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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16296) Reverse scan performance degrades when scanner cache size matches page filter size
Date Sat, 30 Jul 2016 12:00:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15400649#comment-15400649
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Ted Yu commented on HBASE-16296:
--------------------------------

w.r.t. Lars' patch, isn't the following change of behavior ?
{code}
-    assertTrue(filterMPONE.filterRowKey(rowkey, 0, rowkey.length));
+    assertTrue(filterMPONE.filterAllRemaining());
+    assertFalse(filterMPONE.filterRowKey(rowkey, 0, rowkey.length));
{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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