Using HBase 0.98, ustat estimateRowCount() returns 0

[Barry Fritchman]

Update Statistics calls estimateRowCount() for HBase tables rather than executing a count(*) query. Since moving to HBase 0.98, this function always returns 0, which causes the more expensive count(*) to be used.

[Trafodion-Gerrit (neo-devtools)]

Fix proposed to branch: master
Review: https://review.trafodion.org/569

[Trafodion-Gerrit (neo-devtools)]

Reviewed: https://review.trafodion.org/569
Committed: https://github.com/trafodion/core/commit/375d87ed43786102db9dc4c4f4bc708d35d38c08
Submitter: Trafodion Jenkins
Branch: master

commit 375d87ed43786102db9dc4c4f4bc708d35d38c08
Author: Barry Fritchman <email address hidden>
Date: Wed Oct 15 21:40:40 2014 +0000

    Use new HFIle location for HBase 0.98

    The code to lookup the HFiles for a given table was changed
    to accommodate their new location within the HDFS file system.
    The location seems to have changed at some point between 0.94
    and 0.98, although I could find no documentation of the change,
    nor any HBase property that could be used to identify the
    path to the filesystem node under which HFiles for tables
    are stored. This change affects lookup of HFiles for the purpose
    of estimating the number of rows in a table.

    Change-Id: I17b892144c03a2e9cebd3de22838177ffb6a324d
    Closes-Bug: 1379862