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https://issues.apache.org/jira/browse/HBASE-28900?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wellington Chevreuil resolved HBASE-28900.
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Resolution: Fixed
Merged to master, branch-3, branch-2 and cherry-picked into branch-2.6.
> Avoid resetting bucket cache during restart if inconsistency is observed for
> some blocks.
> -----------------------------------------------------------------------------------------
>
> Key: HBASE-28900
> URL: https://issues.apache.org/jira/browse/HBASE-28900
> Project: HBase
> Issue Type: Bug
> Components: BucketCache
> Affects Versions: 2.6.0, 3.0.0-beta-1, 2.7.0
> Reporter: Janardhan Hungund
> Assignee: Janardhan Hungund
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.0.0, 2.7.0, 2.6.2
>
>
> During the execution of persistence of backing map into the persistence file,
> the backing map is not guarded by a lock against caching of blocks and block
> evictions.
> Hence, some of the block entries in the backing map in persistence may not be
> consistent with the bucket cache.
> During, the retrieval of the backing map from persistence if an inconsistency
> is detected, the complete bucket cache is discarded and is rebuilt.
> One of the errors, seen, is, as mentioned below:
> {code:java}
> 2024-09-30 08:58:33,840 WARN
> org.apache.hadoop.hbase.io.hfile.bucket.BucketCache: Can't restore from
> file[/hadoopfs/ephfs1/bucketcache.map]. The bucket cache will be reset and
> rebuilt. Exception seen:
> org.apache.hadoop.hbase.io.hfile.bucket.BucketAllocatorException: Couldn't
> find match for index 26 in free list
> at
> org.apache.hadoop.hbase.io.hfile.bucket.BucketAllocator$Bucket.addAllocation(BucketAllocator.java:140)
> at
> org.apache.hadoop.hbase.io.hfile.bucket.BucketAllocator.<init>(BucketAllocator.java:406)
> at
> org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.retrieveFromFile(BucketCache.java:1486)
> at
> org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.lambda$startPersistenceRetriever$0(BucketCache.java:377)
> at java.base/java.lang.Thread.run(Thread.java:840) {code}
> This retrieval can be optimised to only discard the inconsistent entries in
> the persistent backing map and retain the remaining entries. The bucket cache
> validator will throw away the inconsistent entry from the backing map.
> Thanks,
> Janardhan
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