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https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423305#comment-13423305
]
Andrew Purtell commented on HBASE-6427:
---------------------------------------
Or use polymorphism?
{noformat}
+ public InternalScanner preFlush(final
ObserverContext<RegionCoprocessorEnvironment> c,
+ Store store, KeyValueScanner scanner) throws IOException;
+
+ @Deprecated
public void preFlush(ObserverContext<RegionCoprocessorEnvironment> e) throws
IOException;
{noformat}
{noformat}
+ public InternalScanner preCompact(final
ObserverContext<RegionCoprocessorEnvironment> c,
+ Store store, List<? extends KeyValueScanner> scanners, ScanType
scanType, long earliestPutTs)
+ throws IOException;
+
+ @Deprecated
public void preCompact(ObserverContext<RegionCoprocessorEnvironment> e
...
{noformat}
> 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
> Priority: Minor
> Attachments: 6427-notReady.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.
> 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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