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https://issues.apache.org/jira/browse/HDFS-2291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13093285#comment-13093285
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Suresh Srinivas commented on HDFS-2291:
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bq. Will the standby+checkpointing node have to have twice the memory?
No
bq. I thought the main reason for running a secondary namenode on a different
machine was because checkpointing needed just as much memory as the namenode
needed to maintain metadata.
The reason why we do not do it in primary is, checkpointing blocks the
operations.
> HA: Checkpointing in an HA setup
> --------------------------------
>
> Key: HDFS-2291
> URL: https://issues.apache.org/jira/browse/HDFS-2291
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Aaron T. Myers
> Assignee: Todd Lipcon
> Fix For: HA branch (HDFS-1623)
>
>
> We obviously need to create checkpoints when HA is enabled. One thought is to
> use a third, dedicated checkpointing node in addition to the active and
> standby nodes. Another option would be to make the standby capable of also
> performing the function of checkpointing.
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