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https://issues.apache.org/jira/browse/HBASE-13996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608453#comment-14608453
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stack commented on HBASE-13996:
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It looks nice. Should there be a flag to enable the writes? Maybe not if you
update the doc on Canary to explain this new write dimension. Add a config for
how many regions per regionserver? Default 1 instead of 3? Some folks might
get freaked if they started seeing a table named 'canary' with three empty
regions per server show up on their cluster. Nice one.
> Add write sniffing in canary
> ----------------------------
>
> Key: HBASE-13996
> URL: https://issues.apache.org/jira/browse/HBASE-13996
> Project: HBase
> Issue Type: New Feature
> Components: canary
> Affects Versions: 0.98.13, 1.1.0.1
> Reporter: Liu Shaohui
> Assignee: Liu Shaohui
> Fix For: 2.0.0, 0.98.14, 1.1.1, 1.1.2
>
> 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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