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https://issues.apache.org/jira/browse/HDFS-10480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020393#comment-16020393
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Andrew Wang commented on HDFS-10480:
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I'll review this shortly.
bq. I never understand the need to check twice for
checkOperation(OperationCategory.READ). It is all over namenode code.
The issue is that the NN can go from being active to standby between the two
checks. While the FSN lock is held, it will not transition HA state. The second
check is sufficient for correctness, but the first one helps as an early-exit
for performance.
> Add an admin command to list currently open files
> -------------------------------------------------
>
> Key: HDFS-10480
> URL: https://issues.apache.org/jira/browse/HDFS-10480
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Kihwal Lee
> Assignee: Manoj Govindassamy
> Attachments: HDFS-10480.02.patch, HDFS-10480.03.patch,
> HDFS-10480.04.patch, HDFS-10480-trunk-1.patch, HDFS-10480-trunk.patch
>
>
> Currently there is no easy way to obtain the list of active leases or files
> being written. It will be nice if we have an admin command to list open files
> and their lease holders.
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