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add prefetch for hive text

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This commit is contained in:
taiyang-li 2022-05-26 11:04:35 +08:00
parent a7a816dcb6
commit 561c87222d
3 changed files with 11 additions and 0 deletions
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7
src/Storages/HDFS/AsynchronousReadBufferFromHDFS.cpp
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@ -42,9 +42,12 @@ AsynchronousReadBufferFromHDFS::AsynchronousReadBufferFromHDFS(
, impl(std::move(impl_))
, prefetch_buffer(settings_.remote_fs_buffer_size)
, read_until_position(impl->getFileSize())
, use_prefetch(settings_.remote_fs_prefetch)
, log(&Poco::Logger::get("AsynchronousReadBufferFromHDFS"))
{
ProfileEvents::increment(ProfileEvents::RemoteFSBuffers);
if (use_prefetch)
prefetch();
}
bool AsynchronousReadBufferFromHDFS::hasPendingDataToRead()
@ -142,6 +145,10 @@ bool AsynchronousReadBufferFromHDFS::nextImpl()
file_offset_of_buffer_end = impl->getFileOffsetOfBufferEnd();
prefetch_future = {};
if (use_prefetch)
prefetch();
return size;
}

1
src/Storages/HDFS/AsynchronousReadBufferFromHDFS.h
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@ -57,6 +57,7 @@ private:
size_t file_offset_of_buffer_end = 0;
std::optional<size_t> read_until_position;
bool use_prefetch;
Poco::Logger * log;
};

3
src/Storages/Hive/StorageHive.cpp
View File

@ -133,6 +133,9 @@ public:
if (to_read_block.has(name_type.name))
to_read_block.erase(name_type.name);
}
/// Apply read buffer prefetch for HiveText format, because it is read sequentially
read_settings.remote_fs_prefetch = format == "HiveText";
}
FormatSettings updateFormatSettings(const HiveFilePtr & hive_file)