Sakthi created HBASE-21800:
------------------------------
Summary: 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
Reporter: Sakthi
Assignee: Sakthi
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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