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From "Thomas Demoor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12292) Make use of DeleteObjects optional
Date Mon, 03 Aug 2015 06:47:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651506#comment-14651506
] 

Thomas Demoor commented on HADOOP-12292:
----------------------------------------

Oh, now I get what you ([~stevel@apache.org] and [~ndimiduk]) meant by TTL: Object expiration
through bucket lifecylces.

Not sure that approach is easy, there are several non-trivial issues. Some that immediately
come to mind:
* You are limited to 1000 policy rules per bucket
* Prefix based
{{PUT Object: mybucket/object}} -> write a file
{{PUT Bucket lifecycle: mybucket, Expiration, 1 day, prefix=object}} -> asynchronously
delete this file
{{PUT Object: mybucket/object2}} -> write another file
The next day BOTH files are automatically deleted (prefix!!!)
Also, all future writes which share the prefix will also be deleted automatically after a
day.



> Make use of DeleteObjects optional
> ----------------------------------
>
>                 Key: HADOOP-12292
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12292
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Thomas Demoor
>            Assignee: Thomas Demoor
>
> The {{DeleteObjectsRequest}} was not part of the initial S3 API, but was added later.
This patch allows one to configure s3a to replace each multidelete request by consecutive
single deletes. Evidently, this setting is disabled by default as this causes slower deletes.
> The main motivation is to enable legacy S3-compatible object stores to make the transition
from s3n (which does not use multidelete) to s3a, fully allowing the planned s3n deprecation.



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