[jira] [Created] (HBASE-20917) MetaTableMetrics#stop references uninitialized requestsMap for non-meta region

["Ted Yu (JIRA)" <ji...@apache.org>]

Ted Yu created HBASE-20917:
------------------------------

             Summary: 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
            Reporter: Ted Yu


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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