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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4495) Allow client-side lease renewal to be retried beyond soft-limit
Date Thu, 14 Feb 2013 13:06:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13578337#comment-13578337
] 

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

Integrated in Hadoop-Hdfs-trunk #1316 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1316/])
    HDFS-4495. Allow client-side lease renewal to be retried beyond soft-limit.  Contributed
by Kihwal Lee (Revision 1445965)

     Result = FAILURE
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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