[
https://issues.apache.org/jira/browse/HDFS-1064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849530#action_12849530
]
dhruba borthakur commented on HDFS-1064:
----------------------------------------
> Could someone comment on how the BackupNameNode (BNN) differs from the
> AvatarNode (AN) that Dhruba is proposing?
The BackupNameNode (as it stands now) consumes the transaction logs from the
primary NN. But it does not have block locations associated with each block.
Thus, the failover time could be large. The AvatarNode is a hot-standby, and I
have measured failover times (with 10 million files) of 10 seconds in a test
cluster. (But, of course, the BackupNode could be extended in future to support
hot standby)
> NN Availability - umbrella Jira
> -------------------------------
>
> Key: HDFS-1064
> URL: https://issues.apache.org/jira/browse/HDFS-1064
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Sanjay Radia
>
> This is an umbrella jira for discussing availability of the HDFS NN and
> providing references to other Jiras that improve its availability. This
> includes, but is not limited to, automatic failover.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
