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https://issues.apache.org/jira/browse/HDDS-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16955756#comment-16955756
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Lokesh Jain commented on HDDS-2328:
-----------------------------------
Currently we do not implement FileSystem#listLocatedStatus api in Ozone.
Therefore it ends up calling listStatus for the entire directory at once which
can lead to OOM. I think we just need to have an implementation for
listLocatedStatus and other such related apis in BasicOzoneFileSystem.
> Support large-scale listing
> ----------------------------
>
> Key: HDDS-2328
> URL: https://issues.apache.org/jira/browse/HDDS-2328
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
> Reporter: Rajesh Balamohan
> Assignee: Hanisha Koneru
> Priority: Major
> Labels: performance
>
> Large-scale listing of directory contents takes a lot longer time and also
> has the potential to run into OOM. I have > 1 million entries in the same
> level and it took lot longer time with {{RemoteIterator}} (didn't complete as
> it was stuck in RDB::seek).
> S3A batches it with 5K listing per fetch IIRC. It would be good to have this
> feature in ozone as well.
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