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