HDP 2.2.6 provides HBase 0.98.4 and the following addtional Apache patches:
HBASE-212: Addendum. Fixes a unit test
HBASE-10499: In write-heavy scenario one of the regions does not get flushed causing RegionTooBusyException
HBASE-11569: Addendum for not skipping replayed edits for primary region replica
HBASE-12238: A few exceptions on startup - PARTIAL BACKPORT
HBASE-12533: staging directories are not deleted after secure bulk load
HBASE-12575: Sanity check table coprocessor classes are loadable
HBASE-12536: Reduce the effective scope of GLOBAL CREATE and ADMIN permission
HBASE-12562: Handling memory pressure for secondary region replicas - ADDENDUM for fixing findbug reported issues
HBASE-12791: HBase does not attempt to clean up an aborted split when the regionserver shutting down
HBASE-12714: RegionReplicaReplicationEndpoint should not set the RPC Codec
HBASE-12958: SSH doing hbase:meta get but hbase:meta not assigned
HBASE-13120: Allow disabling hadoop classpath and native library lookup
