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From "Thomas D'Silva (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (PHOENIX-4296) Dead loop in HBase reverse scan when amount of scan data is greater than SCAN_RESULT_CHUNK_SIZE
Date Wed, 15 May 2019 17:19:00 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-4296?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas D'Silva reassigned PHOENIX-4296:
---------------------------------------

    Assignee: Chen Feng

> 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: 4.14.2
>
>         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.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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