[jira] [Commented] (HBASE-4477) Ability for an application to store metadata into the transaction log

["Ted Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113981#comment-13113981 ] 

Ted Yu commented on HBASE-4477:
-------------------------------

{code}
+  public static final String WAL_META_ATTRIBUTE_NAME = "_hbaseWalMetadata";
{code}
Maybe the 'hbase' is not needed in the WAL_META_ATTRIBUTE_NAME.

> 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).

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