Remove the metrics in method to avoid the NPE.
Merge branch 'hbase-11339-metrics' of https://github.com/JingchengDu/hbase into hbase-11339-metrics
Improve the implementation.
Merge remote-tracking branch 'origin/hbase-11339-core' into hbase-11339-core-compaction
change the Bytes.SIZEOF_LONG to Bytes.SIZEOF_INT.
Merge remote-tracking branch 'origin/hbase-11339-core-compaction' into hbase-11339-metrics
Merge remote-tracking branch 'origin/hbase-11339-metrics' into hbase-11339-all