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https://issues.apache.org/jira/browse/HBASE-28839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HBASE-28839 started by Janardhan Hungund.
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> Exception handling during retrieval of bucket-cache from persistence.
> ---------------------------------------------------------------------
>
> Key: HBASE-28839
> URL: https://issues.apache.org/jira/browse/HBASE-28839
> Project: HBase
> Issue Type: Bug
> Components: BucketCache
> Reporter: Janardhan Hungund
> Assignee: Janardhan Hungund
> Priority: Major
>
> During the retrieval of bucket cache from the persistence file during the
> startup, it was observed that, if an exception, other than, the IOException
> occurs, the bucket cache internal members remain uninitialised and cause the
> bucket to remain unusable. Also, the NullPointerExceptions are seen when,
> trying to use the cache.
> {code:java}
> 2024-09-10 14:33:30,020 ERROR
> org.apache.hadoop.hbase.io.hfile.bucket.BucketCache: WriterThread encountered
> error
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.io.hfile.bucket.BucketCache$RAMQueueEntry.writeToCache(BucketCache.java:1975)
> at
> org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.doDrain(BucketCache.java:1298)
> {code}
>
> {code:java}
> 2024-09-13 07:01:05,964 ERROR
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: Error getting metrics
> from source RegionServer,sub=Server
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.getFreeSize(BucketCache.java:1819)
> at
> org.apache.hadoop.hbase.io.hfile.CombinedBlockCache.getFreeSize(CombinedBlockCache.java:179)
> at
> org.apache.hadoop.hbase.regionserver.MetricsRegionServerWrapperImpl.getBlockCacheFreeSize(MetricsRegionServerWrapperImpl.java:308)
> at
> org.apache.hadoop.hbase.regionserver.MetricsRegionServerSourceImpl.addGaugesToMetricsRecordBuilder(MetricsRegionServerSourceImpl.java:525)
> at
> org.apache.hadoop.hbase.regionserver.MetricsRegionServerSourceImpl.getMetrics(MetricsRegionServerSourceImpl.java:333)
> {code}
> All type of exceptions need to be handled gracefully and the bucket cache
> needs to reinitialised to enable the bucket cache.
> Thanks,
> Janardhan
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