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https://issues.apache.org/jira/browse/MAPREDUCE-6198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14254074#comment-14254074
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zhihai xu commented on MAPREDUCE-6198:
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thanks [~rkanter] for reviewing and committing the patch.
> NPE from JobTracker#resolveAndAddToTopology in MR1 cause initJob and
> heartbeat failure.
> ---------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6198
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6198
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv1
> Reporter: zhihai xu
> Assignee: zhihai xu
> Fix For: 1.3.0
>
> Attachments: MAPREDUCE-6198.mr1.000.patch
>
>
> NPE from JobTracker#resolveAndAddToTopology in MR1 cause initJob and
> heartbeat failure. The NPE is caused by dnsToSwitchMapping.resolve return
> null at the following:
> {code}
> List <String> rNameList = dnsToSwitchMapping.resolve(tmpList);
> String rName = rNameList.get(0);
> {code}
> I check the code in MR2, MR2 handle it correctly in coreResolve of
> RackResolver.java
> {code}
> List <String> rNameList = dnsToSwitchMapping.resolve(tmpList);
> String rName = null;
> if (rNameList == null || rNameList.get(0) == null) {
> rName = NetworkTopology.DEFAULT_RACK;
> LOG.info("Couldn't resolve " + hostName + ". Falling back to "
> + NetworkTopology.DEFAULT_RACK);
> } else {
> rName = rNameList.get(0);
> LOG.info("Resolved " + hostName + " to " + rName);
> }
> {code}
> We should do the same in MR1, if dnsToSwitchMapping.resolve return null, use
> NetworkTopology.DEFAULT_RACK.
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