[jira] [Created] (HBASE-28839) Exception handling during retrieval of bucket-cache from persistence.

[Janardhan Hungund (Jira)]

Janardhan Hungund created HBASE-28839:
-----------------------------------------

             Summary: 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


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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