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https://issues.apache.org/jira/browse/HBASE-20917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16724693#comment-16724693
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stack commented on HBASE-20917:
-------------------------------
What should I do here [~busbey]? Or will I push it out of 2.0.4?
> MetaTableMetrics#stop references uninitialized requestsMap for non-meta region
> ------------------------------------------------------------------------------
>
> Key: HBASE-20917
> URL: https://issues.apache.org/jira/browse/HBASE-20917
> Project: HBase
> Issue Type: Bug
> Components: meta, metrics
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Major
> Fix For: 3.0.0, 1.5.0, 1.4.6, 2.2.0, 2.0.4
>
> Attachments: 20917.addendum, 20917.v1.txt, 20917.v2.txt
>
>
> I noticed the following in test output:
> {code}
> 2018-07-21 15:54:43,181 ERROR [RS_CLOSE_REGION-regionserver/172.17.5.4:0-1]
> executor.EventHandler(186): Caught throwable while processing event
> M_RS_CLOSE_REGION
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.coprocessor.MetaTableMetrics.stop(MetaTableMetrics.java:329)
> at
> org.apache.hadoop.hbase.coprocessor.BaseEnvironment.shutdown(BaseEnvironment.java:91)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$RegionEnvironment.shutdown(RegionCoprocessorHost.java:165)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost.shutdown(CoprocessorHost.java:290)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$4.postEnvCall(RegionCoprocessorHost.java:559)
> at
> org.apache.hadoop.hbase.coprocessor.CoprocessorHost.execOperation(CoprocessorHost.java:622)
> at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.postClose(RegionCoprocessorHost.java:551)
> at org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:1678)
> at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1484)
> at
> org.apache.hadoop.hbase.regionserver.handler.CloseRegionHandler.process(CloseRegionHandler.java:104)
> at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:104)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> {code}
> {{requestsMap}} is only initialized for the meta region.
> However, check for meta region is absent in the stop method:
> {code}
> public void stop(CoprocessorEnvironment e) throws IOException {
> // since meta region can move around, clear stale metrics when stop.
> for (String meterName : requestsMap.keySet()) {
> {code}
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