Allan Yang created HBASE-21041:
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Summary: Memstore's heap size will be decreased to minus zero
after flush
Key: HBASE-21041
URL: https://issues.apache.org/jira/browse/HBASE-21041
Project: HBase
Issue Type: Bug
Affects Versions: 2.0.1, 2.1.0
Reporter: Allan Yang
Assignee: Allan Yang
When creating an active mutable segment (MutableSegment) in memstore,
MutableSegment's deep overheap (208 bytes) was added to its heap size, but not
to the region's memstore's heap size. And so was the immutable
segment(CSLMImmutableSegment) which the mutable segment turned into (additional
8 bytes ) later. So after one flush, the memstore's heapsize will be decreased
to -216 bytes, The minus number will accumulate after every flush.
CompactingMemstore has this problem too.
We need to record the overhead for CSLMImmutableSegment and MutableSegment to
the corresponding region's memstore size.
For CellArrayImmutableSegment, CellChunkImmutableSegment and
CompositeImmutableSegment , it is not necessary to do so, because inside
CompactingMemstore, the overheads are already be taken care of when transfer a
CSLMImmutableSegment into them.
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