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https://issues.apache.org/jira/browse/HDFS-13512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16462975#comment-16462975
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Rushabh S Shah commented on HDFS-13512:
---------------------------------------
I was reviewing the latest patch #v5.
+JsonUtil.java+
{noformat}
+ // to maintain backward comparability
m.put("ecPolicy", status.getErasureCodingPolicy().getName());
+ // to re-construct HdfsFileStatus object via WebHdfs
+ m.put("ecPolicyObj",
getEcPolicyAsMap(status.getErasureCodingPolicy()));
{noformat}
I am wondering why we want to preserve {{ecPolicy}} in json payload that server
sends.
On the client side, {{WebhdfsFileSystem}} is not even reading {{ecPolicy}} from
json.
Also we don't return ec related bits in {{GETFILESTATUS}} via curl also. Refer
[GETFILESTATUS|https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/WebHDFS.html#Status_of_a_File.2FDirectory]
So it is ok to remove {{ecPolicy}} from {{JsonUtil}} and don't worry about
backwards compatibility.
While going through history of adding erasure coding policy in
{{DistributedFileSystem}}, I came across this jira [HDFS-11565].
We should adopt the same logic in {{WebhdfsFileSystem}} also.
Hope it helps.
> WebHdfs getFileStatus doesn't return ecPolicy
> ---------------------------------------------
>
> Key: HDFS-13512
> URL: https://issues.apache.org/jira/browse/HDFS-13512
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ajay Kumar
> Assignee: Ajay Kumar
> Priority: Major
> Attachments: HDFS-13512.00.patch, HDFS-13512.01.patch,
> HDFS-13512.02.patch, HDFS-13512.03.patch, HDFS-13512.04.patch,
> HDFS-13512.05.patch
>
>
> Currently LISTSTATUS call to WebHdfs returns a json. These jsonArray elements
> do have the ecPolicy name.
> But when WebHdfsFileSystem converts it back into a FileStatus object, the
> ecPolicy is not added. This is because the json contains only the ecPolicy
> name and this name is not sufficient to decode it back to ErasureCodingPolicy
> object.
> While converting json back to HdfsFileStatus we should set ecPolicyName
> whenever it is set for give file/dir.
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