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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6762) exception while doing RPC I/O closes channel
Date Wed, 25 Aug 2010 22:57:17 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902692#action_12902692
] 

Todd Lipcon commented on HADOOP-6762:
-------------------------------------

I think we just need this fix to the gridmix test:
{quote}
--- a/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/JobMonitor.java
+++ b/src/contrib/gridmix/src/java/org/apache/hadoop/mapred/gridmix/JobMonitor.java
@@ -177,7 +177,8 @@ class JobMonitor implements Gridmix.Component<Job> {
                 continue;
               }
             } catch (IOException e) {
-              if (e.getCause() instanceof ClosedByInterruptException) {
+              if (e.getCause() instanceof ClosedByInterruptException ||
+                  e.getCause() instanceof InterruptedException) {
                 // Job doesn't throw InterruptedException, but RPC socket layer
                 // is blocking and may throw a wrapped Exception if this thread
                 // is interrupted. Since the lower level cleared the flag,
{quote}

> exception while doing RPC I/O closes channel
> --------------------------------------------
>
>                 Key: HADOOP-6762
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6762
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.20.2
>            Reporter: sam rash
>            Assignee: sam rash
>         Attachments: hadoop-6762-1.txt, hadoop-6762-2.txt, hadoop-6762-3.txt, hadoop-6762-4.txt,
hadoop-6762-6.txt, hadoop-6762-7.txt, hadoop-6762-8.txt, hadoop-6762-9.txt
>
>
> If a single process creates two unique fileSystems to the same NN using FileSystem.newInstance(),
and one of them issues a close(), the leasechecker thread is interrupted.  This interrupt
races with the rpc namenode.renew() and can cause a ClosedByInterruptException.  This closes
the underlying channel and the other filesystem, sharing the connection will get errors.

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