Split StorageKafka.cpp on smaller files per class

dbms/src/Storages/Kafka/KafkaBlockInputStream.cpp

@@ -0,0 +1,101 @@
+#include <Storages/Kafka/KafkaBlockInputStream.h>
+
+#include <Formats/FormatFactory.h>
+#include <Storages/Kafka/StorageKafka.h>
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int TIMEOUT_EXCEEDED;
+} // namespace ErrorCodes
+
+KafkaBlockInputStream::KafkaBlockInputStream(
+    StorageKafka & storage_, const Context & context_, const String & schema, size_t max_block_size_)
+    : storage(storage_), context(context_), max_block_size(max_block_size_)
+{
+    // Always skip unknown fields regardless of the context (JSON or TSKV)
+    context.setSetting("input_format_skip_unknown_fields", 1u);
+
+    // We don't use ratio since the number of Kafka messages may vary from stream to stream.
+    // Thus, ratio is meaningless.
+    context.setSetting("input_format_allow_errors_ratio", 1.);
+    context.setSetting("input_format_allow_errors_num", storage.skip_broken);
+
+    if (schema.size() > 0)
+        context.setSetting("format_schema", schema);
+}
+
+KafkaBlockInputStream::~KafkaBlockInputStream()
+{
+    if (!hasClaimed())
+        return;
+
+    // An error was thrown during the stream or it did not finish successfully
+    // The read offsets weren't comitted, so consumer must rejoin the group from the original starting point
+    if (!finalized)
+    {
+        LOG_TRACE(storage.log, "KafkaBlockInputStream did not finish successfully, unsubscribing from assignments and rejoining");
+        consumer->unsubscribe();
+        consumer->subscribe(storage.topics);
+    }
+
+    // Return consumer for another reader
+    storage.pushConsumer(consumer);
+    consumer = nullptr;
+}
+
+String KafkaBlockInputStream::getName() const
+{
+    return storage.getName();
+}
+
+Block KafkaBlockInputStream::readImpl()
+{
+    if (isCancelledOrThrowIfKilled() || !hasClaimed())
+        return {};
+
+    if (!reader)
+        throw Exception("Logical error: reader is not initialized", ErrorCodes::LOGICAL_ERROR);
+
+    return reader->read();
+}
+
+Block KafkaBlockInputStream::getHeader() const
+{
+    return storage.getSampleBlock();
+}
+
+void KafkaBlockInputStream::readPrefixImpl()
+{
+    if (!hasClaimed())
+    {
+        // Create a formatted reader on Kafka messages
+        LOG_TRACE(storage.log, "Creating formatted reader");
+        consumer = storage.tryClaimConsumer(context.getSettingsRef().queue_max_wait_ms.totalMilliseconds());
+        if (consumer == nullptr)
+            throw Exception("Failed to claim consumer: ", ErrorCodes::TIMEOUT_EXCEEDED);
+
+        read_buf = std::make_unique<ReadBufferFromKafkaConsumer>(consumer, storage.log, storage.row_delimiter);
+        reader = FormatFactory::instance().getInput(storage.format_name, *read_buf, storage.getSampleBlock(), context, max_block_size);
+    }
+
+    // Start reading data
+    finalized = false;
+    reader->readPrefix();
+}
+
+void KafkaBlockInputStream::readSuffixImpl()
+{
+    if (hasClaimed())
+    {
+        reader->readSuffix();
+        // Store offsets read in this stream
+        read_buf->commit();
+    }
+
+    // Mark as successfully finished
+    finalized = true;
+}
+
+} // namespace DB

dbms/src/Storages/Kafka/KafkaBlockInputStream.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <DataStreams/IProfilingBlockInputStream.h>
+#include <Interpreters/Context.h>
+#include <Storages/Kafka/ReadBufferFromKafkaConsumer.h>
+
+namespace DB
+{
+class StorageKafka;
+
+class KafkaBlockInputStream : public IProfilingBlockInputStream
+{
+public:
+    KafkaBlockInputStream(StorageKafka & storage_, const Context & context_, const String & schema, size_t max_block_size_);
+    ~KafkaBlockInputStream() override;
+
+    String getName() const override;
+    Block readImpl() override;
+    Block getHeader() const override;
+    void readPrefixImpl() override;
+    void readSuffixImpl() override;
+
+private:
+    StorageKafka & storage;
+    ConsumerPtr consumer;
+    Context context;
+    size_t max_block_size;
+    Block sample_block;
+    std::unique_ptr<ReadBufferFromKafkaConsumer> read_buf;
+    BlockInputStreamPtr reader;
+    bool finalized = false;
+
+    // Return true if consumer has been claimed by the stream
+    bool hasClaimed() { return consumer != nullptr; }
+};
+
+} // namespace DB

