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https://issues.apache.org/jira/browse/HBASE-13996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14702756#comment-14702756
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Liu Shaohui commented on HBASE-13996:
-------------------------------------
[~apurtell]
{quote}
Why 30% less but 50% more?
{quote}
Sorry for not thinking carefully about this.
Patch v3 introduces two configs for lower and upper limit for region number per
server.
The default lower limit is 1.0 and upper limit is 1.5.
> 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, HBASE-13996-v002.diff,
> HBASE-13996-v003.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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