Support Questions
Find answers, ask questions, and share your expertise
Alert: Welcome to the Unified Cloudera Community. Former HCC members be sure to read and learn how to activate your account here.

re-establish BDR replication job after PROD is back from maintenance


re-establish BDR replication job after PROD is back from maintenance



quick question about BDR scenario, where there is a prod cluster A and a DR cluster B.

Normal operation is A ==> B (HDFS & Hive replication). Now cluster A requires a shutdown due to maintenance, but outside applications need a cluster to talk to, thereby DR cluster B is being promoted to "prod" while cluster A is undergoing maintenance.

After maintenance is finished, cluster A comes back and needs to be promoted back to "prod".

Since all the data which came into cluster B (while it was the "prod" and cluster A was down) will be replayed to cluster A, the question is:

Is it now possible to simply start up the replication jobs which were in place in the beginning (replicating from A ==> B) and replication will continue to run ? ... although on cluster B the first bunch of data which will get replicated is already there (because it is the data which was ingested during maintenance of cluster A).
Means, do the replication jobs simply overwrite (duplicate) data on the target ???


For HDFS, since it is _distcp_ , there is the option to set _overwrite_ explicitly, hence this shouldn't be a problem...What about Hive ?


Thanks in advance

Don't have an account?
Coming from Hortonworks? Activate your account here