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Date: Tue, 6 Mar 2012 00:19:57 +0000 (UTC)
From: "Kihwal Lee (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=13222821#comment-13222821 ] 

Kihwal Lee commented on HDFS-3032:
----------------------------------

Hold on. The test needs an update. 
                
> 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
>
>
> 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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