Jonathan Hsieh created HBASE-7212:
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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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