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https://issues.apache.org/jira/browse/HBASE-16296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398123#comment-15398123
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Mujtaba Chohan commented on HBASE-16296:
----------------------------------------
[~larsh] please check with the following code. See a small difference of
passing FilterList instead of Filter to scan. This is with both 0.98.20 and
0.98.17.
{code}
Scan scan = new Scan();
scan.setReversed(true);
byte[] stop = new byte[]{48, 48, 68, 120, 48, 48, 48, 48, 48, 48, 48, 71, 121,
89, 83, 48, 56, 109};
byte[] start = new byte[]{48, 48, 68, 120, 48, 48, 48, 48, 48, 48, 48, 71, 121,
89, 83, 48, 56, 110};
scan.setStartRow(start);
scan.setStopRow(stop);
FilterList filters = new FilterList();
PageFilter pagefilter = new PageFilter(5);
filters.addFilter(pagefilter);
scan.setFilter(filters);
Configuration conf = new Configuration();
conf.set("hbase.zookeeper.quorum", "localhost");
conf.set("hbase.client.scanner.caching", "5");
HConnectionManager.createConnection(conf);
HTable table = new HTable(conf,
TableName.valueOf("PLATFORM_ENTITY.PLATFORM_IMMUTABLE_ENTITY_DATA"));
ResultScanner resultScanner = table.getScanner(scan);
Result result = null;
while ((result = resultScanner.next()) != null) {
System.out.println(result);
}
System.out.println("All Done");
table.close();
{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: 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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