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https://issues.apache.org/jira/browse/HDFS-11661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HDFS-11661.
------------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 2.8.1
3.0.0-alpha3
Release Note: Reverted HDFS-10797 to fix a scalability regression brought
by the commit.
Based on multiple +1, I reverted the commit from branch-2.8, branch-2 and trunk.
Thanks to [~nroberts] for reporting the issue, and comments from [~kihwal],
[~mackrorysd], [~xiaochen] [~djp] [~andrew.wang] [~shahrs87] [~yzhangal] and
[~daryn].
[~daryn] thanks for your effort trying to fix the bug. Please file a new jira
for your patch. Thanks!
> 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
> Assignee: Wei-Chiu Chuang
> Priority: Blocker
> Fix For: 3.0.0-alpha3, 2.8.1
>
> Attachments: HDFS-11661.001.patch, HDFs-11661.002.patch, 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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