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From "Gabor Bota (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16279) S3Guard: Implement time-based (TTL) expiry for entries (and tombstones)
Date Tue, 30 Apr 2019 12:24:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16830237#comment-16830237
] 

Gabor Bota commented on HADOOP-16279:
-------------------------------------

cc [~fabbri]; [~mackrorysd]; [~stevel@apache.org];

> S3Guard: Implement time-based (TTL) expiry for entries (and tombstones)
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-16279
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16279
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Gabor Bota
>            Priority: Major
>
> In HADOOP-15621 we implemented TTL for Authoritative Directory Listings and added {{ExpirableMetadata}}.
{{DDBPathMetadata}} extends {{PathMetadata}} extends {{ExpirableMetadata}}, so all metadata
entries in ddb can expire, but the implementation is not done yet. 
> To complete this feature the following should be done:
> * Add new tests for metadata entry and tombstone expiry to {{ITestS3GuardTtl}}
> * Implement metadata entry and tombstone expiry 
> I would like to start a debate on whether we need to use separate expiry times for entries
and tombstones. My +1 on not using separate settings - so only one config name and value.
> ----
> Notes:
> * In HADOOP-13649 the metadata TTL is implemented in LocalMetadataStore, using an existing
feature in guava's cache implementation. Expiry is set with {{fs.s3a.s3guard.local.ttl}}.
> * This is not the same, and not using the DDB's feature of ttl [(DOCS)|https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html].
We need stronger consistency guarantees than what ddb promises: [cleaning once a day with
a background job|https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/howitworks-ttl.html]
is not usable for this feature - although it can be used as a general cleanup solution separately
and independently from S3Guard.



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