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Date: Thu, 25 May 2017 16:31:04 +0000 (UTC)
From: "Weiwei Yang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13070275.1494307267000.295254.1495729864447@Atlassian.JIRA>
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References: <JIRA.13070275.1494307267000@Atlassian.JIRA> <JIRA.13070275.1494307267825@jira-lw-us.apache.org>
Subject: [jira] [Commented] (HDFS-11779) Ozone: KSM: add listBuckets
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archived-at: Thu, 25 May 2017 16:31:10 -0000


    [ https://issues.apache.org/jira/browse/HDFS-11779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024972#comment-16024972 ] 

Weiwei Yang commented on HDFS-11779:
------------------------------------

V1 patch attached, please kindly review. Some notes for reviewers

1. Please read {{TestKeySpaceManager#testListBuckets}} to see how {{listBuckets}} api is used. The volume name is required, rest of arguments are optional. I tried to include as many as combinations when specifying arguments.

2. To be able to query buckets under constrain of {{ListArgs}} arguments, I have created a helper method in {{LevelDBStore}}, which is

{code}
  public List<Entry<byte[], byte[]>> getRangeKVs(@Nullable byte[] startKey,
      int count, LevelDBKeyFilter... filters) throws IOException
{code}

this helps to get a range of entries from DB based on the conditions. It should be able to be reused in other api implementation such as listVolumes, or any other one involves to search a range of keys. I have created a test class to test this api, see {{TestLevelDBStore#testGetRangeKVs}}.

Hope this helps. Thanks.

> Ozone: KSM: add listBuckets
> ---------------------------
>
>                 Key: HDFS-11779
>                 URL: https://issues.apache.org/jira/browse/HDFS-11779
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Anu Engineer
>            Assignee: Weiwei Yang
>         Attachments: HDFS-11779-HDFS-7240.001.patch
>
>
> Lists buckets of a given volume. Similar to listVolumes, paging supported via prevKey, prefix and maxKeys.


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