Optimize codepath for minor compactions
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Key: HBASE-1521
URL: https://issues.apache.org/jira/browse/HBASE-1521
Project: Hadoop HBase
Issue Type: Improvement
Affects Versions: 0.20.0
Reporter: Jonathan Gray
Fix For: 0.20.1
There are some additional optimizations in the specialized StoreScanner and
also in HFile for minor compactions. For example, there is some KV
disassembling and sanity checking in HFile even though in a minor compaction
these checks have already been run during the flush.
Another area to discuss is whether we should actually process deletes during
minor compactions. It's not especially expensive (ScanDeleteTracker is quite
simple) but it requires looking at both the row and the qualifier value of
every single KV. Removing this would drop our axiom that "Deletes only apply
to later storefiles", which is used during Get processing to have more
efficient delete handling.
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