Ensure that compactions use already cached blocks but do not cache new data
blocks
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Key: HBASE-5375
URL: https://issues.apache.org/jira/browse/HBASE-5375
Project: HBase
Issue Type: Test
Reporter: Mikhail Bautin
Create a unit test to verify that compactions reuse existing cached blocks but
do not thrash the cache with newly read blocks. Also need to verify that we
only read every data block once, e.g. that we don't re-read the block on every
next() operation. HBASE-1597 did not seem to include a unit test, so we need to
add a test now. This and HBASE-4683 (the unit test that was not checked in) are
the remaining missing pieces before we can close HBASE-3976.
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