anchor.diff:  * hbase.bucketcache.ioengine no longer supports the 'heap' value.
   * hbase.bulkload.staging.dir
   * hbase.balancer.tablesOnMaster wasn't removed, strictly speaking, but its meaning has fundamentally changed and users should not set it. See the section [[upgrade2.0.regions.on.master]] for details.
  +* hbase.master.distributed.log.replay See the section [[upgrade2.0.distributed.log.replay]] for details
  +* hbase.regionserver.disallow.writes.when.recovering See the section [[upgrade2.0.distributed.log.replay]] for details
  +* hbase.regionserver.wal.logreplay.batch.size See the section [[upgrade2.0.distributed.log.replay]] for details
   
   [[upgrade2.0.changed.defaults]]
   .Configuration settings with different defaults in HBase 2.0+
  
positive.code: * hbase.balancer.tablesOnMaster.systemTablesOnly is boolean to keep user tables off master. default false
  * those wishing to replicate old list-of-servers config should deploy a stand-alone RegionServer process and then rely on Region Server Groups
  
  [[upgrade2.0.metrics]]
  .Changed metrics
  
  
negative.code: The following metrics have changed their meaning:
  
  * The metric 'blockCacheEvictionCount' published on a per-region server basis no longer includes blocks removed from the cache due to the invalidation of the hfiles they are from (e.g. via compaction).
  
  The following metrics have been removed:
  
  * Metrics related to the Distributed Log Replay feature are no longer present. They were previsouly found in the region server context under the name 'replay'. See the section [[upgrade2.0.distributed.log.replay]] for details.
  
  [[upgrade2.0.zkconfig]]
  .ZooKeeper configs no longer read from zoo.cfg
  