Fix max granules size in MergeTreeDataWriter #19123
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robot-clickhouse
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Ok, I know how to fix it now, but the error caused by the code complexity.... It's sad. |
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alesapin
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Jan 15, 2021
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| client.query("SYSTEM STOP MERGES t") | ||
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| # These blocks size taken from the real table which reproduces the error |
alesapin
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alesapin
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Jan 15, 2021
| void MergeTreeDataPartWriterWide::adjustLastMarkIfNeedAndFlushToDisk(size_t new_rows_in_last_mark) | ||
| { | ||
| /// We don't want to split already written granules to smaller | ||
| if (rows_written_in_last_mark > new_rows_in_last_mark) |
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Additional self-check. We have quite a lot of them, but I think it's better than possible data corruption.
alesapin
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Jan 15, 2021
| else /// We still can write some rows from new block into previous granule. | ||
| adjustLastMarkIfNeedAndFlushToDisk(index_granularity_for_block - rows_written_in_last_mark); | ||
| else /// We still can write some rows from new block into previous granule. So the granule size will be block granularity size. | ||
| adjustLastMarkIfNeedAndFlushToDisk(index_granularity_for_block); |
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I think it's better to merge it to avoid strange failures in debug tests. |
This was referenced Jan 16, 2021
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alexey-milovidov
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Backport #19123 to 21.1: Fix max granules size in MergeTreeDataWriter
This was referenced Feb 17, 2021
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Fix bug in merge tree data writer which can lead to marks with bigger size than fixed granularity size. Fixes #18913.