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Posted to issues@hbase.apache.org by "Sakthi (JIRA)" <ji...@apache.org> on 2019/02/04 20:49:00 UTC
[jira] [Commented] (HBASE-21800) RegionServer aborted due to NPE
from MetaTableMetrics coprocessor
[ https://issues.apache.org/jira/browse/HBASE-21800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16760208#comment-16760208 ]
Sakthi commented on HBASE-21800:
--------------------------------
Ping [~apurtell], [~Apache9] anything else pending here? :)
> 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
> Attachments: 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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