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https://issues.apache.org/jira/browse/HBASE-9465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Phil Yang updated HBASE-9465:
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Release Note:
Now in replication we can make sure the order of pushing logs is same as the
order of requests from client. Set REPLICATION_SCOPE=2 at one cf's
configuration to enable this feature.
This feature relies on zk-less assignment, and conflicts with distributed log
replay. So users must set hbase.assignment.usezk and
hbase.master.distributed.log.replay to false to support this feature.
> 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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