What is an efficient way move/copy data from CDH 5.x [HBase 1. x] cluster to CDH6.x [HBase 2.x] cluster?

[#1]

There are several options available to achieve this use case. The easiest and the best approach would be HBase snapshots method to transfer the data. 

Note: All actions need to be performed as the HBase user only, to ensure correct permissions.

1. On source cluster:

   #hbase shell> snapshot ‘Test’_Table’, ‘Test_Table_SS’
   
   #hbase org.apache.hadoop.hbase.snapshot.SnapshotInfo -snapshot ‘Test_Table_SS’ -files -stats 
   
   #hbase org.apache.hadoop.hbase.snapshot.ExportSnapshot -snapshot 'Test_Table_SS' -copy-to hdfs://<Destination_NN_hostname>:8020/hbase -mappers 16 -bandwidth 200

2. On destination cluster:

   #hbase org.apache.hadoop.hbase.snapshot.SnapshotInfo -snapshot ‘Test_Table_SS’ -files -stats
   
   #hbase shell> clone_snapshot ‘Test_Table_SS’, ‘Test_Table’
   
   #hbase shell> major_compact 'Test_Table'

3. Once done, you can choose to delete the snapshots on both ms05 and as05:

   #hbase shell> delete_snapshot 'Test_Table_SS'​

4. But If you plan to use CopyTable, this will not work without additional configuration.

Communication between an older client and a newer server is not guaranteed, there is currently a workaround to allow this to work by adding the following property to your client configuration:

On the client being used to launch the CopyTable, you can do either:

Command Line:

-Dhbase.meta.replicas.use=true

OR

hbase-site.xml:

hbase.meta.replicas.use

true