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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9465) Push entries to peer clusters serially
Date Tue, 02 Aug 2016 07:02:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15403507#comment-15403507
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Duo Zhang commented on HBASE-9465:
----------------------------------

Also +1 on v3.

[~stack] [~lhofhansl] [~enis] Any concerns?

Thanks.

> Push entries to peer clusters serially
> --------------------------------------
>
>                 Key: HBASE-9465
>                 URL: https://issues.apache.org/jira/browse/HBASE-9465
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver, Replication
>            Reporter: Honghua Feng
>            Assignee: Phil Yang
>         Attachments: HBASE-9465-v1.patch, HBASE-9465-v2.patch, HBASE-9465-v2.patch, HBASE-9465-v3.patch,
HBASE-9465.pdf
>
>
> When region-move or RS failure occurs in master cluster, the hlog entries that are not
pushed before region-move or RS-failure will be pushed by original RS(for region move) or
another RS which takes over the remained hlog of dead RS(for RS failure), and the new entries
for the same region(s) will be pushed by the RS which now serves the region(s), but they push
the hlog entries of a same region concurrently without coordination.
> This treatment can possibly lead to data inconsistency between master and peer clusters:
> 1. there are put and then delete written to master cluster
> 2. due to region-move / RS-failure, they are pushed by different replication-source threads
to peer cluster
> 3. if delete is pushed to peer cluster before put, and flush and major-compact occurs
in peer cluster before put is pushed to peer cluster, the delete is collected and the put
remains in peer cluster
> In this scenario, the put remains in peer cluster, but in master cluster the put is masked
by the delete, hence data inconsistency between master and peer clusters



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