You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-issues@hadoop.apache.org by "Gabor Bota (JIRA)" <ji...@apache.org> on 2019/05/06 09:11:00 UTC
[jira] [Assigned] (HADOOP-16279) S3Guard: Implement time-based
(TTL) expiry for entries (and tombstones)
[ https://issues.apache.org/jira/browse/HADOOP-16279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gabor Bota reassigned HADOOP-16279:
-----------------------------------
Assignee: Gabor Bota
> 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
> Assignee: 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 TTL feature|https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html]. We need a different behaviour 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-issues-help@hadoop.apache.org