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https://issues.apache.org/jira/browse/HBASE-7212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13505187#comment-13505187
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Jonathan Hsieh commented on HBASE-7212:
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https://reviews.apache.org/r/8240/
> Globally Barriered Procedure mechanism
> --------------------------------------
>
> Key: HBASE-7212
> URL: https://issues.apache.org/jira/browse/HBASE-7212
> Project: HBase
> Issue Type: Sub-task
> Components: snapshots
> Affects Versions: hbase-6055
> Reporter: Jonathan Hsieh
> Assignee: Jonathan Hsieh
> Fix For: hbase-6055
>
> Attachments: 121127-global-barrier-proc.pdf
>
>
> This is a simplified version of what was proposed in HBASE-6573. Instead of
> claiming to be a 2pc or 3pc implementation (which implies logging at each
> actor, and recovery operations) this is just provides a best effort global
> barrier mechanism called a Procedure.
> Users need only to implement a methods to acquireBarrier, to act when
> insideBarrier, and to releaseBarrier that use the ExternalException
> cooperative error checking mechanism.
> Globally consistent snapshots require the ability to quiesce writes to a set
> of region servers before a the snapshot operation is executed. Also if any
> node fails, it needs to be able to notify them so that they abort.
> The first cut of other online snapshots don't need the fully barrier but may
> still use this for its error propagation mechanisms.
> This version removes the extra layer incurred in the previous implementation
> due to the use of generics, separates the coordinator and members, and
> reduces the amount of inheritance used in favor of composition.
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