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https://issues.apache.org/jira/browse/YARN-6929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113176#comment-16113176
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Prabhu Joseph commented on YARN-6929:
-------------------------------------
Thanks, missed it. Hash can be generated from ApplicationID#getId() with
yarn.log-aggregation.retain-seconds * 24 buckets (Hoping 1 hour will have less
than millions of apps). This way random read and write of appDir is possible.
Deletion Service will traverse on these hashDirs for every userDir.
> 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.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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