Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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2.7.3
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None
Description
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$MaxDirectoryItemsExceededException.
The current structure is <yarn.nodemanager.remote-app-log-dir>/<user>/logs/<job_name>. This can be improved with adding date as a subdirectory like
<yarn.nodemanager.remote-app-log-dir>/<user>/logs/<date>/<job_name>
WARN org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService: Application failed to init aggregation org.apache.hadoop.yarn.exceptions.YarnRuntimeException: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.protocol.FSLimitException$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)
Thanks to Robert Mancuso for finding this issue.
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Update:
New App Log Dir Structure:
{aggregation_log_root}/{user}/bucket_{suffix}/{bucket1}/{appId}
where suffix is logs or logs-ifile
bucket1 is application#getId % 10000
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Issue Links
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