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Date: Fri, 16 Nov 2012 22:37:13 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <295852503.126147.1353105433214.JavaMail.jiratomcat@arcas>
Subject: [jira] [Updated] (HBASE-2645) HLog writer can do 1-2 sync
 operations after lease has been recovered for split process.
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     [ https://issues.apache.org/jira/browse/HBASE-2645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-2645:
-------------------------

    Status: Patch Available  (was: Reopened)
    
> HLog writer can do 1-2 sync operations after lease has been recovered for split process.
> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-2645
>                 URL: https://issues.apache.org/jira/browse/HBASE-2645
>             Project: HBase
>          Issue Type: Bug
>          Components: Filters
>    Affects Versions: 0.90.4
>            Reporter: Cosmin Lehene
>            Assignee: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.96.0
>
>         Attachments: 2645_hacking.txt, 2645.txt, 2645v2.txt, 2645v3.txt, 2645v4.txt, hdfs_1.0_editswriter_recoverlease.txt, hdfs_trunk_editswriter_recoverlease.txt, org.apache.hadoop.hbase.regionserver.wal.TestHLogSplit-output.txt, org.apache.hadoop.hbase.regionserver.wal.TestHLogSplit-output.txt
>
>
> TestHLogSplit.testLogCannotBeWrittenOnceParsed is failing. 
> This test starts a thread that writes one edit to the log, syncs and counts. During this, a HLog.splitLog operation is started. splitLog recovers the log lease before reading the log, so that the original regionserver could not wake up and write after the split process started.  
> The test compares the number of edits reported by the split process and by the writer thread. Writer thread (called zombie in the test) should report <=  than the splitLog (sync() might raise after the last edit gets written and the edit won't get counted by zombie thread). However it appears that the zombie counts 1-2 more edits. So it looks like it can sync without a lease.
> This might be a hdfs-0.20 related issue. 

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