr = std::shared_ptr<VolumeJBOD>;
+using VolumePtr = std::shared_ptr<IVolume>;
 
 class ExpressionActions;
 using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
@@ -102,7 +102,7 @@ public:
     const ExpressionActionsPtr & getShardingKeyExpr() const { return sharding_key_expr; }
     const String & getShardingKeyColumnName() const { return sharding_key_column_name; }
     size_t getShardCount() const;
-    std::pair<const std::string &, const std::string &> getPath();
+    const String & getRelativeDataPath() const { return relative_data_path; }
     std::string getRemoteDatabaseName() const { return remote_database; }
     std::string getRemoteTableName() const { return remote_table; }
     std::string getClusterName() const { return cluster_name; } /// Returns empty string if tables is used by TableFunctionRemote
@@ -163,7 +163,7 @@ protected:
         const String & cluster_name_,
         const Context & context_,
         const ASTPtr & sharding_key_,
-        const String & storage_policy_,
+        const String & storage_policy_name_,
         const String & relative_data_path_,
         bool attach_);
 
@@ -175,16 +175,14 @@ protected:
         const String & cluster_name_,
         const Context & context_,
         const ASTPtr & sharding_key_,
-        const String & storage_policy_,
+        const String & storage_policy_name_,
         const String & relative_data_path_,
         bool attach);
 
-    void createStorage();
-
-    String storage_policy;
     String relative_data_path;
+
     /// Can be empty if relative_data_path is empty. In this case, a directory for the data to be sent is not created.
-    VolumeJBODPtr volume;
+    StoragePolicyPtr storage_policy;
 
     struct ClusterNodeData
     {

src/Storages/System/StorageSystemStoragePolicies.cpp

@@ -1,7 +1,10 @@
-#include <Columns/ColumnArray.h>
-#include <DataStreams/OneBlockInputStream.h>
 #include <Storages/System/StorageSystemStoragePolicies.h>
+
+#include <Columns/ColumnArray.h>
+#include <Columns/ColumnNullable.h>
+#include <DataStreams/OneBlockInputStream.h>
 #include <DataTypes/DataTypeArray.h>
+#include <DataTypes/DataTypeNullable.h>
 #include <Processors/Sources/SourceFromSingleChunk.h>
 #include <Interpreters/Context.h>
 
@@ -24,9 +27,11 @@ StorageSystemStoragePolicies::StorageSystemStoragePolicies(const std::string & n
              {"volume_name", std::make_shared<DataTypeString>()},
              {"volume_priority", std::make_shared<DataTypeUInt64>()},
              {"disks", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
-             {"max_data_part_size", std::make_shared<DataTypeUInt64>()},
+             {"volume_type", std::make_shared<DataTypeString>()},
-             {"move_factor", std::make_shared<DataTypeFloat32>()}
+             {"max_data_part_size", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeUInt64>())},
+             {"move_factor", std::make_shared<DataTypeFloat32>()},
     }));
+    // TODO: Add string column with custom volume-type-specific options
     setInMemoryMetadata(storage_metadata);
 }
 
@@ -45,7 +50,8 @@ Pipes StorageSystemStoragePolicies::read(
     MutableColumnPtr col_volume_name = ColumnString::create();
     MutableColumnPtr col_priority = ColumnUInt64::create();
     MutableColumnPtr col_disks = ColumnArray::create(ColumnString::create());
-    MutableColumnPtr col_max_part_size = ColumnUInt64::create();
+    MutableColumnPtr col_volume_type = ColumnString::create();
+    MutableColumnPtr col_max_part_size = ColumnNullable::create(ColumnUInt64::create(), ColumnUInt8::create());
     MutableColumnPtr col_move_factor = ColumnFloat32::create();
 
