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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4495) Allow client-side lease renewal to be retried beyond soft-limit
Date Wed, 13 Feb 2013 20:12:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13577890#comment-13577890
] 

Daryn Sharp commented on HDFS-4495:
-----------------------------------

+1 Looks like a small reasonable change.  Minor nit is test mentions "has beeb" instead of
"has been".  This should also go into 23, so please add an equivalent patch.
                
> 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
>         Attachments: 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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