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Date: Thu, 3 Jun 2010 17:31:57 -0400 (EDT)
From: "sam rash (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1142) Lease recovery doesn't reassign lease
 when triggered by append()
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    [ https://issues.apache.org/jira/browse/HDFS-1142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12875303#action_12875303 ] 

sam rash commented on HDFS-1142:
--------------------------------

a small sidenote:

re: killing writers, it does so *after* getting metadata, so there is still a window under which the client could start another lease recovery, it would complete, and it could start writing and call sync.  the 1st lease recovery kills threads, then truncate the block (based on the first set of lengths).  This violates sync/hflush semantics.  I don't know if there's a jira for this, but I had planned to make the change so the writers *are* killed first thing before getting meta-data.


> Lease recovery doesn't reassign lease when triggered by append()
> ----------------------------------------------------------------
>
>                 Key: HDFS-1142
>                 URL: https://issues.apache.org/jira/browse/HDFS-1142
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.21.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-1142.txt, hdfs-1142.txt
>
>
> If a soft lease has expired and another writer calls append(), it triggers lease recovery but doesn't reassign the lease to a new owner. Therefore, the old writer can continue to allocate new blocks, try to steal back the lease, etc. This is for the testRecoveryOnBlockBoundary case of HDFS-1139

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