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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-997) Implement S3 retry mechanism for failed block transfers
Date Sun, 18 Feb 2007 22:00:12 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated HADOOP-997:
-----------------------------

    Attachment: HADOOP-997-v2.patch

Version 2 patch that addresses all the issues listed above, except for clearing out the temp
directory on startup.

The exception while using "hadoop fs" was because the visibility of FileSystemStore was package
private, which caused problems when creating proxies that are used from other packages. (I
hadn't tested properly since I hadn't enabled retries for S3 when I did my testing!)

I'm now encountering a different problem when trying to copy local files to S3. I get the
error

put: No such file or directory

I'm still investigating the cause of this to see if it is related. 

> Implement S3 retry mechanism for failed block transfers
> -------------------------------------------------------
>
>                 Key: HADOOP-997
>                 URL: https://issues.apache.org/jira/browse/HADOOP-997
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.11.0
>            Reporter: Tom White
>         Assigned To: Tom White
>         Attachments: HADOOP-997-v2.patch, HADOOP-997.patch
>
>
> HADOOP-882 improves S3FileSystem so that when certain communications problems with S3
occur the operation is retried. However, the retry mechanism cannot handle a block transfer
failure, since blocks may be very large and we don't want to buffer them in memory. This improvement
is to write a wrapper (using java.lang.reflect.Proxy if possible - see discussion in HADOOP-882)
that can retry block transfers.

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