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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4296) Dead loop in HBase reverse scan when amount of scan data is greater than SCAN_RESULT_CHUNK_SIZE
Date Fri, 17 May 2019 21:49:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842630#comment-16842630
] 

Hudson commented on PHOENIX-4296:
---------------------------------

FAILURE: Integrated in Jenkins build PreCommit-PHOENIX-Build #2587 (See [https://builds.apache.org/job/PreCommit-PHOENIX-Build/2587/])
PHOENIX-4296: reverse scan in ChunkedResultIterator (tdsilva: rev accd0af195b521cd572219d93033f94ad3b3401e)
* (add) phoenix-core/src/test/java/org/apache/phoenix/iterate/ChunkedResultIteratorTest.java
* (edit) phoenix-core/src/main/java/org/apache/phoenix/iterate/ChunkedResultIterator.java


> Dead loop in HBase reverse scan when amount of scan data is greater than SCAN_RESULT_CHUNK_SIZE
> -----------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-4296
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4296
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.6.0
>            Reporter: rukawakang
>            Assignee: Chen Feng
>            Priority: Major
>             Fix For: 4.15.0, 5.1.0, 4.14.2
>
>         Attachments: PHOENIX-4296-4.x-HBase-1.2-v2.patch, PHOENIX-4296-4.x-HBase-1.2-v3.patch,
PHOENIX-4296-4.x-HBase-1.2-v4.patch, PHOENIX-4296-4.x-HBase-1.2.patch, PHOENIX-4296.patch
>
>
> This problem seems to only occur with reverse scan not forward scan. When amount of scan
data is greater than SCAN_RESULT_CHUNK_SIZE(default 2999), Class ChunkedResultIteratorFactory
will multiple calls function getResultIterator. But in function getResultIterator it always
readjusts startRow, in fact, if in reverse scan we should readjust stopRow. For example 
> {code:java}
> if (ScanUtil.isReversed(scan)) {
>     scan.setStopRow(ByteUtil.copyKeyBytesIfNecessary(lastKey));
> } else {
>     scan.setStartRow(ByteUtil.copyKeyBytesIfNecessary(lastKey));
> }
> {code}



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