     for (const auto & [policy_name, policy_ptr] : context.getPoliciesMap())
@@ -61,7 +67,12 @@ Pipes StorageSystemStoragePolicies::read(
             for (const auto & disk_ptr : volumes[i]->getDisks())
                 disks.push_back(disk_ptr->getName());
             col_disks->insert(disks);
-            col_max_part_size->insert(volumes[i]->max_data_part_size);
+            col_volume_type->insert(volumeTypeToString(volumes[i]->getType()));
+            auto volume_jbod = std::dynamic_pointer_cast<VolumeJBOD>(volumes[i]);
+            if (volume_jbod)
+                col_max_part_size->insert(volume_jbod->max_data_part_size);
+            else
+                col_max_part_size->insert(Null{});
             col_move_factor->insert(policy_ptr->getMoveFactor());
         }
     }
@@ -71,6 +82,7 @@ Pipes StorageSystemStoragePolicies::read(
     res_columns.emplace_back(std::move(col_volume_name));
     res_columns.emplace_back(std::move(col_priority));
     res_columns.emplace_back(std::move(col_disks));
+    res_columns.emplace_back(std::move(col_volume_type));
     res_columns.emplace_back(std::move(col_max_part_size));
     res_columns.emplace_back(std::move(col_move_factor));
 

tests/integration/test_multiple_disks/test.py

@@ -73,6 +73,7 @@ def test_system_tables(start_cluster):
             "volume_name": "main",
             "volume_priority": "1",
             "disks": ["jbod1"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.1,
         },
@@ -81,6 +82,7 @@ def test_system_tables(start_cluster):
             "volume_name": "external",
             "volume_priority": "2",
             "disks": ["external"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.1,
         },
@@ -89,6 +91,7 @@ def test_system_tables(start_cluster):
             "volume_name": "m",
             "volume_priority": "1",
             "disks": ["jbod1"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.1,
         },
@@ -97,6 +100,7 @@ def test_system_tables(start_cluster):
             "volume_name": "e",
             "volume_priority": "2",
             "disks": ["external"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.1,
         },
@@ -105,6 +109,7 @@ def test_system_tables(start_cluster):
             "volume_name": "main",
             "volume_priority": "1",
             "disks": ["jbod1", "jbod2"],
+            "volume_type": "JBOD",
             "max_data_part_size": "10485760",
             "move_factor": 0.1,
         },
@@ -113,6 +118,7 @@ def test_system_tables(start_cluster):
             "volume_name": "external",
             "volume_priority": "2",
             "disks": ["external"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.1,
         },
@@ -121,6 +127,7 @@ def test_system_tables(start_cluster):
             "volume_name": "main",
             "volume_priority": "1",
             "disks": ["jbod1"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.7,
         },
@@ -129,6 +136,7 @@ def test_system_tables(start_cluster):
             "volume_name": "external",
             "volume_priority": "2",
             "disks": ["external"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.7,
         },
@@ -137,6 +145,7 @@ def test_system_tables(start_cluster):
             "volume_name": "small",
             "volume_priority": "1",
             "disks": ["default"],
+            "volume_type": "JBOD",
             "max_data_part_size": "2097152",
             "move_factor": 0.1,
         },
@@ -145,6 +154,7 @@ def test_system_tables(start_cluster):
             "volume_name": "big",
             "volume_priority": "2",
             "disks": ["external"],
+            "volume_type": "JBOD",
             "max_data_part_size": "20971520",
             "move_factor": 0.1,
         },
@@ -153,6 +163,7 @@ def test_system_tables(start_cluster):
             "volume_name": "special_warning_zero_volume",
             "volume_priority": "1",
             "disks": ["default"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.1,
         },
@@ -161,6 +172,7 @@ def test_system_tables(start_cluster):
             "volume_name": "special_warning_default_volume",
             "volume_priority": "2",
             "disks": ["external"],
+            "volume_type": "JBOD",
             "max_data_part_size": "0",
             "move_factor": 0.1,
         },
@@ -169,6 +181,7 @@ def test_system_tables(start_cluster):
             "volume_name": "special_warning_small_volume",
             "volume_priority": "3",
             "disks": ["jbod1"],
+            "volume_type": "JBOD",
             "max_data_part_size": "1024",
             "move_factor": 0.1,
         },
@@ -177,6 +190,7 @@ def test_system_tables(start_cluster):
             "volume_name": "special_warning_big_volume",
             "volume_priority": "4",
             "disks": ["jbod2"],
+            "volume_type": "JBOD",
             "max_data_part_size": "1024000000",
             "move_factor": 0.1,
         },