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From "Eli Collins (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2736) HA: support separate SBN and 2NN?
Date Sat, 31 Dec 2011 00:21:32 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins resolved HDFS-2736.
-------------------------------

    Resolution: Won't Fix

I was thinking about the case where the former active remains dead for some time. But this
case is problematic for a number of other reasons (eg with just a single host we can't failback
if necessary) so I think its reasonable to require users start another SBN instead also deploying
a 2NN. Closing as won't fix, can re-open if others disagree.
                
> HA: support separate SBN and 2NN?
> ---------------------------------
>
>                 Key: HDFS-2736
>                 URL: https://issues.apache.org/jira/browse/HDFS-2736
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Eli Collins
>
> HDFS-2291 adds support for making the SBN capable of checkpointing, seems like we may
also need to support the 2NN checkpointing as well. Eg if we fail over to the SBN does it
continue to checkpoint? If not the log grows unbounded until the old primary comes back, if
so does that create performance problems since the primary wasn't previously checkpointing?

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