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https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424622#comment-13424622
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Zhihong Ted Yu commented on HBASE-6427:
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Review board doesn't show correct formatting. So I put the following here.
bq. to make a new Interface extending both InternalScanner and KeyValueScanner
I like the above approach.
Currently we have:
{code}
$ find src/main -name '*.java' -exec grep 'ments.*InternalScanner' {} \; -print
* also implements InternalScanner. WARNING: As is, if you try to use this
implements KeyValueScanner, InternalScanner {
src/main/java/org/apache/hadoop/hbase/regionserver/KeyValueHeap.java
implements KeyValueScanner, InternalScanner, ChangedReadersObserver {
src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
{code}
Combining InternalScanner and KeyValueScanner seems natural.
> 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, 6427-v7.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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