Optimize flushing of the Store cache for max versions and (new) min versions
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Key: HBASE-4241
URL: https://issues.apache.org/jira/browse/HBASE-4241
Project: HBase
Issue Type: Sub-task
Components: regionserver
Affects Versions: 0.92.0
Reporter: Lars Hofhansl
Priority: Minor
As discussed with with Jon, there is room for improvement in how the memstore
is flushed to disk.
Currently only expired KVs are pruned before flushing, but we can also prune
versions if we find at least maxVersions versions in the memstore.
The same holds for the new minversion feature: If we find at least minVersion
versions in the store we can remove all further versions that are expired.
Generally we should use the same mechanism here that is used for Compaction.
I.e. StoreScanner. We only need to add a scanner to Memstore that can scan
along the current snapshot.
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