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https://issues.apache.org/jira/browse/YARN-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14935989#comment-14935989
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Li Lu commented on YARN-4210:
-----------------------------

Also, w.r.t application queries, let's prioritize it since with the current set 
of REST APIs, we cannot query anything related to applications unless we know 
its id. We need some ways to list all apps in a flow run to finish a full 
story. Hopefully this can happen in parallel with this JIRA to speed the whole 
thing up. 

> 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
>
>
> 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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