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https://issues.apache.org/jira/browse/HBASE-21800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16802267#comment-16802267
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Andrew Purtell commented on HBASE-21800:
----------------------------------------
2 digit ones are bogus. We use three digit fix versions. For each branch pick
the fix version what would be the next release version (e.g. 1.3, last release
is 1.3.3, fix version should be 1.3.4 for next)
Otherwise the changelog produced by Jira will be wrong, and we need it to be
correct, because we make our CHANGES.txt from the Jira changelog.
> RegionServer aborted due to NPE from MetaTableMetrics coprocessor
> -----------------------------------------------------------------
>
> Key: HBASE-21800
> URL: https://issues.apache.org/jira/browse/HBASE-21800
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors, meta, metrics, Operability
> Reporter: Sakthi
> Assignee: Sakthi
> Priority: Critical
> Labels: Meta
> Fix For: 3.0.0, 1.5.0, 2.2.0, 1.4.10, 2.3.0
>
> Attachments: hbase-21800.branch-1.001.patch,
> hbase-21800.branch-1.002.patch, hbase-21800.branch-1.003.patch,
> hbase-21800.branch-1.004.patch, hbase-21800.master.001.patch,
> hbase-21800.master.002.patch, hbase-21800.master.003.patch
>
>
> I was just playing around the code, trying to capture "Top k" table metrics
> from MetaMetrics, when I bumped into this issue. Though currently we are not
> capturing "Top K" table metrics, but we can encounter this issue because of
> the "Top k Clients" that is implemented using the LossyAlgo.
>
> RegionServer gets aborted due to a NPE from MetaTableMetrics coprocessor. The
> log looks somewhat like this:
> {code:java}
> 2019-01-28 23:31:10,311 ERROR
> [RpcServer.priority.FPBQ.Fifo.handler=19,queue=1,port=16020]
> coprocessor.CoprocessorHost: The coprocessor
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics threw
> java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.markMeterIfPresent(MetaTableMetrics.java:123)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.tableMetricRegisterAndMark2(MetaTableMetrics.java:233)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.preGetOp(MetaTableMetrics.java:82)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$19.call(RegionCoprocessorHost.java:840)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$19.call(RegionCoprocessorHost.java:837)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost$ObserverOperationWithoutResult.callObserver(CoprocessorHost.java:551)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost.execOperation(CoprocessorHost.java:625)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.preGet(RegionCoprocessorHost.java:837)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2608)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2547)
> at
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:41998)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:413)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:130)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304)
> 2019-01-28 23:31:10,314 ERROR
> [RpcServer.priority.FPBQ.Fifo.handler=19,queue=1,port=16020]
> regionserver.HRegionServer: ***** ABORTING region server
> 10.0.0.24,16020,1548747043814: The coprocessor
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics threw
> java.lang.NullPointerException *****
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.markMeterIfPresent(MetaTableMetrics.java:123)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.tableMetricRegisterAndMark2(MetaTableMetrics.java:233)
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics$ExampleRegionObserverMeta.preGetOp(MetaTableMetrics.java:82)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$19.call(RegionCoprocessorHost.java:840)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$19.call(RegionCoprocessorHost.java:837)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost$ObserverOperationWithoutResult.callObserver(CoprocessorHost.java:551)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost.execOperation(CoprocessorHost.java:625)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.preGet(RegionCoprocessorHost.java:837)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2608)
> at
> org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2547)
> at
> org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:41998)
> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:413)
> at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:130)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324)
> at
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304)
> {code}
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