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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4495) Allow client-side lease renewal to be retried beyond soft-limit
Date Wed, 13 Feb 2013 23:06:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-4495:
-----------------------------

    Fix Version/s: 2.0.4-beta
                   0.23.7

I've committed this to trunk, branch-2 and branch-0.23.
                
> 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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