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https://issues.apache.org/jira/browse/HBASE-13329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14382131#comment-14382131
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Ruben Aguiar commented on HBASE-13329:
--------------------------------------
So, after having the error every time I restarted the cluster (because it tried
to replay the edits), I've manually build hbase with the change I proposed
above (changing diffIdx from short to int). After restarting the region server,
the region was sucessfully flushed. So the fix does solve the problem. I'll
keep benchmarking my cluster and see if this error continues to happen.
> Memstore flush fails if data has always the same value, breaking the region
> ---------------------------------------------------------------------------
>
> Key: HBASE-13329
> URL: https://issues.apache.org/jira/browse/HBASE-13329
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 1.0.1
> Environment: linux-debian-jessie
> ec2 - t2.micro instances
> Reporter: Ruben Aguiar
> Priority: Critical
> Fix For: 2.0.0, 1.1.0
>
>
> While trying to benchmark my opentsdb cluster, I've created a script that
> sends to hbase always the same value (in this case 1). After a few minutes,
> the whole region server crashes and the region itself becomes impossible to
> open again (cannot assign or unassign). After some investigation, what I saw
> on the logs is that when a Memstore flush is called on a large region (128mb)
> the process errors, killing the regionserver. On restart, replaying the edits
> generates the same error, making the region unavailable. Tried to manually
> unassign, assign or close_region. That didn't work because the code that
> reads/replays it crashes.
> From my investigation this seems to be an overflow issue. The logs show that
> the function getMinimumMidpointArray tried to access index -32743 of an
> array, extremely close to the minimum short value in Java. Upon investigation
> of the source code, it seems an index short is used, being incremented as
> long as the two vectors are the same, probably making it overflow on large
> vectors with equal data. Changing it to int should solve the problem.
> Here follows the hadoop logs of when the regionserver went down. Any help is
> appreciated. Any other information you need please do tell me:
> 2015-03-24 18:00:56,187 INFO [regionserver//10.2.0.73:16020.logRoller]
> wal.FSHLog: Rolled WAL
> /hbase/WALs/10.2.0.73,16020,1427216382590/10.2.0.73%2C16020%2C1427216382590.default.1427220018516
> with entries=143, filesize=134.70 MB; new WAL
> /hbase/WALs/10.2.0.73,16020,1427216382590/10.2.0.73%2C16020%2C1427216382590.default.1427220056140
> 2015-03-24 18:00:56,188 INFO [regionserver//10.2.0.73:16020.logRoller]
> wal.FSHLog: Archiving
> hdfs://10.2.0.74:8020/hbase/WALs/10.2.0.73,16020,1427216382590/10.2.0.73%2C16020%2C1427216382590.default.1427219987709
> to
> hdfs://10.2.0.74:8020/hbase/oldWALs/10.2.0.73%2C16020%2C1427216382590.default.1427219987709
> 2015-03-24 18:04:35,722 INFO [MemStoreFlusher.0] regionserver.HRegion:
> Started memstore flush for
> tsdb,,1427133969325.52bc1994da0fea97563a4a656a58bec2., current region
> memstore size 128.04 MB
> 2015-03-24 18:04:36,154 FATAL [MemStoreFlusher.0] regionserver.HRegionServer:
> ABORTING region server 10.2.0.73,16020,1427216382590: Replay of WAL required.
> Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region:
> tsdb,,1427133969325.52bc1994da0fea97563a4a656a58bec2.
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1999)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1770)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1702)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:445)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:407)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$800(MemStoreFlusher.java:69)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:225)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ArrayIndexOutOfBoundsException: -32743
> at
> org.apache.hadoop.hbase.CellComparator.getMinimumMidpointArray(CellComparator.java:478)
> at
> org.apache.hadoop.hbase.CellComparator.getMidpoint(CellComparator.java:448)
> at
> org.apache.hadoop.hbase.io.hfile.HFileWriterV2.finishBlock(HFileWriterV2.java:165)
> at
> org.apache.hadoop.hbase.io.hfile.HFileWriterV2.checkBlockBoundary(HFileWriterV2.java:146)
> at
> org.apache.hadoop.hbase.io.hfile.HFileWriterV2.append(HFileWriterV2.java:263)
> at
> org.apache.hadoop.hbase.io.hfile.HFileWriterV3.append(HFileWriterV3.java:87)
> at
> org.apache.hadoop.hbase.regionserver.StoreFile$Writer.append(StoreFile.java:932)
> at
> org.apache.hadoop.hbase.regionserver.StoreFlusher.performFlush(StoreFlusher.java:121)
> at
> org.apache.hadoop.hbase.regionserver.DefaultStoreFlusher.flushSnapshot(DefaultStoreFlusher.java:71)
> at
> org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:879)
> at
> org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.flushCache(HStore.java:2128)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1953)
> ... 7 more
> 2015-03-24 18:04:36,156 FATAL [MemStoreFlusher.0] regionserver.HRegionServer:
> RegionServer abort: loaded coprocessors are:
> [org.apache.hadoop.hbase.coprocessor.MultiRowMutationEndpoint]
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