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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1182) DFS Scalability issue with filecache in large clusters
Date Fri, 30 Mar 2007 23:23:25 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12485677
] 

Owen O'Malley commented on HADOOP-1182:
---------------------------------------

The calls waiting/thread is rarely relevant. Most of the time, it is the time since the call
was received.  I believe the server-side call time out is calculated as 50% of the ipc time
out.

> DFS Scalability issue with filecache in large clusters
> ------------------------------------------------------
>
>                 Key: HADOOP-1182
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1182
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.12.1
>            Reporter: Christian Kunz
>
> When using filecache to distribute supporting files for map/reduce applications in a
1000 node cluster, many map tasks fail  because of timeouts. There was no such problem using
a 200 node cluster for the same applications with comparable input data. Either the whole
job fails because of too many map failures, or even worse, some map tasks hang indefinitely.
> java.net.SocketTimeoutException: timed out waiting for rpc response
> 	at org.apache.hadoop.ipc.Client.call(Client.java:473)
> 	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:163)
> 	at org.apache.hadoop.dfs.$Proxy1.exists(Unknown Source)
> 	at org.apache.hadoop.dfs.DFSClient.exists(DFSClient.java:320)
> 	at org.apache.hadoop.dfs.DistributedFileSystem$RawDistributedFileSystem.exists(DistributedFileSystem.java:170)
> 	at org.apache.hadoop.dfs.DistributedFileSystem$RawDistributedFileSystem.open(DistributedFileSystem.java:125)
> 	at org.apache.hadoop.fs.ChecksumFileSystem$FSInputChecker.(ChecksumFileSystem.java:110)
> 	at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:330)
> 	at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:245)
> 	at org.apache.hadoop.filecache.DistributedCache.createMD5(DistributedCache.java:327)
> 	at org.apache.hadoop.filecache.DistributedCache.ifExistsAndFresh(DistributedCache.java:253)
> 	at org.apache.hadoop.filecache.DistributedCache.localizeCache(DistributedCache.java:169)
> 	at org.apache.hadoop.filecache.DistributedCache.getLocalCache(DistributedCache.java:86)
> 	at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:117)

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