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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-242) job fails because of "No valid local directories in property: " exception
Date Tue, 23 May 2006 20:30:30 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-242?page=comments#action_12412984 ] 

eric baldeschwieler commented on HADOOP-242:

perhaps we should not record failure until a job has been tried on two nodes?  Then we could
collect stats on frequency that a job fails on a given node.

Also 4 failures seems odd.  Shouldn't we just have a configurable allowable % failure?  That
will scale evenly.

> job fails because of "No valid local directories in property: " exception
> -------------------------------------------------------------------------
>          Key: HADOOP-242
>          URL: http://issues.apache.org/jira/browse/HADOOP-242
>      Project: Hadoop
>         Type: Bug

>   Components: mapred
>     Reporter: Yoram Arnon
>     Assignee: Sameer Paranjpye

> when running a fairly large job, of 70+K map tasks, I get many exceptions as shown below,
and eventually the job failes when a task fails four times.
> The exception doesn't really tell us enough information to debug this properly, so the
first thing to do would be to add more information (path) to the exception.
> The path indicated in the config file exists, is writable and valid, though 'path' may
be anything.
> the exception:
> java.io.IOException: No valid local directories in property: mapred.local.dir at org.apache.hadoop.conf.Configuration.getLocalPath(Configuration.java:293)
at org.apache.hadoop.mapred.JobConf.getLocalPath(JobConf.java:153) at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.localizeTask(TaskTracker.java:523)
at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.launchTask(TaskTracker.java:572) at
org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:389) at org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:303)
at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:418) at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:920)
> the code:
>   public Path getLocalPath(String dirsProp, String path)
>     throws IOException {
>     String[] dirs = getStrings(dirsProp);
>     int hashCode = path.hashCode();
>     FileSystem fs = FileSystem.getNamed("local", this);
>     for (int i = 0; i < dirs.length; i++) {  // try each local dir
>       int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length;
>       Path file = new Path(dirs[index], path);
>       Path dir = file.getParent();
>       if (fs.exists(dir) || fs.mkdirs(dir)) {
>         return file;
>       }
>     }
>     throw new IOException("No valid local directories in property: "+dirsProp);
>   }

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