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Date: Thu, 14 Feb 2013 14:06:14 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12632140.1360727296096.288898.1360850774827@arcas>
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Subject: [jira] [Commented] (HDFS-4495) Allow client-side lease renewal to
 be retried beyond soft-limit
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    [ https://issues.apache.org/jira/browse/HDFS-4495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578379#comment-13578379 ] 

Hudson commented on HDFS-4495:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #1344 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1344/])
    HDFS-4495. Allow client-side lease renewal to be retried beyond soft-limit.  Contributed by Kihwal Lee (Revision 1445965)

     Result = SUCCESS
kihwal : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1445965
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/test/java/org/apache/hadoop/hdfs/TestLease.java

                
> Allow client-side lease renewal to be retried beyond soft-limit
> ---------------------------------------------------------------
>
>                 Key: HDFS-4495
>                 URL: https://issues.apache.org/jira/browse/HDFS-4495
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.0.3-alpha, 0.23.5
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 0.23.7, 2.0.4-beta
>
>         Attachments: hdfs-4495.b023.patch, hdfs-4495.patch, hdfs-4495.patch
>
>
> The current lease renewal code in DFSClient gives up after several retries, if the soft limit exceeds. This causes the client to abort.  Without this self destruction behavior, lease renewal can be retried infinitely due to unrelated low-level issue and prevent DFSClient and associated Connection from getting garbage collected.  
> However, giving up at passage of the soft limit has been shown to be too fragile; A long GC on namenode or transient network outage can make clients fail. We need the self-destruct behavior, but clients should be allowed to retry for longer period of time.

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