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https://issues.apache.org/jira/browse/HDFS-11661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15979508#comment-15979508
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Junping Du commented on HDFS-11661:
-----------------------------------
Thanks [~nroberts] and all for reporting the issue. +1 on reverting HDFS-10797
if we don't have a quick fix here. Just pinged the patch authors of HDFS-10797
to see if any magic can happen in short term. :)
> GetContentSummary uses excessive amounts of memory
> --------------------------------------------------
>
> Key: HDFS-11661
> URL: https://issues.apache.org/jira/browse/HDFS-11661
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.8.0, 3.0.0-alpha2
> Reporter: Nathan Roberts
> Priority: Blocker
> Attachments: Heap growth.png
>
>
> ContentSummaryComputationContext::nodeIncluded() is being used to keep track
> of all INodes visited during the current content summary calculation. This
> can be all of the INodes in the filesystem, making for a VERY large hash
> table. This simply won't work on large filesystems.
> We noticed this after upgrading a namenode with ~100Million filesystem
> objects was spending significantly more time in GC. Fortunately this system
> had some memory breathing room, other clusters we have will not run with this
> additional demand on memory.
> This was added as part of HDFS-10797 as a way of keeping track of INodes that
> have already been accounted for - to avoid double counting.
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