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Date: Tue, 4 Jun 2013 01:30:20 +0000 (UTC)
From: "Enis Soztutar (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12650404.1370037294238.61291.1370309420447@arcas>
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Subject: [jira] [Commented] (HBASE-8670) [0.94] Backport HBASE-8449 and
 HBASE-8204 to 0.94 (Refactor recoverLease retries and pauses)
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    [ https://issues.apache.org/jira/browse/HBASE-8670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673913#comment-13673913 ] 

Enis Soztutar commented on HBASE-8670:
--------------------------------------

By 0.94, we are not supporting pre-1 hadoop's. However, isFileClosed() only comes with 1.2, and we should still support 1.0.x and 1.1.x. 

                
> [0.94] Backport HBASE-8449 and HBASE-8204 to 0.94 (Refactor recoverLease retries and pauses)
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8670
>                 URL: https://issues.apache.org/jira/browse/HBASE-8670
>             Project: HBase
>          Issue Type: Bug
>          Components: Filesystem Integration, master, wal
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.94.9
>
>         Attachments: hbase-8670_v1.patch
>
>
> Some history: 
>  Up until 0.94.8, Hbase did not check the result of recoverLease() call, but things kind of worked since we are checking for 0-length files in distributed log split tasks from region servers. If lease recovery is not finished, the log file will report 0 length, and the task will fail, and master will then re-call recoverLease() and reassign the task. This scheme might fail for log files that are larger than 1 hdfs block though. 
>  In 0.94.8, we committed (HBASE-8354, which is backport of HBASE-7878) and later increased the sleep time to 4 secs in HBASE-8389. 
>  However, the proper solution arrived in trunk in HBASE-8449 which uses a backoff sleep policy + isFileClosed() api. We should backport this patch to 0.94 as well. 
> isFileClosed() is released in Hadoop 1.2.0 (HDFS-4774) and 2.0.5(HDFS-4525).

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