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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5010) Filter HFiles based on TTL
Date Thu, 29 Dec 2011 03:22:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176966#comment-13176966
] 

Hadoop QA commented on HBASE-5010:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12508817/D909.5.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 20 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/620//console

This message is automatically generated.
                
> 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, D909.4.patch, D909.5.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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