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https://issues.apache.org/jira/browse/HBASE-21130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596247#comment-16596247
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Aman Poonia commented on HBASE-21130:
-------------------------------------
mostly duplicate of HBASE-21069
> NullPointerException in StoreScanner
> ------------------------------------
>
> Key: HBASE-21130
> URL: https://issues.apache.org/jira/browse/HBASE-21130
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 1.3.1
> Reporter: Chandra Sekhar
> Priority: Critical
>
> I've created a script that will put continuous put one record (size 2.5KB)
> and flush immediately -- in middle am doing compaction at regular intervals.
> Rate of flushes are around 20flushes/sec. After some time, my RS aborted and
> never came up back
> with the following error
> {code:java}
> 2018-08-29 11:34:34,183 DEBUG [flush-table-TestTable_client_1258196-thread-1]
> regionserver.RSRpcServices: Closing region operation on
> TestTable_client_1,32816,1535513244999.762a3e633b03e5f847f357aca28768d0.
> 2018-08-29 11:34:34,183 INFO
> [RpcServer.FifoWFPBQ.default.handler=49,queue=4,port=16040]
> regionserver.RSRpcServices: flush table task succeed 1, failed 10.
> 2018-08-29 11:34:34,280 INFO [MemStoreFlusher.0]
> regionserver.DefaultStoreFlusher: Flushed, sequenceid=230, memsize=4.2 K,
> hasBloomFilter=false, into tmp file
> hdfs://hacluster/hbase/data/hbase/meta/1588230740/.tmp/1cf1deee293848b0bea08940696dbd2a
> 2018-08-29 11:34:34,290 INFO [MemStoreFlusher.0]
> regionserver.StoreFile$Reader: Loaded Delete Family Bloom
> (CompoundBloomFilter) metadata for 1cf1deee293848b0bea08940696dbd2a
> 2018-08-29 11:34:34,291 DEBUG [MemStoreFlusher.0]
> regionserver.HRegionFileSystem: Committing store file
> hdfs://hacluster/hbase/data/hbase/meta/1588230740/.tmp/1cf1deee293848b0bea08940696dbd2a
> as
> hdfs://hacluster/hbase/data/hbase/meta/1588230740/info/1cf1deee293848b0bea08940696dbd2a
> 2018-08-29 11:34:34,304 INFO [MemStoreFlusher.0]
> regionserver.StoreFile$Reader: Loaded Delete Family Bloom
> (CompoundBloomFilter) metadata for 1cf1deee293848b0bea08940696dbd2a
> 2018-08-29 11:34:34,304 INFO [MemStoreFlusher.0] regionserver.HStore: Added
> hdfs://hacluster/hbase/data/hbase/meta/1588230740/info/1cf1deee293848b0bea08940696dbd2a,
> entries=13, sequenceid=230, filesize=6.6 K
> 2018-08-29 11:34:34,307 FATAL [MemStoreFlusher.0] regionserver.HRegionServer:
> ABORTING region server host-xxxx,16040,1535454741321: Replay of WAL required.
> Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region: hbase:meta,,1
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2578)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2255)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2217)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:2108)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.flush(HRegion.java:2034)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:505)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:475)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$900(MemStoreFlusher.java:75)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:263)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
> at java.util.ArrayList.<init>(ArrayList.java:177)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.updateReaders(StoreScanner.java:826)
> at
> org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:1117)
> at
> org.apache.hadoop.hbase.regionserver.HStore.updateStorefiles(HStore.java:1090)
> at
> org.apache.hadoop.hbase.regionserver.HStore.access$700(HStore.java:120)
> at
> org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.commit(HStore.java:2450)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2533)
> ... 9 more
> 2018-08-29 11:34:34,307 FATAL [MemStoreFlusher.0] regionserver.HRegionServer:
> RegionServer abort: loaded coprocessors are:
> [org.apache.hadoop.hbase.security.access.AccessController,
> org.apache.hadoop.hbase.
> {code}
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