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Posted to hdfs-issues@hadoop.apache.org by "Manoj Govindassamy (JIRA)" <ji...@apache.org> on 2017/06/09 01:54:18 UTC
[jira] [Updated] (HDFS-10480) Add an admin command to list
currently open files
[ https://issues.apache.org/jira/browse/HDFS-10480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Manoj Govindassamy updated HDFS-10480:
--------------------------------------
Attachment: HDFS-10480.07.patch
Thanks for the review comments [~andrew.wang]. Attached v07 patch to address the following. Please take a look.
bq. DFSAdmin, I'd prefer that we don't print a special message when there aren't any open files. Just print the header with no entries.
Done.
bq. DFSAdmin help text needs an additional linebreak and tab to wrap the long line in the output
Done.
Bq. Thinking about it a little more, we can remove the HdfsAdmin API and make the CLI the only public API. A number of DFSAdmin commands don't have corresponding HdfsAdmin APIs (e.g. evictWriters, triggerBlockReport). We can always add the Java API later if there's demand.
Given that this jira is very useful for debugging problems, I am anticipating HdfsAdmin API demand from automation users who are already using the interface. Unit tests are also added to verify the API. Inclined to retain it for it now. There are also followup enhancements planned on top of this jira, and if any need to be removed can be taken care later. Thanks.
> Add an admin command to list currently open files
> -------------------------------------------------
>
> Key: HDFS-10480
> URL: https://issues.apache.org/jira/browse/HDFS-10480
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Kihwal Lee
> Assignee: Manoj Govindassamy
> Attachments: HDFS-10480.02.patch, HDFS-10480.03.patch, HDFS-10480.04.patch, HDFS-10480.05.patch, HDFS-10480.06.patch, HDFS-10480.07.patch, HDFS-10480-trunk-1.patch, HDFS-10480-trunk.patch
>
>
> Currently there is no easy way to obtain the list of active leases or files being written. It will be nice if we have an admin command to list open files and their lease holders.
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