HBASE-6626 Add a chapter on HDFS in the troubleshooting section of the HBase reference guide (Misty Stanley-Jones)
HBASE-11678 BucketCache ramCache fills heap after running a few hours
HBASE-11697 Improve the 'Too many blocks' message on UI blockcache status page (Mikhail Antonov)
HBASE-11701 Start and end of memstore flush log should be on the same level (Esteban Gutierrez)