[HBASE-16003] Compacting memstore related fixes - ASF JIRA

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Will group all the compacting memstore related sub jiras under this parent task.

depends upon

HBASE-14920 Compacting Memstore

1.	NPE in MemstoreCompactor	Closed	ramkrishna.s.vasudevan
2.	CompactingMemstore#InMemoryFlushRunnable should implement Comparable/Comparator	Closed	ramkrishna.s.vasudevan
3.	In-memory Compaction process can be improved for a default case	Closed	Unassigned
4.	Make the number of threads in the IN_MEMORY_COMPACTION_POOL configurable	Closed	Unassigned
5.	Change MemstoreScanner constructor to accept List<KeyValueScanner>	Closed	ramkrishna.s.vasudevan
6.	Correct the config name 'hbase.memestore.inmemoryflush.threshold.factor'	Closed	ramkrishna.s.vasudevan
7.	Compacting Memstore : Few log improvements	Closed	Anoop Sam John
8.	In write heavy scenario creating in memory flushes leads to contention	Closed	Unassigned
9.	Compacting Memstore : unnecessary push of active segments to pipeline	Closed	Anoop Sam John
10.	Compacting Memstore : CompactionPipeline#addFirst can use LinkedList#addFirst	Closed	Anoop Sam John
11.	Missing close of new compacted segments in few occasions which might leak MSLAB chunks from pool	Closed	Anoop Sam John
12.	Create a memstore impl that does not compact but creates pipelines and flushes all segments from pipeline	Closed	Unassigned
13.	Verify the sizing part of Compacting Memstore.	Closed	Unassigned
14.	Create chunk map based flattening	Closed	Unassigned
15.	Cleaning up size and heapSize calculation	Closed	Anoop Sam John