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Posted to yarn-issues@hadoop.apache.org by "Varun Saxena (JIRA)" <ji...@apache.org> on 2017/10/21 06:07:03 UTC
[jira] [Updated] (YARN-4210) HBase reader throws NPE if Get returns
no rows
[ https://issues.apache.org/jira/browse/YARN-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Varun Saxena updated YARN-4210:
-------------------------------
Fix Version/s: 2.9.0
> 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
> Fix For: 2.9.0, 3.0.0-alpha1
>
> Attachments: YARN-4210-YARN-2928.01.patch, YARN-4210-YARN-2928.02.patch, YARN-4210-YARN-2928.03.patch
>
>
> This JIRA handles multiple issues.
> * 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}
> * ResultScanner is not closed in HBase Reader.
> * Exception encountered while reading start and end time in FlowRunEntityReader
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