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From "Takanobu Asanuma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14593) RBF: Implement deletion feature for expired records in State Store
Date Wed, 10 Jul 2019 19:39:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882384#comment-16882384

Takanobu Asanuma commented on HDFS-14593:

Thanks, [~elgoiri].

bq. My only concern now is the fact that we are going to the backend (say ZooKeeper) twice,

Yes, you are right. It's definitely a problem.

Uploaded 007.patch. It refers the backend once, and it removes expired records from both the
cache and the backend in {{overrideExpiredRecord()}}.

To modify records in the cache, it includes two additional changes.
* use ArrayList instead of Collections.singletonList in {{CachedRecordStore#overrideExpiredRecord(R
* not use Collections.unmodifiableList in {{QueryResult#getRecords()}}

I'm not sure whether the changes of 007.patch can be acceptable. If not, it may be better
just not to change the order in {{CachedRecordStore#loadCache()}}. We may be able to compromise
the behavior that I mentioned before.

bq. If not changing the order, expired records keep existing in the cache(result at CachedRecordStore#118)
after deleting them from State Store by overrideExpiredRecords(). Then, they are deleted from
the cache in the next loadCache.

> RBF: Implement deletion feature for expired records in State Store
> ------------------------------------------------------------------
>                 Key: HDFS-14593
>                 URL: https://issues.apache.org/jira/browse/HDFS-14593
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: rbf
>            Reporter: Takanobu Asanuma
>            Assignee: Takanobu Asanuma
>            Priority: Major
>         Attachments: HDFS-14593.001.patch, HDFS-14593.002.patch, HDFS-14593.003.patch,
HDFS-14593.004.patch, HDFS-14593.005.patch, HDFS-14593.006.patch, HDFS-14593.007.patch
> Currently, any router seems to exist in the Router Information eternally.

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