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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7212) Globally Barriered Procedure mechanism
Date Thu, 22 Nov 2012 19:08:57 GMT
Jonathan Hsieh created HBASE-7212:
-------------------------------------

             Summary: 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
             Fix For: hbase-6055


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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