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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11569) Ozone: Implement listKey function for KeyManager
Date Fri, 24 Mar 2017 02:00:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939563#comment-15939563
] 

Anu Engineer commented on HDFS-11569:
-------------------------------------

I am worried that we will need to support pagination. Here is the back of envelop calculation.
If we assume users are putting 4 KB sized objects into ozone and our containers are 5GB in
size, then we can have 5GB/4KB objects in a container, which is 
1,250,000. That surely cannot be returned via single RPC call.

Now I do see that you have a filter called "prefix", but then again user may not know how
many keys with that prefix exists and may not be able to deal with the list without pagination.


> Ozone: Implement listKey function for KeyManager
> ------------------------------------------------
>
>                 Key: HDFS-11569
>                 URL: https://issues.apache.org/jira/browse/HDFS-11569
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>
> List keys by prefix from a container. This doesn't need to support pagination as keys
in a single container should be containable.



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