dbms/src/Storages/Kafka/ReadBufferFromKafkaConsumer.cpp

@@ -0,0 +1,62 @@
+#include <Storages/Kafka/ReadBufferFromKafkaConsumer.h>
+
+namespace DB
+{
+
+namespace
+{
+    /// How long to wait for a single message (applies to each individual message)
+    const auto READ_POLL_MS = 500;
+} // namespace
+
+bool ReadBufferFromKafkaConsumer::nextImpl()
+{
+    if (current_pending)
+    {
+        // XXX: very fishy place with const casting.
+        BufferBase::set(
+            reinterpret_cast<char *>(const_cast<unsigned char *>(current.get_payload().get_data())), current.get_payload().get_size(), 0);
+        current_pending = false;
+        return true;
+    }
+
+    // Process next buffered message
+    auto message = consumer->poll(std::chrono::milliseconds(READ_POLL_MS));
+    if (!message)
+        return false;
+
+    if (message.is_eof())
+    {
+        // Reached EOF while reading current batch, skip it.
+        LOG_TRACE(log, "EOF reached for partition " << message.get_partition() << " offset " << message.get_offset());
+        return nextImpl();
+    }
+    else if (auto err = message.get_error())
+    {
+        LOG_ERROR(log, "Consumer error: " << err);
+        return false;
+    }
+
+    ++read_messages;
+
+    // Now we've received a new message. Check if we need to produce a delimiter
+    if (row_delimiter != '\0' && current)
+    {
+        BufferBase::set(&row_delimiter, 1, 0);
+        current = std::move(message);
+        current_pending = true;
+        return true;
+    }
+
+    // Consume message and mark the topic/partition offset
+    // The offsets will be committed in the readSuffix() method after the block is completed
+    // If an exception is thrown before that would occur, the client will rejoin without committing offsets
+    current = std::move(message);
+
+    // XXX: very fishy place with const casting.
+    BufferBase::set(
+        reinterpret_cast<char *>(const_cast<unsigned char *>(current.get_payload().get_data())), current.get_payload().get_size(), 0);
+    return true;
+}
+
+} // namespace DB

dbms/src/Storages/Kafka/ReadBufferFromKafkaConsumer.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <IO/ReadBuffer.h>
+#include <common/logger_useful.h>
+
+#include <cppkafka/cppkafka.h>
+
+namespace DB
+{
+using ConsumerPtr = std::shared_ptr<cppkafka::Consumer>;
+
+class ReadBufferFromKafkaConsumer : public ReadBuffer
+{
+public:
+    ReadBufferFromKafkaConsumer(ConsumerPtr consumer_, Poco::Logger * log_, char row_delimiter_)
+        : ReadBuffer(nullptr, 0), consumer(consumer_), log(log_), row_delimiter(row_delimiter_)
+    {
+        if (row_delimiter != '\0')
+            LOG_TRACE(log, "Row delimiter is: " << row_delimiter);
+    }
+
+    /// Commit messages read with this consumer
+    void commit()
+    {
+        LOG_TRACE(log, "Committing " << read_messages << " messages");
+        if (read_messages == 0)
+            return;
+
+        consumer->async_commit();
+        read_messages = 0;
+    }
+
+private:
+    ConsumerPtr consumer;
+    cppkafka::Message current;
+    bool current_pending = false; /// We've fetched "current" message and need to process it on the next iteration.
+    Poco::Logger * log;
+    size_t read_messages = 0;
+    char row_delimiter;
+
+    bool nextImpl() override;
+};
+
+} // namespace DB

