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https://issues.apache.org/jira/browse/HDFS-3409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273638#comment-13273638
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Aaron T. Myers commented on HDFS-3409:
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Hi Hitesh,
bq. I would defer to anyone who is more well versed with HDFS to make a call on
where it makes sense to expose this information for 1.x ( whether it is in the
namenode if it tracks the last checkpoint time or do it separately in each SNN
given that multiple SNNs are supported
What gives you the impression that running multiple Secondary NameNodes is
supported? I don't know of any deployments that consciously choose to run
multiple 2NNs, and it's not a configuration that HDFS is designed to support,
in my experience.
Given that, putting this info on the NN makes more sense to me.
> Secondary namenode should expose checkpoint info via JMX
> --------------------------------------------------------
>
> Key: HDFS-3409
> URL: https://issues.apache.org/jira/browse/HDFS-3409
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 1.0.2
> Reporter: Hitesh Shah
>
> Information such as when the last checkpoint was done should be exposed via
> JMX so that it can be easily queried via scripts.
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