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Date: Wed, 17 Feb 2016 00:12:18 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12841977.1435753971000.66236.1455667938404@Atlassian.JIRA>
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 <JIRA.12841977.1435753971889@arcas>
Subject: [jira] [Commented] (HBASE-14004) [Replication] Inconsistency
 between Memstore and WAL may result in data in remote cluster that is not
 in the origin
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    [ https://issues.apache.org/jira/browse/HBASE-14004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149552#comment-15149552 ] 

stack commented on HBASE-14004:
-------------------------------

But, as noted elsewhere, this fact does not solve this issue (what made it into the stream..)

> [Replication] Inconsistency between Memstore and WAL may result in data in remote cluster that is not in the origin
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-14004
>                 URL: https://issues.apache.org/jira/browse/HBASE-14004
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: He Liangliang
>            Priority: Critical
>              Labels: replication, wal
>
> Looks like the current write path can cause inconsistency between memstore/hfile and WAL which cause the slave cluster has more data than the master cluster.
> The simplified write path looks like:
> 1. insert record into Memstore
> 2. write record to WAL
> 3. sync WAL
> 4. rollback Memstore if 3 fails
> It's possible that the HDFS sync RPC call fails, but the data is already  (may partially) transported to the DNs which finally get persisted. As a result, the handler will rollback the Memstore and the later flushed HFile will also skip this record.


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