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Posted to reviews@spark.apache.org by "yaooqinn (via GitHub)" <gi...@apache.org> on 2023/08/02 04:23:02 UTC
[GitHub] [spark] yaooqinn opened a new pull request, #42287: [SPARK-44632][Core] DiskBlockManager should check and be able to handle stale directories
yaooqinn opened a new pull request, #42287:
URL: https://github.com/apache/spark/pull/42287
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### What changes were proposed in this pull request?
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The subDir in the memory cache could be stale, for example, after a damaged disk repair or replacement. This dir could be accessed subsequently by others. Especially, `filename` generated by `RDDBlockId` is unchanged between task reties, so it probably attempts to access the same subDir repeatedly. Therefore, it is necessary to check if the subDir exists. If it is stale and the hardware has been recovered without data and directories, we will recreate the subDir to prevent FileNotFoundException during writing.
This PR adds an existence checker for cache sub dir entry.
### Why are the changes needed?
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Enhance the level of resistance.
- DataFrame/SQL caches with 1 replica may not be able to recover by itself in such case
- Shuffle files will also access these directories from time to time, which causes unnecessary retries
### Does this PR introduce _any_ user-facing change?
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no
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add ut
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[GitHub] [spark] mridulm commented on pull request #42287: [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories
Posted by "mridulm (via GitHub)" <gi...@apache.org>.
mridulm commented on PR #42287:
URL: https://github.com/apache/spark/pull/42287#issuecomment-1661494485
> "after a damaged disk repair or replacement"
Wont this not result in a restart of the node ?
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[GitHub] [spark] yaooqinn closed pull request #42287: [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories
Posted by "yaooqinn (via GitHub)" <gi...@apache.org>.
yaooqinn closed pull request #42287: [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories
URL: https://github.com/apache/spark/pull/42287
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Re: [PR] [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories [spark]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed pull request #42287: [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories
URL: https://github.com/apache/spark/pull/42287
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[GitHub] [spark] yaooqinn commented on pull request #42287: [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories
Posted by "yaooqinn (via GitHub)" <gi...@apache.org>.
yaooqinn commented on PR #42287:
URL: https://github.com/apache/spark/pull/42287#issuecomment-1661533335
Maybe we can do a hot-swap by rescanning
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[GitHub] [spark] yaooqinn commented on pull request #42287: [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories
Posted by "yaooqinn (via GitHub)" <gi...@apache.org>.
yaooqinn commented on PR #42287:
URL: https://github.com/apache/spark/pull/42287#issuecomment-1664924280
cc @tgravescs @cloud-fan @HyukjinKwon, thanks
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Re: [PR] [SPARK-44632][CORE] DiskBlockManager should check and be able to handle stale directories [spark]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #42287:
URL: https://github.com/apache/spark/pull/42287#issuecomment-1848792663
We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and ask a committer to remove the Stale tag!
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