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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8136) coprocessor service requires .meta. to be available all the time.
Date Mon, 18 Mar 2013 16:12:16 GMT
nkeywal created HBASE-8136:
------------------------------

             Summary: coprocessor service requires .meta. to be available all the time.
                 Key: HBASE-8136
                 URL: https://issues.apache.org/jira/browse/HBASE-8136
             Project: HBase
          Issue Type: Bug
          Components: Client, Coprocessors
    Affects Versions: 0.96.0
            Reporter: nkeywal
            Priority: Minor



HTable#getRegionLocations does not use a cache: all the calls to this function go to .META.

So:
- we're missing an opportunity to reuse/update the location cache in the HConnection.
- this method is called by the coprocessor service. So, for people using this features, they
have .meta. on their execution path, and it's not good for performances, scalability and reliability.

I'm not totally clear on the fix. I think it should be possible to use the cache to see if
we have all regions for the table. But it means we won't always have the last version when
calling getRegionLocations.

Any thought on this?

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