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Date: Tue, 6 Mar 2012 03:08:03 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3032) Lease renewer tries forever even if
 renewal is not possible
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    [ https://issues.apache.org/jira/browse/HDFS-3032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222959#comment-13222959 ] 

Hudson commented on HDFS-3032:
------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #1847 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/1847/])
    HDFS-3032. Change DFSClient.renewLease() so that it only retries up to the lease soft-limit.  Contributed by Kihwal Lee (Revision 1297328)

     Result = FAILURE
szetszwo : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1297328
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/LeaseRenewer.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLease.java

                
> Lease renewer tries forever even if renewal is not possible
> -----------------------------------------------------------
>
>                 Key: HDFS-3032
>                 URL: https://issues.apache.org/jira/browse/HDFS-3032
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.23.0, 0.24.0, 0.23.1
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 0.24.0, 0.23.2, 0.23.3
>
>         Attachments: h3032_20120205.patch, hdfs-3032.patch.txt, hdfs-3032.patch.txt, hdfs-3032.patch.txt, hdfs-3032.patch.txt
>
>
> When LeaseRenewer gets an IOException while attempting to renew for a client, it retries after sleeping 500ms. If the exception is caused by a condition that will never change, it keeps talking to the name node until the DFSClient object is closed or aborted.  With the FileSystem cache, a DFSClient can stay alive for very long time. We've seen the cases in which node managers and long living jobs flooding name node with this type of calls.
> The current proposal is to abort the client when RemoteException is caught during renewal. LeaseRenewer already does abort on all clients when it sees a SocketTimeoutException.

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