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From "Liu Shaohui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13996) Add write sniffing in canary
Date Thu, 13 Aug 2015 02:08:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14694559#comment-14694559
] 

Liu Shaohui commented on HBASE-13996:
-------------------------------------

[~stack] [~apurtell]
Sorry for leaving the issue here so long.
I will update the patch according stack's review in few days.


> Add write sniffing in canary
> ----------------------------
>
>                 Key: HBASE-13996
>                 URL: https://issues.apache.org/jira/browse/HBASE-13996
>             Project: HBase
>          Issue Type: Improvement
>          Components: canary
>    Affects Versions: 0.98.13, 1.1.0.1
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>             Fix For: 2.0.0, 1.3.0, 0.98.15
>
>         Attachments: HBASE-13996-v001.diff
>
>
> Currently the canary tool only sniff the read operations, it's hard to finding the problem
in write path. 
> To support the write sniffing, we create a system table named '_canary_'  in the canary
tool. And the tool will make sure that the region number is large than the number of the regionserver
and the regions will be distributed onto all regionservers.
> Periodically, the tool will put data to these regions to calculate the write availability
of HBase and send alerts if needed.



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