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https://issues.apache.org/jira/browse/HDFS-8326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535129#comment-14535129
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Anu Engineer commented on HDFS-8326:
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> I believe the config key is "txns" not "txn"
Fixed.
> Would be good to put units for the period, which I believe is seconds.
Added
> While we're in this doc, let's remove the "This key metadata item..."
> sentence, since it really dates this doc and is unnecessary.
Done
>The bit about a consistency tradeoff is not quite right. We write to the edit
>log because it's very efficient, more efficient than trying to update the
>fsimage in place. We need to checkpoint to prevent an unbounded number of
>edits, which is bad because it fills up >disks and also delays NN startup time
>since the edits need to be applied to the base fsimage. You might consider
>taking some content from the blog post I wrote:
I was not sure if could copy from your blog, so I re-wrote the same idea in the
documentation and now it is more aligned to what you have expressed in the blog
> Documentation about when checkpoints are run is out of date
> -----------------------------------------------------------
>
> Key: HDFS-8326
> URL: https://issues.apache.org/jira/browse/HDFS-8326
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: documentation
> Affects Versions: 2.3.0
> Reporter: Misty Stanley-Jones
> Assignee: Misty Stanley-Jones
> Attachments: HDFS-8326.patch
>
>
> Apparently checkpointing by interval or transaction size are both supported
> in at least HDFS 2.3, but the documentation does not reflect this.
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