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From "Liyin Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10275) [89-fb] Guarantee the sequenceID in each Region is strictly monotonic increasing
Date Sat, 04 Jan 2014 05:04:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13862208#comment-13862208
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Liyin Tang commented on HBASE-10275:
------------------------------------

The problem you have described is exactly what we want to resolve. Basically if the sequenceID
for each region is strictly monotonic increasing, then in the case of a region moving from
A to B, the replication stream in B would know the gap/lag for that region in the previous
replication stream A. 

As you mentioned but slightly different:  The fix is to guarantee the old hlog entries of
a region from the previous region server been fully replicated, before starting to replicate
this region from a new region server.

> [89-fb] Guarantee the sequenceID in each Region is strictly monotonic increasing
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-10275
>                 URL: https://issues.apache.org/jira/browse/HBASE-10275
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Liyin Tang
>            Assignee: Liyin Tang
>
> [HBASE-8741] has implemented the per-region sequence ID. It would be even better to guarantee
that the sequencing is strictly monotonic increasing so that HLog-Based Async Replication
is able to delivery transactions in order in the case of region movements.  



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