hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6427) Pluggable compaction policies via coprocessors
Date Sat, 28 Jul 2012 05:26:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424270#comment-13424270
] 

Zhihong Ted Yu commented on HBASE-6427:
---------------------------------------

Some new files need license header.
{code}
+public class ScanPolicyCoprocessor extends BaseRegionObserver {
{code}
This class is an observer. Suggest renaming the class.
Annotations for audience and stability should be added.

For RegionCoprocessorHost.preCompact():
{code}
+          scanner = ((RegionObserver) env.getInstance()).preCompact(ctx, store, scanners,
+              scanType, earliestPutTs);
{code}
If there're multiple RegionObserver's, it seems only the final returned scanner would be returned.
Is this intentional ?
Similar observation for preStoreScannerOpen() and preFlush()
                
> Pluggable compaction policies via coprocessors
> ----------------------------------------------
>
>                 Key: HBASE-6427
>                 URL: https://issues.apache.org/jira/browse/HBASE-6427
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>         Attachments: 6427-notReady.txt, 6427-v1.txt, 6427-v2.txt, 6427-v3.txt, 6427-v4.txt,
6427-v5.txt
>
>
> When implementing higher level stores on top of HBase it is necessary to allow dynamic
control over how long KVs must be kept around.
> Semi-static config options for ColumnFamilies (# of version or TTL) is not sufficient.
> This can be done with a few additional coprocessor hooks, or by makeing Store.ScanInfo
pluggable.
> Was:
> The simplest way to achieve this is to have a pluggable class to determine the smallestReadpoint
for Region. That way outside code can control what KVs to retain.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message