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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19216) Implement a general framework to execute remote procedure on RS
Date Thu, 14 Dec 2017 05:51:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290372#comment-16290372
] 

Hadoop QA commented on HBASE-19216:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  4s{color} | {color:red}
HBASE-19216 does not apply to master. Rebase required? Wrong Branch? See https://yetus.apache.org/documentation/0.6.0/precommit-patchnames
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HBASE-19216 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12902003/HBASE-19216.patch
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| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/10433/console |
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> Implement a general framework to execute remote procedure on RS
> ---------------------------------------------------------------
>
>                 Key: HBASE-19216
>                 URL: https://issues.apache.org/jira/browse/HBASE-19216
>             Project: HBase
>          Issue Type: Sub-task
>          Components: proc-v2, Replication
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>         Attachments: HBASE-19216.patch, HBASE-19216.patch, HBASE-19216.patch
>
>
> When building the basic framework for HBASE-19064, I found that the enable/disable peer
is built upon the watcher of zk.
> The problem of using watcher is that, you do not know the exact time when all RSes in
the cluster have done the change, it is a 'eventually done'. 
> And for synchronous replication, when changing the state of a replication peer, we need
to know the exact time as we can only enable read/write after that time. So I think we'd better
use procedure to do this. Change the flag on zk, and then execute a procedure on all RSes
to reload the flag from zk.
> Another benefit is that, after the change, zk will be mainly used as a storage, so it
will be easy to implement another replication peer storage to replace zk so that we can reduce
the dependency on zk.



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