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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13761) S3Guard: implement retries for DDB failures and throttling
Date Tue, 12 Sep 2017 13:00:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162889#comment-16162889
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Steve Loughran commented on HADOOP-13761:
-----------------------------------------

Note that the DDB throttled EX is 400; you can't use RESTy error code logic here,

Also, in {{waitForTableActive()}} failures are remapped to Illegal Argument Exceptions.


> S3Guard: implement retries for DDB failures and throttling
> ----------------------------------------------------------
>
>                 Key: HADOOP-13761
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13761
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.0.0-beta1
>            Reporter: Aaron Fabbri
>            Assignee: Steve Loughran
>
> Following the S3AFileSystem integration patch in HADOOP-13651, we need to add retry logic.
> In HADOOP-13651, I added TODO comments in most of the places retry loops are needed,
including:
> - open(path).  If MetadataStore reflects recent create/move of file path, but we fail
to read it from S3, retry.
> - delete(path).  If deleteObject() on S3 fails, but MetadataStore shows the file exists,
retry.
> - rename(src,dest).  If source path is not visible in S3 yet, retry.
> - listFiles(). Skip for now. Not currently implemented in S3Guard. I will create a separate
JIRA for this as it will likely require interface changes (i.e. prefix or subtree scan).
> We may miss some cases initially and we should do failure injection testing to make sure
we're covered.  Failure injection tests can be a separate JIRA to make this easier to review.
> We also need basic configuration parameters around retry policy.  There should be a way
to specify maximum retry duration, as some applications would prefer to receive an error eventually,
than waiting indefinitely.  We should also be keeping statistics when inconsistency is detected
and we enter a retry loop.



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