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https://issues.apache.org/jira/browse/HBASE-5664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13540351#comment-13540351
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Anoop Sam John commented on HBASE-5664:
---------------------------------------
Yes in core we do not do any seek to the next row(as in HBASE-6577)
This is just a hook so that an implementation like sec index can make use of
this.
// 2. provide a hook to fast forward the row (used by subclasses)
nextRow(currentRow);
The above comment in the code says calling nextRow() can potentially give a way
for fast forwarding. But not sure how to make use. The RegionScannerImpl is not
a public class and so can not be subclassed. We can only wrap this obj. So I
felt new hook is the only way.
[[email protected]] You have some comments/suggestion ?
> CP hooks in Scan flow for fast forward when filter filters out a row
> --------------------------------------------------------------------
>
> Key: HBASE-5664
> URL: https://issues.apache.org/jira/browse/HBASE-5664
> Project: HBase
> Issue Type: Improvement
> Components: Coprocessors
> Affects Versions: 0.92.1
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 0.96.0
>
>
> In HRegion.nextInternal(int limit, String metric)
> We have while(true) loop so as to fetch a next result which satisfies
> filter condition. When Filter filters out the current fetched row we call
> nextRow(byte [] currentRow) before going with the next row.
> {code}
> if (results.isEmpty() || filterRow()) {
> // this seems like a redundant step - we already consumed the row
> // there're no left overs.
> // the reasons for calling this method are:
> // 1. reset the filters.
> // 2. provide a hook to fast forward the row (used by subclasses)
> nextRow(currentRow);
> {code}
> // 2. provide a hook to fast forward the row (used by subclasses)
> We can provide same feature of fast forward support for the CP also.
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