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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-19216) Implement a general framework to execute remote procedure on RS
Date Thu, 14 Dec 2017 05:50:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-19216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Duo Zhang updated HBASE-19216:
------------------------------
    Attachment: HBASE-19216.patch

Retry.

> 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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