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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3667) Add retry support to WebHdfsFileSystem
Date Thu, 02 Aug 2012 02:02:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427073#comment-13427073
] 

Tsz Wo (Nicholas), SZE commented on HDFS-3667:
----------------------------------------------

> HftpFileSystem.java no change in branch-1?

Yes.  It is because HftpFileSystem does not use ByteRangeInputStream in branch-1, i.e. it
does not support seek.

> Runner#shouldRetry() has different code. Is it due to difference between branch-1 and
trunk?

Yes.  In trunk, the RPC retry policy was changed by the HA work.

> {{ conn.setRequestProperty("Content-Type", "application/octet-stream");}} is not set
in branch-1 patch?

No, we have the following
{code}
//WebHdfsFileSystem.Runner.twoStepWrite()
      conn.setRequestProperty("Content-Type", MediaType.APPLICATION_OCTET_STREAM);
{code}

                
> Add retry support to WebHdfsFileSystem
> --------------------------------------
>
>                 Key: HDFS-3667
>                 URL: https://issues.apache.org/jira/browse/HDFS-3667
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: webhdfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 2.0.1-alpha
>
>         Attachments: h3667_20120718.patch, h3667_20120721.patch, h3667_20120722.patch,
h3667_20120725.patch, h3667_20120730.patch, h3667_20120730_b-1.patch
>
>
> DFSClient (i.e. DistributedFileSystem) has a configurable retry policy and it retries
on exceptions such as connection failure, safemode.  WebHdfsFileSystem should have similar
retry support.

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