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Date: Fri, 5 Dec 2014 02:50:12 +0000 (UTC)
From: "Liu Shaohui (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12759415.1417697471000.80512.1417747812469@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-12636) Avoid too many write operations on
 zookeeper in replication
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    [ https://issues.apache.org/jira/browse/HBASE-12636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14234974#comment-14234974 ] 

Liu Shaohui commented on HBASE-12636:
-------------------------------------

[~apurtell]
{quote}
What about recording this information into a system table instead? We can start the migration of replication state out of ZooKeeper. 
{quote}
Agree. We may start to work on it in next month.

> Avoid too many write operations on zookeeper in replication
> -----------------------------------------------------------
>
>                 Key: HBASE-12636
>                 URL: https://issues.apache.org/jira/browse/HBASE-12636
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.94.11
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>              Labels: replication
>             Fix For: 1.0.0
>
>         Attachments: HBASE-12636-v1.diff
>
>
> In our production cluster, we found there are about over 1k write operations per second on zookeeper from hbase replication. The reason is that the replication source will write the log position to zookeeper for every edit shipping. If the current replicating WAL is just the WAL that regionserver is writing to,  each skipping will be very small but the frequency is very high, which causes many write operations on zookeeper.
> A simple solution is that writing log position to zookeeper when position diff or skipped edit number is larger than a threshold, not every  edit shipping.
> Suggestions are welcomed, thx~


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