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https://issues.apache.org/jira/browse/MAPREDUCE-6554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15102053#comment-15102053
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Jason Lowe commented on MAPREDUCE-6554:
---------------------------------------
+1 lgtm. The checkstyle issue was present before the patch as well, and the
whitespace, tab, and license warnings are not due to this patch.
Committing this.
> MRAppMaster servicestart failing with NPE in
> MRAppMaster#parsePreviousJobHistory
> ---------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6554
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6554
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Bibin A Chundatt
> Assignee: Bibin A Chundatt
> Priority: Critical
> Attachments: 0001-MAPREDUCE-6554.patch, 0002-MAPREDUCE-6554.patch,
> 0003-MAPREDUCE-6554.patch, MAPREDUCE-6554-branch-2.7.001.patch,
> MAPREDUCE-6554-branch-2.7.patch
>
>
> Create scenario so that MR app master gets preempted.
> On next MRAppMaster launch tried to recover previous job history file
> {{MRAppMaster#parsePreviousJobHistory}}
> {noformat}
> 2015-11-21 13:52:27,722 INFO [main]
> org.apache.hadoop.service.AbstractService: Service
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster failed in state STARTED;
> cause: java.lang.NullPointerException
> java.lang.NullPointerException
> at java.io.StringReader.<init>(StringReader.java:50)
> at org.apache.avro.Schema$Parser.parse(Schema.java:917)
> at org.apache.avro.Schema.parse(Schema.java:966)
> at
> org.apache.hadoop.mapreduce.jobhistory.EventReader.<init>(EventReader.java:75)
> at
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryParser.parse(JobHistoryParser.java:139)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.parsePreviousJobHistory(MRAppMaster.java:1256)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.processRecovery(MRAppMaster.java:1225)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStart(MRAppMaster.java:1087)
> at
> org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$4.run(MRAppMaster.java:1570)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1673)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.initAndStartAppMaster(MRAppMaster.java:1566)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.main(MRAppMaster.java:1499)
> 2015-11-21 13:52:27,725 INFO [main]
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler: Stopping
> JobHistoryEventHandler. Size of the outstanding queue size is 0
> {noformat}
> EventReader(EventReader stream)
> {noformat}
> this.version = in.readLine();
> ...
> Schema myschema = new
> SpecificData(Event.class.getClassLoader()).getSchema(Event.class);
> this.schema = Schema.parse(in.readLine());
> {noformat}
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