dbms/src/Storages/Kafka/StorageKafka.cpp

@@ -6,9 +6,6 @@
 #include <DataStreams/LimitBlockInputStream.h>
 #include <DataStreams/UnionBlockInputStream.h>
 #include <DataStreams/copyData.h>
-#include <Formats/FormatFactory.h>
-#include <IO/ReadBuffer.h>
-#include <Interpreters/Context.h>
 #include <Interpreters/InterpreterInsertQuery.h>
 #include <Interpreters/evaluateConstantExpression.h>
 #include <Parsers/ASTCreateQuery.h>
@@ -16,6 +13,7 @@
 #include <Parsers/ASTInsertQuery.h>
 #include <Parsers/ASTLiteral.h>
 #include <Storages/Kafka/KafkaSettings.h>
+#include <Storages/Kafka/KafkaBlockInputStream.h>
 #include <Storages/StorageFactory.h>
 #include <Storages/StorageMaterializedView.h>
 #include <boost/algorithm/string/replace.hpp>
@@ -42,199 +40,19 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
     extern const int BAD_ARGUMENTS;
     extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
-    extern const int TIMEOUT_EXCEEDED;
 }
 
-using namespace Poco::Util;
-
-/// How long to wait for a single message (applies to each individual message)
-static const auto READ_POLL_MS       = 500;
-static const auto CLEANUP_TIMEOUT_MS = 3000;
+namespace
+{
+    const auto RESCHEDULE_MS = 500;
+    const auto CLEANUP_TIMEOUT_MS = 3000;
 
     /// Configuration prefix
-static const String CONFIG_PREFIX = "kafka";
+    const String CONFIG_PREFIX = "kafka";
 
