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https://issues.apache.org/jira/browse/MAPREDUCE-6654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Junping Du reassigned MAPREDUCE-6654:
-------------------------------------
Assignee: Junping Du
> Possible NPE in JobHistoryEventHandler#handleEvent
> --------------------------------------------------
>
> Key: MAPREDUCE-6654
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6654
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Xiao Chen
> Assignee: Junping Du
> Priority: Minor
>
> I have seen NPE thrown from {{JobHistoryEventHandler#handleEvent}}:
> {noformat}
> 2016-03-14 16:42:15,231 INFO [Thread-69]
> org.apache.hadoop.service.AbstractService: Service JobHistoryEventHandler
> failed in state STOPPED; cause: java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.handleEvent(JobHistoryEventHandler.java:570)
> at
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.serviceStop(JobHistoryEventHandler.java:382)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> at
> org.apache.hadoop.service.ServiceOperations.stop(ServiceOperations.java:52)
> at
> org.apache.hadoop.service.ServiceOperations.stopQuietly(ServiceOperations.java:80)
> at
> org.apache.hadoop.service.CompositeService.stop(CompositeService.java:157)
> at
> org.apache.hadoop.service.CompositeService.serviceStop(CompositeService.java:131)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.serviceStop(MRAppMaster.java:1651)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.stop(MRAppMaster.java:1147)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster.shutDownJob(MRAppMaster.java:573)
> at
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster$JobFinishEventHandler$1.run(MRAppMaster.java:620)
> {noformat}
> In the version this exception is thrown, the
> [line|https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryEventHandler.java#L586]
> is:
> {code:java}mi.writeEvent(historyEvent);{code}
> IMHO, this may be caused by an exception in a previous step. Specifically, in
> the kerberized environment, when creating event writer which calls to decrypt
> EEK, the connection to KMS failed. Exception below:
> {noformat}
> 2016-03-14 16:41:57,559 ERROR [eventHandlingThread]
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler: Error
> JobHistoryEventHandler in handleEvent: EventType: AM_STARTED
> java.net.SocketTimeoutException: Read timed out
> at java.net.SocketInputStream.socketRead0(Native Method)
> at java.net.SocketInputStream.read(SocketInputStream.java:152)
> at java.net.SocketInputStream.read(SocketInputStream.java:122)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
> at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
> at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687)
> at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
> at
> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
> at
> java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
> at
> org.apache.hadoop.crypto.key.kms.KMSClientProvider.call(KMSClientProvider.java:520)
> at
> org.apache.hadoop.crypto.key.kms.KMSClientProvider.call(KMSClientProvider.java:505)
> at
> org.apache.hadoop.crypto.key.kms.KMSClientProvider.decryptEncryptedKey(KMSClientProvider.java:779)
> at
> org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider$3.call(LoadBalancingKMSClientProvider.java:185)
> at
> org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider$3.call(LoadBalancingKMSClientProvider.java:181)
> at
> org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider.doOp(LoadBalancingKMSClientProvider.java:94)
> at
> org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider.decryptEncryptedKey(LoadBalancingKMSClientProvider.java:181)
> at
> org.apache.hadoop.crypto.key.KeyProviderCryptoExtension.decryptEncryptedKey(KeyProviderCryptoExtension.java:388)
> at
> org.apache.hadoop.hdfs.DFSClient.decryptEncryptedDataEncryptionKey(DFSClient.java:1420)
> at
> org.apache.hadoop.hdfs.DFSClient.createWrappedOutputStream(DFSClient.java:1522)
> at
> org.apache.hadoop.hdfs.DFSClient.createWrappedOutputStream(DFSClient.java:1507)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:407)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$6.doCall(DistributedFileSystem.java:400)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:400)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:343)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:917)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:898)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:795)
> at
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.createEventWriter(JobHistoryEventHandler.java:428)
> at
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.setupEventWriter(JobHistoryEventHandler.java:468)
> at
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler.handleEvent(JobHistoryEventHandler.java:553)
> at
> org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler$1.run(JobHistoryEventHandler.java:326)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> We should better handle this scenario and not throw an NPE.
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