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From "Dylan Hutchison (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3206) New Public API: Approximate data counts of Tablets and Tablet Servers
Date Sun, 05 Oct 2014 02:45:33 GMT
Dylan Hutchison created ACCUMULO-3206:
-----------------------------------------

             Summary: New Public API: Approximate data counts of Tablets and Tablet Servers
                 Key: ACCUMULO-3206
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3206
             Project: Accumulo
          Issue Type: New Feature
          Components: client, monitor
    Affects Versions: 1.6.1
            Reporter: Dylan Hutchison
            Priority: Minor


The broader picture is public programmatic access to information in the Accumulo monitor.
 Specifically I'm looking to obtain the number of entries per tablet and per tablet server
for a given table.  The use case is to verify that manually set (or automatically set I suppose)
table splits are effectively dividing Accumulo data among many tablets, that is, verifying
load balancing.

I wrote Accumulo 1.5 code which uses non-public API to obtain this information in the same
way the Monitor does via TabletStats. The tricky part was cross-referencing the Metadata table
to find the assignment of tablets to tablet servers for a given table.  I rewrote that code
for 1.6, switching the name of the Metadata table to "accumulo.metadata" and other associated
changes, but it would be great to make this part of the public API so that people don't have
to use non-public methods to obtain data that Accumulo has in the Monitor and Metadata table
anyway.

We could approach this by adding to the TableOperations class or something similar.  A request
could go to an Accumulo master which gathers the necessary information from the tablet servers
just as the Monitor does, so that the client does not have to do it.



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