-class ReadBufferFromKafkaConsumer : public ReadBuffer
+    void loadFromConfig(cppkafka::Configuration & conf, const Poco::Util::AbstractConfiguration & config, const std::string & path)
     {
-    ConsumerPtr consumer;
-    cppkafka::Message current;
-    bool current_pending = false;   /// We've fetched "current" message and need to process it on the next iteration.
-    Poco::Logger * log;
-    size_t read_messages = 0;
-    char row_delimiter;
-
-    bool nextImpl() override
-    {
-        if (current_pending)
-        {
-            // XXX: very fishy place with const casting.
-            BufferBase::set(reinterpret_cast<char *>(const_cast<unsigned char *>(current.get_payload().get_data())), current.get_payload().get_size(), 0);
-            current_pending = false;
-            return true;
-        }
-
-        // Process next buffered message
-        auto message = consumer->poll(std::chrono::milliseconds(READ_POLL_MS));
-        if (!message)
-            return false;
-
-        if (message.is_eof())
-        {
-            // Reached EOF while reading current batch, skip it.
-            LOG_TRACE(log, "EOF reached for partition " << message.get_partition() << " offset " << message.get_offset());
-            return nextImpl();
-        }
-        else if (auto err = message.get_error())
-        {
-            LOG_ERROR(log, "Consumer error: " << err);
-            return false;
-        }
-
-        ++read_messages;
-
-        // Now we've received a new message. Check if we need to produce a delimiter
-        if (row_delimiter != '\0' && current)
-        {
-            BufferBase::set(&row_delimiter, 1, 0);
-            current = std::move(message);
-            current_pending = true;
-            return true;
-        }
-
-        // Consume message and mark the topic/partition offset
-        // The offsets will be committed in the readSuffix() method after the block is completed
-        // If an exception is thrown before that would occur, the client will rejoin without committing offsets
-        current = std::move(message);
-
-        // XXX: very fishy place with const casting.
-        BufferBase::set(reinterpret_cast<char *>(const_cast<unsigned char *>(current.get_payload().get_data())), current.get_payload().get_size(), 0);
-        return true;
-    }
-
-public:
-    ReadBufferFromKafkaConsumer(ConsumerPtr consumer_, Poco::Logger * log_, char row_delimiter_)
-        : ReadBuffer(nullptr, 0), consumer(consumer_), log(log_), row_delimiter(row_delimiter_)
-    {
-        if (row_delimiter != '\0')
-            LOG_TRACE(log, "Row delimiter is: " << row_delimiter);
-    }
-
-    /// Commit messages read with this consumer
-    void commit()
-    {
-        LOG_TRACE(log, "Committing " << read_messages << " messages");
-        if (read_messages == 0)
-            return;
-
-        consumer->async_commit();
-        read_messages = 0;
-    }
-};
-
-class KafkaBlockInputStream : public IBlockInputStream
-{
-public:
-    KafkaBlockInputStream(StorageKafka & storage_, const Context & context_, const String & schema, size_t max_block_size_)
-        : storage(storage_), context(context_), max_block_size(max_block_size_)
-    {
-        // Always skip unknown fields regardless of the context (JSON or TSKV)
-        context.setSetting("input_format_skip_unknown_fields", 1u);
-
-        // We don't use ratio since the number of Kafka messages may vary from stream to stream.
-        // Thus, ratio is meaningless.
-        context.setSetting("input_format_allow_errors_ratio", 1.);
-        context.setSetting("input_format_allow_errors_num", storage.skip_broken);
-
-        if (schema.size() > 0)
-            context.setSetting("format_schema", schema);
-    }
-
-    ~KafkaBlockInputStream() override
-    {
-        if (!hasClaimed())
-            return;
-
-        // An error was thrown during the stream or it did not finish successfully
-        // The read offsets weren't committed, so consumer must rejoin the group from the original starting point
-        if (!finalized)
-        {
-            LOG_TRACE(storage.log, "KafkaBlockInputStream did not finish successfully, unsubscribing from assignments and rejoining");
-            consumer->unsubscribe();
-            consumer->subscribe(storage.topics);
-        }
-
-        // Return consumer for another reader
-        storage.pushConsumer(consumer);
-        consumer = nullptr;
-    }
-
-    String getName() const override
-    {
-        return storage.getName();
-    }
-
-    Block readImpl() override
-    {
-        if (isCancelledOrThrowIfKilled() || !hasClaimed())
-            return {};
-
-        if (!reader)
-            throw Exception("Logical error: reader is not initialized", ErrorCodes::LOGICAL_ERROR);
-
-        return reader->read();
-    }
-
-    Block getHeader() const override { return storage.getSampleBlock(); }
-
-    void readPrefixImpl() override
-    {
-        if (!hasClaimed())
-        {
-            // Create a formatted reader on Kafka messages
-            LOG_TRACE(storage.log, "Creating formatted reader");
-            consumer = storage.tryClaimConsumer(context.getSettingsRef().queue_max_wait_ms.totalMilliseconds());
-            if (consumer == nullptr)
-                throw Exception("Failed to claim consumer: ", ErrorCodes::TIMEOUT_EXCEEDED);
-
-            read_buf = std::make_unique<ReadBufferFromKafkaConsumer>(consumer, storage.log, storage.row_delimiter);
-            reader = FormatFactory::instance().getInput(storage.format_name, *read_buf, storage.getSampleBlock(), context, max_block_size);
-        }
-
-        // Start reading data
-        finalized = false;
-        reader->readPrefix();
-    }
-
-    void readSuffixImpl() override
-    {
-        if (hasClaimed())
-        {
-            reader->readSuffix();
-            // Store offsets read in this stream
-            read_buf->commit();
-        }
-
-        // Mark as successfully finished
-        finalized = true;
-    }
-
-private:
-    StorageKafka & storage;
-    ConsumerPtr consumer;
-    Context context;
-    size_t max_block_size;
-    Block sample_block;
-    std::unique_ptr<ReadBufferFromKafkaConsumer> read_buf;
-    BlockInputStreamPtr reader;
-    bool finalized = false;
-
-    // Return true if consumer has been claimed by the stream
-    bool hasClaimed() { return consumer != nullptr; }
-};
-
-static void loadFromConfig(cppkafka::Configuration & conf, const AbstractConfiguration & config, const std::string & path)
-{
-    AbstractConfiguration::Keys keys;
+        Poco::Util::AbstractConfiguration::Keys keys;
         std::vector<char> errstr(512);
 
         config.keys(path, keys);
@@ -246,6 +64,7 @@ static void loadFromConfig(cppkafka::Configuration & conf, const AbstractConfigu
             conf.set(key_name, config.getString(key_path));
         }
     }
+} // namespace
 
 StorageKafka::StorageKafka(
     const std::string & table_name_,
@@ -361,6 +180,9 @@ cppkafka::Configuration StorageKafka::createConsumerConfiguration()
     // We manually commit offsets after a stream successfully finished
     conf.set("enable.auto.commit", "false");
 
+    // for debug logs inside rdkafka
+    conf.set("debug", "consumer,cgrp,topic,fetch");
+
     // Update consumer configuration from the configuration
     const auto & config = global_context.getConfigRef();
     if (config.has(CONFIG_PREFIX))
@@ -461,7 +283,7 @@ void StorageKafka::streamThread()
 
     // Wait for attached views
     if (!stream_cancelled)
-        task->scheduleAfter(READ_POLL_MS);
+        task->scheduleAfter(RESCHEDULE_MS);
 }