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https://issues.apache.org/jira/browse/YARN-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14938185#comment-14938185
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Li Lu commented on YARN-4210:
-----------------------------

+1. 

> HBase reader throws NPE if Get returns no rows
> ----------------------------------------------
>
>                 Key: YARN-4210
>                 URL: https://issues.apache.org/jira/browse/YARN-4210
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>         Attachments: YARN-4210-YARN-2928.01.patch, 
> YARN-4210-YARN-2928.02.patch, YARN-4210-YARN-2928.03.patch
>
>
> If HBase Get does not fetch any rows for the query, we still try to parse the 
> result and read fields. This leads to NPE while reading metrics. We should 
> not attempt to read anything if no row is returned i.e. result is empty.
> Found during web UI poc testing. 
> {noformat}
> 2015-09-29 20:22:32,027 ERROR [95336304@qtp-1814206058-0] 
> reader.TimelineReaderWebServices 
> (TimelineReaderWebServices.java:handleException(199)) - Error while 
> processing REST request
> java.lang.NullPointerException
>         at 
> org.apache.hadoop.yarn.server.timelineservice.storage.common.ColumnHelper.readResultsWithTimestamps(ColumnHelper.java:176)
>         at 
> org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunColumnPrefix.readResultsWithTimestamps(FlowRunColumnPrefix.java:182)
>         at 
> org.apache.hadoop.yarn.server.timelineservice.storage.TimelineEntityReader.readMetrics(TimelineEntityReader.java:212)
>         at 
> org.apache.hadoop.yarn.server.timelineservice.storage.FlowRunEntityReader.parseEntity(FlowRunEntityReader.java:136)
>         at 
> org.apache.hadoop.yarn.server.timelineservice.storage.TimelineEntityReader.readEntity(TimelineEntityReader.java:137)
>         at 
> org.apache.hadoop.yarn.server.timelineservice.storage.HBaseTimelineReaderImpl.getEntity(HBaseTimelineReaderImpl.java:72)
>         at 
> org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderManager.getEntity(TimelineReaderManager.java:93)
>         at 
> org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderWebServices.getFlowRun(TimelineReaderWebServices.java:403)
> {noformat}



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