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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15378) Scanner cannot handle heartbeat message with no results
Date Wed, 09 Mar 2016 23:30:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15188297#comment-15188297
] 

Hudson commented on HBASE-15378:
--------------------------------

SUCCESS: Integrated in HBase-1.3 #595 (See [https://builds.apache.org/job/HBase-1.3/595/])
HBASE-15378 Scanner cannot handle heartbeat message with no results (tedyu: rev d686fec14495ac5eff3d661cc6a842d1f401c8d2)
* hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClientScanner.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestScannerHeartbeatMessages.java


> Scanner cannot handle 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
>             Fix For: 2.0.0, 1.3.0, 1.2.1, 1.4.0
>
>         Attachments: HBASE-15378-v1.txt, HBASE-15378-v2.txt, HBASE-15378-v3.txt, HBASE-15378-v4.patch,
HBASE-15378-v5.patch, HBASE-15378-v6.patch
>
>
> 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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