[jira] [Created] (HBASE-13199) Some small improvements on canary tool

["Liu Shaohui (JIRA)" <ji...@apache.org>]

Liu Shaohui created HBASE-13199:
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             Summary: Some small improvements on canary tool
                 Key: HBASE-13199
                 URL: https://issues.apache.org/jira/browse/HBASE-13199
             Project: HBase
          Issue Type: Improvement
            Reporter: Liu Shaohui
            Assignee: Liu Shaohui


Improvements
- Make the sniff of region and regionserver parallel to support large cluster with 10000+ region and 500+ regionservers using thread pool.
- Set cacheblock to false in get and scan to avoid influence to block cache.
- Add FirstKeyOnlyFilter to get and scan to avoid read and translate too many data from HBase. There may be many column under a column family in a flat-wide table.
 - random select the region when sniffing a regionserver.

[~stack]

Suggestions are welcomed. Thanks~

Another question is that why to check each column family with separate requests when sniffing a region? Can we just check a  column family of a region?



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