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Siddharth Seth commented on MAPREDUCE-3931: ------------------------------------------- This looks like other races we've seen where {{build}} is called on the same Proto builder object by multiple threads. In cases of JobId etc - values would end up getting reset to 0. This is the same race in the LocalResource object - but the manifestation is more interesting. 2971811411 is 1330116705875 with the MS 4 bytes set to 0. Turns out, assigning to a long in Java may not be atomic. There's multiple parallel startContainer calls - which access the same LocalReosurce object in the AM - which is where the value can get corrupt. Will attach a patch shortly which adds synchronization to LocalResourcePBImpl. > MR tasks failing due to changing timestamps on Resources to download > -------------------------------------------------------------------- > > Key: MAPREDUCE-3931 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3931 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: mrv2 > Affects Versions: 0.23.0 > Reporter: Vinod Kumar Vavilapalli > Assignee: Siddharth Seth > Fix For: 0.23.2 > > > [~karams] reported this offline. Seems that tasks are randomly failing during > gridmix runs: > {code} > 2012-02-24 21:03:34,912 INFO [AsyncDispatcher event handler] > org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl: Diagnostics > report from attempt_1330116323296_0140_m_003868_0: RemoteTrace: > java.io.IOException: Resource > hdfs://hostname.com:8020/user/hadoop15/.staging/job_1330116323296_0140/job.jar > changed on src filesystem (expected 2971811411, was 1330116705875 > at org.apache.hadoop.yarn.util.FSDownload.copy(FSDownload.java:90) > at > org.apache.hadoop.yarn.util.FSDownload.access$000(FSDownload.java:49) > at org.apache.hadoop.yarn.util.FSDownload$1.run(FSDownload.java:157) > at org.apache.hadoop.yarn.util.FSDownload$1.run(FSDownload.java:155) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1177) > at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:153) > at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:49) > at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) > at java.util.concurrent.FutureTask.run(FutureTask.java:138) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) > at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) > at java.util.concurrent.FutureTask.run(FutureTask.java:138) > at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) > at java.lang.Thread.run(Thread.java:619) > at LocalTrace: > org.apache.hadoop.yarn.exceptions.impl.pb.YarnRemoteExceptionPBImpl: > Resource > hdfs://hostname.com:8020/user/hadoop15/.staging/job_1330116323296_0140/job.jar > changed on src filesystem (expected 2971811411, was 1330116705875 > at > org.apache.hadoop.yarn.server.nodemanager.api.protocolrecords.impl.pb.LocalResourceStatusPBImpl.convertFromProtoFormat(LocalResourceStatusPBImpl.java:217) > at > org.apache.hadoop.yarn.server.nodemanager.api.protocolrecords.impl.pb.LocalResourceStatusPBImpl.getException(LocalResourceStatusPBImpl.java:147) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService$LocalizerRunner.update(ResourceLocalizationService.java:827) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService$LocalizerTracker.processHeartbeat(ResourceLocalizationService.java:497) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService.heartbeat(ResourceLocalizationService.java:222) > at > org.apache.hadoop.yarn.server.nodemanager.api.impl.pb.service.LocalizationProtocolPBServiceImpl.heartbeat(LocalizationProtocolPBServiceImpl.java:46) > at > org.apache.hadoop.yarn.proto.LocalizationProtocol$LocalizationProtocolService$2.callBlockingMethod(LocalizationProtocol.java:57) > at > org.apache.hadoop.yarn.ipc.ProtoOverHadoopRpcEngine$Server.call(ProtoOverHadoopRpcEngine.java:342) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1493) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1489) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1177) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1487) > {code} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira