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dhruba borthakur commented on HBASE-4477: ----------------------------------------- @Andrew: I would like to do this via a co-processor API, can I change the signature of RegionObserver.prePut() to take in two additional arguments: a WALEdit and Put object? If so, shall I mark the existing prePut precessor api as Deprecated? anybody else have any opinions on where to put the code that implements this functionality? One place is org.apache.hadoop.hbase.coprocessor.library.walMetadata. > Ability for an application to store metadata into the transaction log > --------------------------------------------------------------------- > > Key: HBASE-4477 > URL: https://issues.apache.org/jira/browse/HBASE-4477 > Project: HBase > Issue Type: Improvement > Reporter: dhruba borthakur > Assignee: dhruba borthakur > Attachments: hlogMetadata1.txt > > > mySQL allows an application to store an arbitrary blob along with each > transaction in its transaction logs. This JIRA is to have a similar feature > request for HBASE. > The use case is as follows: An application on one data center A stores a blob > of data along with each transaction. A replication software picks up these > blobs from the transaction logs in A and hands it to another instance of the > same application running on a remote data center B. The application in B is > responsible for applying this to the remote Hbase cluster (and also handle > conflict resolution if any). -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira