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https://issues.apache.org/jira/browse/HDFS-4185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535788#comment-14535788
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Ravi Prakash commented on HDFS-4185:
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Hi Rakesh! Thanks for your work! :-)
There's an issue though. The way leases are granted is as follows
# A client requests for a lease
# This lease could be for several files. (Yes! One lease to write multiple
files)
# There could be multiple clients (Obviously they have to be writing different
files)
So your getNumActiveLeases() is actually returning number of files open for
write (which is >= number of active leases)
> Add a metric for number of active leases
> ----------------------------------------
>
> Key: HDFS-4185
> URL: https://issues.apache.org/jira/browse/HDFS-4185
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 0.23.4, 2.0.2-alpha
> Reporter: Kihwal Lee
> Assignee: Rakesh R
> Labels: BB2015-05-TBR
> Attachments: HDFS-4185-001.patch, HDFS-4185-002.patch,
> HDFS-4185-003.patch, HDFS-4185-004.patch, HDFS-4185-005.patch
>
>
> We have seen cases of systematic open file leaks, which could have been
> detected if we have a metric that shows number of active leases.
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