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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15378) Scanner can not handle a heartbeat message with no results
Date Tue, 08 Mar 2016 17:02:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185246#comment-15185246
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Anoop Sam John commented on HBASE-15378:
----------------------------------------

{code}
while (scanner.next() != null) {
317	          num++;
318	        }
319	        assertEquals(1, num);
{code}
It is full scan and so need to get back 'NUM_ROWS' Results back right? Why expectation s 1
Result?

> Scanner can not handle a heartbeat message with no results
> ----------------------------------------------------------
>
>                 Key: HBASE-15378
>                 URL: https://issues.apache.org/jira/browse/HBASE-15378
>             Project: HBase
>          Issue Type: Bug
>          Components: dataloss, Scanners
>    Affects Versions: 1.2.0, 1.1.3
>            Reporter: Phil Yang
>            Assignee: Phil Yang
>            Priority: Critical
>         Attachments: HBASE-15378-v1.txt, HBASE-15378-v2.txt, HBASE-15378-v3.txt
>
>
> When a RS scanner get a TIME_LIMIT_REACHED_MID_ROW state, they will stop scanning and
send back what it has read to client and mark the message as a heartbeat message. If there
is no cell has been read, it will be an empty response. 
> However, ClientScanner only handles the situation that the client gets an empty heartbeat
and its cache is not empty. If the cache is empty too, it will be regarded as end-of-region
and open a new scanner for next region.



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