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https://issues.apache.org/jira/browse/HBASE-21740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746240#comment-16746240
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lujie commented on HBASE-21740:
-------------------------------
The checkstyle error is intrduced because i want to keep the code style with
exist code, just like:
{code:java}
if (this.compactionChecker != null)
choreService.scheduleChore(compactionChecker);
if (this.periodicFlusher != null) choreService.scheduleChore(periodicFlusher);
if (this.healthCheckChore != null) choreService.scheduleChore(healthCheckChore);
if (this.nonceManagerChore != null)
choreService.scheduleChore(nonceManagerChore);
if (this.storefileRefresher != null)
choreService.scheduleChore(storefileRefresher);
if (this.movedRegionsCleaner != null)
choreService.scheduleChore(movedRegionsCleaner);
if (this.fsUtilizationChore != null)
choreService.scheduleChore(fsUtilizationChore);
{code}
> NPE happens while shutdown the RS
> ---------------------------------
>
> Key: HBASE-21740
> URL: https://issues.apache.org/jira/browse/HBASE-21740
> Project: HBase
> Issue Type: Bug
> Reporter: lujie
> Assignee: lujie
> Priority: Major
> Attachments: HBASE-21740_1.patch
>
>
> while shutdown a NM, we meet the NPE:
> {code:java}
> 2019-01-18 16:52:05,500 INFO [Thread-4] regionserver.HRegionServer: STOPPED:
> Shutdown hook
> 2019-01-18 16:52:05,896 INFO [regionserver/hadoop15:16020]
> regionserver.MetricsRegionServerWrapperImpl: Computing regionserver metrics
> every 5000 milliseconds
> 2019-01-18 16:52:05,978 INFO [regionserver/hadoop15:16020.Chore.1]
> hbase.ScheduledChore: Chore: CompactedHFilesCleaner was stopped
> 2019-01-18 16:52:05,996 ERROR [regionserver/hadoop15:16020]
> regionserver.HRegionServer: Failed init
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.startServices(HRegionServer.java:1978)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.handleReportForDutyResponse(HRegionServer.java:1572)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:975)
> at java.lang.Thread.run(Thread.java:745)
> 2019-01-18 16:52:06,011 ERROR [regionserver/hadoop15:16020]
> regionserver.HRegionServer: ***** ABORTING region server
> hadoop15,16020,1547801516426: Unhandled: Region server startup failed *****
> java.io.IOException: Region server startup failed
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:3392)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.handleReportForDutyResponse(HRegionServer.java:1591)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:975)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.startServices(HRegionServer.java:1978)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.handleReportForDutyResponse(HRegionServer.java:1572)
> ... 2 more
> {code}
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