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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-18665) ReversedScannerCallable invokes getRegionLocations incorrectly
Date Tue, 29 Aug 2017 15:04:01 GMT

     [ https://issues.apache.org/jira/browse/HBASE-18665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Busbey updated HBASE-18665:
--------------------------------
    Priority: Critical  (was: Major)

> ReversedScannerCallable invokes getRegionLocations incorrectly
> --------------------------------------------------------------
>
>                 Key: HBASE-18665
>                 URL: https://issues.apache.org/jira/browse/HBASE-18665
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 3.0.0, 1.4.0, 1.3.2, 1.5.0, 1.2.7, 1.1.13
>            Reporter: Peter Somogyi
>            Assignee: Peter Somogyi
>            Priority: Critical
>             Fix For: 3.0.0, 1.4.0, 1.5.0, 2.0.0-alpha-3
>
>         Attachments: 18665.master.003.patch, HBASE-18665.branch-1.003.patch, HBASE-18665.branch-1.003.patch,
HBASE-18665.master.001.patch, HBASE-18665.master.002.patch, HBASE-18665.master.003.patch,
HBASE-18665.master.003.patch
>
>
> The behavior of ReversedScannerCallable#prepare [1] and ScannerCallable#prepare [2] methods
differ how they call RpcRetryingCallerWithReadReplicas.getRegionLocations method.
> The reversed scanner uses the 'reload' parameter directly as the first argument - RpcRetryingCallerWithReadReplicas.getRegionLocations(reload,
id, getConnection(), getTableName(), getRow()) - however, the forward scanner passes '!reload'.
The getRegionLocations first parameter is 'useCache', the way we use it in ScannerCallable
is the correct one.
> The same call can be found in ReversedScannerCallable#locateRegionsInRange [3] also without
negating its value.
> [1] https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ReversedScannerCallable.java#L89-L90
> [2] https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ScannerCallable.java#L139-L140
> [3] https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ReversedScannerCallable.java#L143-L144



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