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https://issues.apache.org/jira/browse/HDFS-11156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724552#comment-15724552
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Andrew Wang commented on HDFS-11156:
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Hi [~cheersyang] I think you misunderstand: the new version of
WebHdfsFileSystem#getFileBlockLocations always calls GETFILEBLOCKLOCATIONS,
there is no fallback mechanism to call GET_BLOCK_LOCATIONS. I'm basically
proposing we add a fallback to the old code.
Looking at HDFS-10756, it implements a fallback to the default implementation
if the call fails:
{code}
1638 } catch(IOException e) {
1639 LOG.warn("Cannot find trash root of " + path, e);
1640 // keep the same behavior with dfs
1641 return super.getTrashRoot(path).makeQualified(getUri(), null);
1642 }
{code}
> Add new op GETFILEBLOCKLOCATIONS to WebHDFS REST API
> ----------------------------------------------------
>
> Key: HDFS-11156
> URL: https://issues.apache.org/jira/browse/HDFS-11156
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: webhdfs
> Affects Versions: 2.7.3
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
> Fix For: 2.8.0, 3.0.0-alpha2
>
> Attachments: HDFS-11156.01.patch, HDFS-11156.02.patch,
> HDFS-11156.03.patch, HDFS-11156.04.patch, HDFS-11156.05.patch,
> HDFS-11156.06.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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