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Date: Wed, 2 Aug 2017 18:00:09 +0000 (UTC)
From: "Prabhu Joseph (JIRA)" <jira@apache.org>
To: yarn-dev@hadoop.apache.org
Message-ID: <JIRA.13091959.1501696786000.76233.1501696809782@Atlassian.JIRA>
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Subject: [jira] [Created] (YARN-6929) yarn.nodemanager.remote-app-log-dir
 structure is not scalable
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archived-at: Wed, 02 Aug 2017 18:00:19 -0000

Prabhu Joseph created YARN-6929:
-----------------------------------

             Summary: yarn.nodemanager.remote-app-log-dir structure is not scalable
                 Key: YARN-6929
                 URL: https://issues.apache.org/jira/browse/YARN-6929
             Project: Hadoop YARN
          Issue Type: Bug
          Components: log-aggregation
    Affects Versions: 2.7.3
            Reporter: Prabhu Joseph
            Assignee: Prabhu Joseph


The current directory structure for yarn.nodemanager.remote-app-log-dir is not scalable. Maximum Subdirectory limit by default is 1048576 (HDFS-6102). With retention yarn.nodemanager.log.retain-second of 7days, there are more chances LogAggregationService fails to create a new directory with FSLimitException$MaxDirectoryItemsExceededException.

The current structure is <yarn.nodemanager.remote-app-log-dir>/<user>/logs/<job_name>. This can be improved with adding date as a subdirectory like 
<yarn.nodemanager.remote-app-log-dir>/<user>/logs/<date>/<job_name> 


{code}
WARN org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService: Application failed to init aggregation 
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.protocol.FSLimitException$MaxDirectoryItemsExceededException): The directory item limit of /app-logs/yarn/logs is exceeded: limit=1048576 items=1048576 
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.verifyMaxDirItems(FSDirectory.java:2021) 
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:2072) 
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:1841) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsRecursively(FSNamesystem.java:4351) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:4262) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInt(FSNamesystem.java:4221) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:4194) 
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.mkdirs(NameNodeRpcServer.java:813) 
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.mkdirs(ClientNamenodeProtocolServerSideTranslatorPB.java:600) 
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java) 
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:619) 
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:962) 
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2039) 
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2035) 
at java.security.AccessController.doPrivileged(Native Method) 
at javax.security.auth.Subject.doAs(Subject.java:415) 
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628) 
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2033) 
at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.createAppDir(LogAggregationService.java:308) 
at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.initAppAggregator(LogAggregationService.java:366) 
at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.initApp(LogAggregationService.java:320) 
at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.handle(LogAggregationService.java:443) 
at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.handle(LogAggregationService.java:67) 
at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:173) 
at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:106) 
at java.lang.Thread.run(Thread.java:745) 
Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.protocol.FSLimitException$MaxDirectoryItemsExceededException): The directory item limit of /app-logs/yarn/logs is exceeded: limit=1048576 items=1048576 
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.verifyMaxDirItems(FSDirectory.java:2021) 
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:2072) 
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedMkdir(FSDirectory.java:1841) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsRecursively(FSNamesystem.java:4351) 
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:4262) 
{code}

Thanks to Robert Mancuso for finding this issue.


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