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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-7212) Globally Barriered Procedure mechanism
Date Wed, 26 Dec 2012 01:12:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13539447#comment-13539447
] 

Ted Yu edited comment on HBASE-7212 at 12/26/12 1:10 AM:
---------------------------------------------------------

I encountered some error submitting review comments on review board.
The following two new methods can be declared package private:
{code}
public static void waitForLatch(CountDownLatch latch, ForeignExceptionSnare monitor,
{code}
{code}
  public Procedure createProcedure(ForeignExceptionDispatcher fed, String procName, byte[]
procArgs,
{code}
Can we use MapMaker from Guava so that we don't need to introduce WeakValueMapping class ?
See CorpocessorHost.java for an example.
                
      was (Author: yuzhihong@gmail.com):
    I encountered some error submitting review comments.
The following two new methods can be declared package private:
{code}
public static void waitForLatch(CountDownLatch latch, ForeignExceptionSnare monitor,
{code}
{code}
  public Procedure createProcedure(ForeignExceptionDispatcher fed, String procName, byte[]
procArgs,
{code}
                  
> 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, hbase-7212.patch, hbase-7212.v5.patch,
pre-hbase-7212.patch, pre-hbase-7212.v5.patch
>
>
> 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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