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108 lines
4.0 KiB
C++
108 lines
4.0 KiB
C++
#pragma once
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#include <Common/Exception.h>
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#include <Core/Types.h>
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#include <IO/WriteHelpers.h>
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#include <mutex>
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#include <condition_variable>
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struct Stat;
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namespace DB
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{
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class ReadBuffer;
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class WriteBuffer;
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class ReplicatedMergeTreeQueue;
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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extern const int UNKNOWN_FORMAT_VERSION;
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extern const int CANNOT_PARSE_TEXT;
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}
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/// Record about what needs to be done. Only data (you can copy them).
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struct ReplicatedMergeTreeLogEntryData
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{
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enum Type
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{
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EMPTY, /// Not used.
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GET_PART, /// Get the part from another replica.
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MERGE_PARTS, /// Merge the parts.
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DROP_RANGE, /// Delete the parts in the specified partition in the specified number range.
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ATTACH_PART, /// Move a part from the `detached` directory. Obsolete. TODO: Remove after half year.
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CLEAR_COLUMN, /// Drop specific column from specified partition.
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};
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String typeToString() const
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{
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switch (type)
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{
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case ReplicatedMergeTreeLogEntryData::GET_PART: return "GET_PART";
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case ReplicatedMergeTreeLogEntryData::MERGE_PARTS: return "MERGE_PARTS";
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case ReplicatedMergeTreeLogEntryData::DROP_RANGE: return "DROP_RANGE";
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case ReplicatedMergeTreeLogEntryData::ATTACH_PART: return "ATTACH_PART";
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case ReplicatedMergeTreeLogEntryData::CLEAR_COLUMN: return "CLEAR_COLUMN";
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default:
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throw Exception("Unknown log entry type: " + DB::toString<int>(type), ErrorCodes::LOGICAL_ERROR);
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}
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}
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void writeText(WriteBuffer & out) const;
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void readText(ReadBuffer & in);
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String toString() const;
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String znode_name;
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Type type = EMPTY;
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String source_replica; /// Empty string means that this entry was added to the queue immediately, and not copied from the log.
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/// The name of resulting part.
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/// For DROP_RANGE, the name of a non-existent part. You need to remove all the parts covered by it.
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String new_part_name;
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String block_id; /// For parts of level zero, the block identifier for deduplication (node name in /blocks/).
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mutable String actual_new_part_name; /// GET_PART could actually fetch a part covering 'new_part_name'.
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Strings parts_to_merge;
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bool deduplicate = false; /// Do deduplicate on merge
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String column_name;
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/// For DROP_RANGE, true means that the parts need not be deleted, but moved to the `detached` directory.
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bool detach = false;
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/// Access under queue_mutex, see ReplicatedMergeTreeQueue.
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bool currently_executing = false; /// Whether the action is executing now.
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/// These several fields are informational only (for viewing by the user using system tables).
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/// Access under queue_mutex, see ReplicatedMergeTreeQueue.
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size_t num_tries = 0; /// The number of attempts to perform the action (since the server started, including the running one).
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std::exception_ptr exception; /// The last exception, in the case of an unsuccessful attempt to perform the action.
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time_t last_attempt_time = 0; /// The time at which the last attempt was attempted to complete the action.
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size_t num_postponed = 0; /// The number of times the action was postponed.
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String postpone_reason; /// The reason why the action was postponed, if it was postponed.
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time_t last_postpone_time = 0; /// The time of the last time the action was postponed.
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/// Creation time or the time to copy from the general log to the queue of a particular replica.
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time_t create_time = 0;
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/// The quorum value (for GET_PART) is a non-zero value when the quorum write is enabled.
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size_t quorum = 0;
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};
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struct ReplicatedMergeTreeLogEntry : ReplicatedMergeTreeLogEntryData
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{
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using Ptr = std::shared_ptr<ReplicatedMergeTreeLogEntry>;
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std::condition_variable execution_complete; /// Awake when currently_executing becomes false.
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static Ptr parse(const String & s, const Stat & stat);
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};
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}
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