Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm
Precedence: bulk
Date: Thu, 5 Sep 2013 01:12:52 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12652565.1371101563923.82359.1378343572366@arcas>
In-Reply-To: <JIRA.12652565.1371101563923@arcas>
References: <JIRA.12652565.1371101563923@arcas>
Subject: [jira] [Updated] (HBASE-8741) Scope sequenceid to the region rather
 than regionserver (WAS: Mutations on Regions in recovery mode might have
 same sequenceIDs)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


     [ https://issues.apache.org/jira/browse/HBASE-8741?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-8741:
-------------------------

    Fix Version/s:     (was: 0.96.0)
    
> Scope sequenceid to the region rather than regionserver (WAS: Mutations on Regions in recovery mode might have same sequenceIDs)
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8741
>                 URL: https://issues.apache.org/jira/browse/HBASE-8741
>             Project: HBase
>          Issue Type: Bug
>          Components: MTTR
>    Affects Versions: 0.95.1
>            Reporter: Himanshu Vashishtha
>            Assignee: Himanshu Vashishtha
>             Fix For: 0.98.0
>
>         Attachments: HBASE-8741-v0.patch, HBASE-8741-v2.patch, HBASE-8741-v3.patch, HBASE-8741-v4-again.patch, HBASE-8741-v4-again.patch, HBASE-8741-v4.patch, HBASE-8741-v5-again.patch, HBASE-8741-v5.patch
>
>
> Currently, when opening a region, we find the maximum sequence ID from all its HFiles and then set the LogSequenceId of the log (in case the later is at a small value). This works good in recovered.edits case as we are not writing to the region until we have replayed all of its previous edits. 
> With distributed log replay, if we want to enable writes while a region is under recovery, we need to make sure that the logSequenceId > maximum logSequenceId of the old regionserver. Otherwise, we might have a situation where new edits have same (or smaller) sequenceIds. 
> We can store region level information in the WALTrailer, than this scenario could be avoided by:
> a) reading the trailer of the "last completed" file, i.e., last wal file which has a trailer and,
> b) completely reading the last wal file (this file would not have the trailer, so it needs to be read completely).
> In future, if we switch to multi wal file, we could read the trailer for all completed WAL files, and reading the remaining incomplete files.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira