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https://issues.apache.org/jira/browse/HBASE-16296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400164#comment-15400164
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Ted Yu commented on HBASE-16296:
--------------------------------
I wonder if the following change would help :
{code}
diff --git
a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
index 89e723e..fa3836f 100644
---
a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
+++
b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
@@ -5951,6 +5951,10 @@ public class HRegion implements HeapSize,
PropagatingConfigurationObserver, Regi
// Technically, if we hit limits before on this row, we don't need
this call.
if (filterRowKey(current)) {
incrementCountOfRowsFilteredMetric(scannerContext);
+ if (isFilterDoneInternal()) {
+ return
scannerContext.setScannerState(NextState.NO_MORE_VALUES).hasMoreValues();
+ }
+
// Typically the count of rows scanned is incremented inside
#populateResult. However,
// here we are filtering a row based purely on its row key,
preventing us from calling
// #populateResult. Thus, perform the necessary increment here to
rows scanned metric
{code}
> Reverse scan performance degrades when scanner cache size matches page filter
> size
> ----------------------------------------------------------------------------------
>
> Key: HBASE-16296
> URL: https://issues.apache.org/jira/browse/HBASE-16296
> Project: HBase
> Issue Type: Bug
> Reporter: James Taylor
> Attachments: 16296-MAYBE.txt, generatedata-snippet.java,
> repro-snippet.java
>
>
> When a reverse scan is done, the server seems to not know it's done when the
> scanner cache size matches the number of rows in a PageFilter. See
> PHOENIX-3121 for how this manifests itself. We have a standalone, pure HBase
> API reproducer too that I'll attach (courtesy of [~churromorales] and
> [~mujtabachohan]).
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