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From "Gabor Bota (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-16279) S3Guard: Implement time-based (TTL) expiry for entries (and tombstones)
Date Tue, 30 Apr 2019 12:22:00 GMT
Gabor Bota created HADOOP-16279:
-----------------------------------

             Summary: 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


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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