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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11156) Webhdfs rest api GET_BLOCK_LOCATIONS output doesn't comply with FileSystem API
Date Wed, 23 Nov 2016 02:36:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15688666#comment-15688666
] 

Weiwei Yang commented on HDFS-11156:
------------------------------------

Hello Mingliang Liu
Would you help to review this patch ? 
I have built latest trunk and tested with this patch, use

{code}
http://<HOST>:<PORT>/webhdfs/v1/tmp/test1.img?op=GET_BLOCK_LOCATIONS&offset=0&length=1&user.name=yangww
{code}

it returns output

{code}
{"BlockLocations":[{"cachedHosts":[],"corrupt":false,"hosts":["deale1.fyre.ibm.com"],"length":134217728,"names":["9.30.167.122:9866"],"offset":0,"storageIds":["DS-2c136bcd-d658-4853-8b7d-9ecb354e6093"],"storageTypes":["DISK"],"topologyPaths":["/default-rack/9.30.167.122:9866"]}]}
{code}

client would easily parse this to BlockLocation array using json parser or object mapper,
just like the test case code I added to {{TestWebHDFS}}.

> Webhdfs rest api GET_BLOCK_LOCATIONS output doesn't comply with FileSystem API
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-11156
>                 URL: https://issues.apache.org/jira/browse/HDFS-11156
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 2.7.3
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>         Attachments: HDFS-11156.01.patch, HDFS-11156.02.patch, HDFS-11156.03.patch
>
>
> Following webhdfs REST API
> {code}
> http://<HOST>:<PORT>/webhdfs/v1/<PATH>?op=GET_BLOCK_LOCATIONS&offset=0&length=1
> {code}
> will get a response like
> {code}
> {
>   "LocatedBlocks" : {
>     "fileLength" : 1073741824,
>     "isLastBlockComplete" : true,
>     "isUnderConstruction" : false,
>     "lastLocatedBlock" : { ... },
>     "locatedBlocks" : [ {...} ]
>   }
> }
> {code}
> This represents for *o.a.h.h.p.LocatedBlocks*. However according to *FileSystem* API,

> {code}
> public BlockLocation[] getFileBlockLocations(Path p, long start, long len)
> {code}
> clients would expect an array of BlockLocation. This mismatch should be fixed. Marked
as Incompatible change as this will change the output of the GET_BLOCK_LOCATIONS API.



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