[jira] [Created] (MAPREDUCE-6905) Fix meaningless operations in TestDFSIO in some situation.

["LiXin Ge (JIRA)" <ji...@apache.org>]

LiXin Ge created MAPREDUCE-6905:
-----------------------------------

             Summary: Fix meaningless operations in TestDFSIO in some situation.
                 Key: MAPREDUCE-6905
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6905
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: tools/rumen
    Affects Versions: 3.0.0-alpha4
            Reporter: LiXin Ge
            Assignee: LiXin Ge


When run TestDFSIO in write mode with 2 million nrFiles, it will *takes hours* to create control files and get IOException as last because of directory item limit is exceeded. And, it will leave over 1 million useless files which will be deleted when run TestDFSIO again with acceptable nrFiles.   
{quote}
17/06/21 09:12:16 INFO fs.TestDFSIO: creating control file: 1024 bytes, 2000000 files
java.io.IOException: The directory item limit of /benchmarks/TestDFSIO/io_control is exceeded: limit=1048576 items=1048576
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.verifyMaxDirItems(FSDirectory.java:2033)
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:2084)
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addLastINode(FSDirectory.java:2053)
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addINode(FSDirectory.java:1873)
	at org.apache.hadoop.hdfs.server.namenode.FSDirectory.addFile(FSDirectory.java:327)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:2750)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInt(FSNamesystem.java:2632)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:2520)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.create(NameNodeRpcServer.java:579)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.create(ClientNamenodeProtocolServerSideTranslatorPB.java:394)
	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$1.run(Server.java:2040)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2036)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1656)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2034)
	at org.apache.hadoop.fs.TestDFSIO.createControlFile(TestDFSIO.java:302)
	at org.apache.hadoop.fs.TestDFSIO.run(TestDFSIO.java:751)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
	at org.apache.hadoop.fs.TestDFSIO.main(TestDFSIO.java:650)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:71)
	at org.apache.hadoop.util.ProgramDriver.run(ProgramDriver.java:144)
	at org.apache.hadoop.test.MapredTestDriver.run(MapredTestDriver.java:118)
	at org.apache.hadoop.test.MapredTestDriver.main(MapredTestDriver.java:126)
{quote}

In brief, we'd better check the parameter of nrFiles before it waste our time and hurt our feelings.



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