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https://issues.apache.org/jira/browse/HBASE-28187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk reassigned HBASE-28187:
------------------------------------
Assignee: guluo
> NPE when flushing a non-existing column family
> ----------------------------------------------
>
> Key: HBASE-28187
> URL: https://issues.apache.org/jira/browse/HBASE-28187
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.6.0, 2.4.17, 2.5.5
> Reporter: Ke Han
> Assignee: guluo
> Priority: Major
> Labels: pull-request-available
>
> Flush a columnfamily that doesn't exist in the table will cause NPE ERROR in
> both shell and the HMaster logs.
> h1. Reproduce
> Start up HBase 2.5.9 cluster, executing the following commands with hbase
> shell in HMaster node will lead to NPE. (Can be reproduced determinstically)
> {code:java}
> create 'table', {NAME => 'cf1', VERSIONS => 2, COMPRESSION => 'GZ',
> BLOOMFILTER => 'ROWCOL'}, {NAME => 'cf2', VERSIONS => 4, COMPRESSION =>
> 'NONE', BLOOMFILTER => 'ROWCOL'}
> incr 'table', 'row1', 'cf1:cell', 2
> flush 'table', 'cf3'{code}
> The shell outputs
> {code:java}
> hbase:006:0> create 'table', {NAME => 'cf1', VERSIONS => 2, COMPRESSION =>
> 'GZ', BLOOMFILTER => 'ROWCOL'}, {NAME => 'cf2', VERSIONS => 4, COMPRESSION =>
> 'NONE', BLOOMFILTER => 'ROWCOL'}
> Created table table
> Took 2.1238 seconds
>
> => Hbase::Table - table
> hbase:007:0>
> hbase:008:0> incr 'table', 'row1', 'cf1:cell', 2
> COUNTER VALUE = 2
> Took 0.0131 seconds
>
> hbase:009:0>
> hbase:010:0> flush 'table', 'cf3'
> ERROR: java.io.IOException: java.lang.NullPointerException
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:479)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:124)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:102)
> at org.apache.hadoop.hbase.ipc.RpcHandler.run(RpcHandler.java:82)
> Caused by:
> org.apache.hadoop.hbase.errorhandling.ForeignException$ProxyThrowable:
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.procedure.flush.RegionServerFlushTableProcedureManager$FlushTableSubprocedurePool.waitForOutstandingTasks(RegionServerFlushTableProcedureManager.java:274)
> at
> org.apache.hadoop.hbase.procedure.flush.FlushTableSubprocedure.flushRegions(FlushTableSubprocedure.java:115)
> at
> org.apache.hadoop.hbase.procedure.flush.FlushTableSubprocedure.acquireBarrier(FlushTableSubprocedure.java:126)
> at org.apache.hadoop.hbase.procedure.Subprocedure.call(Subprocedure.java:160)
> at org.apache.hadoop.hbase.procedure.Subprocedure.call(Subprocedure.java:46)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:750)
> For usage try 'help "flush"'
> Took 12.1713 seconds
> {code}
>
> According to the _flush (flush.rb)_ command specification, user can flush a
> specific column family.
> {code:java}
> Flush all regions in passed table or pass a region row to
> flush an individual region or a region server name whose format
> is 'host,port,startcode', to flush all its regions.
> You can also flush a single column family for all regions within a table,
> or for an specific region only.
> For example:
> hbase> flush 'TABLENAME'
> hbase> flush 'TABLENAME','FAMILYNAME' {code}
> In the above case, *cf3* an incorrect input (non-existing column family). If
> user tries to flush it, the expected output is:
> # HBase rejects this operation
> # returns a prompt saying the column family doesn't exist
> {_}"{_}{_}{+}ERROR: Unknown CF...{+}".{_}
>
> In 2.6.0, the flush command would stuck and run into NPE
> {code:java}
> java.lang.NullPointerException: null
> at
> org.apache.hadoop.hbase.regionserver.HRegion.logFatLineOnFlush(HRegion.java:2724)
> ~[hbase-server-2.6.0.jar:2.6.0]
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalPrepareFlushCache(HRegion.java:2640)
> ~[hbase-server-2.6.0.jar:2.6.0]
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2587)
> ~[hbase-server-2.6.0.jar:2.6.0] {code}
> h1. Root Cause
> There's a missing check for the whether the target flushing columnfamily
> exists.
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