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https://issues.apache.org/jira/browse/HDFS-9724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15129652#comment-15129652
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Akira AJISAKA commented on HDFS-9724:
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Thanks [~cnauroth] for the detailed comment.
bq. AFAIK, we don't have a re-entrant call pattern in WebHDFS though, and we
just need to worry about thread-safety.
Agree.
bq. In addition to the changes in the current patch, I also see one more new
ObjectMapper() call inside WebHdfsFileSystem.
Nice catch! I'll fix it shortly.
bq. We probably need a comprehensive review across the whole codebase to look
for this pattern, but we can keep the current JIRA's scope focused on WebHDFS,
since we know it is causing a performance problem there.
Agree. I'd like to keep the current scope.
> WebHDFS listing is too slow after HDFS-6565
> -------------------------------------------
>
> Key: HDFS-9724
> URL: https://issues.apache.org/jira/browse/HDFS-9724
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: performance
> Affects Versions: 2.7.0
> Reporter: Akira AJISAKA
> Assignee: Akira AJISAKA
> Priority: Critical
> Attachments: HDFS-9724-branch-2.7.01.patch, HDFS-9724.01.patch
>
>
> Eremikhin Alexey reported at user ML that WebHDFS listing is too slow because
> of HDFS-6565.
> https://mail-archives.apache.org/mod_mbox/hadoop-hdfs-user/201601.mbox/%3C56AB857B.6020105%40corp.badoo.com%3E
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