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From "Konstantin Shvachko (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3438) TestRaidNode fails because of "Too many open files"
Date Mon, 21 Nov 2011 02:43:51 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153953#comment-13153953
] 

Konstantin Shvachko commented on MAPREDUCE-3438:
------------------------------------------------

This is the last failing test for 0.22. See last several builds for Hadoop-Mapreduce-22-branch.
The failure is because of the following exception:
{code}
11/11/21 01:05:26 INFO hdfs.DFSClient: Failed to connect to /127.0.0.1:45905, add to deadNodes
and continue
java.net.SocketException: Too many open files
	at sun.nio.ch.Net.socket0(Native Method)
	at sun.nio.ch.Net.socket(Net.java:97)
	at sun.nio.ch.SocketChannelImpl.<init>(SocketChannelImpl.java:84)
	at sun.nio.ch.SelectorProviderImpl.openSocketChannel(SelectorProviderImpl.java:37)
	at java.nio.channels.SocketChannel.open(SocketChannel.java:105)
	at org.apache.hadoop.net.StandardSocketFactory.createSocket(StandardSocketFactory.java:63)
	at org.apache.hadoop.hdfs.DFSInputStream.getBlockReader(DFSInputStream.java:702)
	at org.apache.hadoop.hdfs.DFSInputStream.blockSeekTo(DFSInputStream.java:390)
	at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:514)
	at java.io.DataInputStream.read(DataInputStream.java:132)
	at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:122)
	at org.apache.hadoop.raid.RaidUtils.copyBytes(RaidUtils.java:93)
	at org.apache.hadoop.raid.Decoder.decodeFile(Decoder.java:133)
	at org.apache.hadoop.raid.RaidNode.unRaid(RaidNode.java:867)
	at org.apache.hadoop.raid.RaidNode.recoverFile(RaidNode.java:333)
	at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:349)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1482)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1478)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1153)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1476)
{code}
Which leads to {{BlockMissingException}} and failure of {{TestRaidNode.testPathFilter}} in
the end.

The fix is either 
# to increase ulimit on Jenkins machines, which I did on my box and everything passed, or

# to scale down the test itself.
                
> TestRaidNode fails because of "Too many open files"
> ---------------------------------------------------
>
>                 Key: MAPREDUCE-3438
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3438
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/raid
>    Affects Versions: 0.22.0
>            Reporter: Konstantin Shvachko
>             Fix For: 0.22.0
>
>
> TestRaidNode fails because it opens many connections.

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