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https://issues.apache.org/jira/browse/YARN-6929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prabhu Joseph updated YARN-6929:
--------------------------------
    Attachment: YARN-6929.3.patch

> 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
>         Attachments: YARN-6929.1.patch, YARN-6929.2.patch, YARN-6929.2.patch, 
> YARN-6929.3.patch, YARN-6929.patch
>
>
> 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.log-aggregation.retain-seconds 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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