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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5010) Filter HFiles based on TTL
Date Mon, 26 Dec 2011 23:00:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176043#comment-13176043
] 

Phabricator commented on HBASE-5010:
------------------------------------

mbautin has abandoned the revision "[jira] [HBASE-5010] Filter HFiles based on TTL".

  This was committed into trunk by @tedyu, closing the revision.

  @tedyu: could you please include a line of the form "Differential Revision: D1017" in commit
messages in the future? That way the revision could be automatically marked as "committed"
in Phabricator.

REVISION DETAIL
  https://reviews.facebook.net/D1017

                
> Filter HFiles based on TTL
> --------------------------
>
>                 Key: HBASE-5010
>                 URL: https://issues.apache.org/jira/browse/HBASE-5010
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Mikhail Bautin
>            Assignee: Zhihong Yu
>         Attachments: 5010.patch, D1017.1.patch, D1017.2.patch, D909.1.patch, D909.2.patch,
D909.3.patch
>
>
> In ScanWildcardColumnTracker we have
> {code:java}
>  
>   this.oldestStamp = EnvironmentEdgeManager.currentTimeMillis() - ttl;
>   ...
>   private boolean isExpired(long timestamp) {
>     return timestamp < oldestStamp;
>   }
> {code}
> but this time range filtering does not participate in HFile selection. In one real case
this caused next() calls to time out because all KVs in a table got expired, but next() had
to iterate over the whole table to find that out. We should be able to filter out those HFiles
right away. I think a reasonable approach is to add a "default timerange filter" to every
scan for a CF with a finite TTL and utilize existing filtering in StoreFile.Reader.passesTimerangeFilter.

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