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From "Stephen Yuan Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13415) Procedure V2 - Use nonces for double submits from client
Date Wed, 08 Jul 2015 05:17:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14617994#comment-14617994
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Stephen Yuan Jiang commented on HBASE-13415:
--------------------------------------------

I run the TestModifyTableProcedure test suite under both maven (mvn) and eclipse - everything
is normal.

> Procedure V2 - Use nonces for double submits from client
> --------------------------------------------------------
>
>                 Key: HBASE-13415
>                 URL: https://issues.apache.org/jira/browse/HBASE-13415
>             Project: HBase
>          Issue Type: Sub-task
>          Components: master
>            Reporter: Enis Soztutar
>            Assignee: Stephen Yuan Jiang
>            Priority: Blocker
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: HBASE-13415.v1-master.patch
>
>
> The client can submit a procedure, but before getting the procId back, the master might
fail. In this case, the client request will fail and the client will re-submit the request.
If 1.1 client or if there is no contention for the table lock, the time window is pretty small,
but still might happen. 
> If the proc was accepted and stored in the procedure store, a re-submit from the client
will add another procedure, which will execute after the first one. The first one will likely
succeed, and the second one will fail (for example in the case of create table, the second
one will throw TableExistsException). 
> One idea is to use client generated nonces (that we already have) to guard against these
cases. The client will submit the request with the nonce and the nonce will be saved together
with the procedure in the store. In case of a double submit, the nonce-cache is checked and
the procId of the original request is returned. 



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