[jira] [Commented] (HADOOP-15834) Improve throttling on S3Guard DDB batch retries

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-15834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16874419#comment-16874419 ] 

Steve Loughran commented on HADOOP-15834:
-----------------------------------------

With DDB on demand, throttling effectively goes away. So this is less important

> Improve throttling on S3Guard DDB batch retries
> -----------------------------------------------
>
>                 Key: HADOOP-15834
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15834
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.2.0
>            Reporter: Steve Loughran
>            Priority: Major
>
> the batch throttling may fail too fast 
> if there's batch update of 25 writes but the default retry count is nine attempts, only nine writes of the batch may be attempted...even if each attempt is actually successfully writing data.
> In contrast, a single write of a piece of data gets the same no. of attempts, so 25 individual writes can handle a lot more throttling than a bulk write.
> Proposed: retry logic to be more forgiving of batch writes, such as not consider a batch call where at least one data item was written to count as a failure



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