[fix](file cache) Fix slow IO for table stats procedure, introduced by #37141#39123
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gavinchou merged 1 commit intoapache:masterfrom Aug 9, 2024
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…apache#37141 Session variable `disable_file_cache` is processed as "disposable file cache" in beta_rowset_reader.cpp. ``` if (_read_context->runtime_state != nullptr) { _read_options.io_ctx.query_id = &_read_context->runtime_state->query_id(); _read_options.io_ctx.read_file_cache = _read_context->runtime_state->query_options().enable_file_cache; _read_options.io_ctx.is_disposable = _read_context->runtime_state->query_options().disable_file_cache; } ``` We use disposable cache to avoid IO amp and avoid large amount of eviction from the cached data ("normal cache"). We cannot set the read option cache policy to "no cache" because it may cause IO amp: every page IO will cause a remote IO, which is a performance disaster.
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Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
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clang-tidy review says "All clean, LGTM! 👍" |
TPC-H: Total hot run time: 40082 ms |
TPC-H: Total hot run time: 39522 ms |
TPC-DS: Total hot run time: 203781 ms |
ClickBench: Total hot run time: 31.35 s |
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PR approved by anyone and no changes requested. |
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Yukang-Lian
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Aug 9, 2024
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Aug 14, 2024
…apache#37141 (apache#39123) Session variable `disable_file_cache` is processed as "disposable file cache" in beta_rowset_reader.cpp. ``` if (_read_context->runtime_state != nullptr) { _read_options.io_ctx.query_id = &_read_context->runtime_state->query_id(); _read_options.io_ctx.read_file_cache = _read_context->runtime_state->query_options().enable_file_cache; _read_options.io_ctx.is_disposable = _read_context->runtime_state->query_options().disable_file_cache; } ``` We use disposable cache to avoid IO amp and avoid large amount of eviction from the cached data ("normal cache"). We cannot set the read option cache policy to "no cache" because it may cause IO amp: every page IO will cause a remote IO, which is a performance disaster.
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Aug 16, 2024
…#37141 (#39123) Session variable `disable_file_cache` is processed as "disposable file cache" in beta_rowset_reader.cpp. ``` if (_read_context->runtime_state != nullptr) { _read_options.io_ctx.query_id = &_read_context->runtime_state->query_id(); _read_options.io_ctx.read_file_cache = _read_context->runtime_state->query_options().enable_file_cache; _read_options.io_ctx.is_disposable = _read_context->runtime_state->query_options().disable_file_cache; } ``` We use disposable cache to avoid IO amp and avoid large amount of eviction from the cached data ("normal cache"). We cannot set the read option cache policy to "no cache" because it may cause IO amp: every page IO will cause a remote IO, which is a performance disaster.
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Session variable
disable_file_cacheis processed as "disposable file cache" in beta_rowset_reader.cpp.We use disposable cache to avoid IO amp and avoid large amount of eviction from the cached data ("normal cache").
We cannot set the read option cache policy to "no cache" because it may cause IO amp: every page IO will cause a remote IO, which is a performance disaster.