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https://issues.apache.org/jira/browse/HBASE-18665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16138420#comment-16138420
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Mike Drob commented on HBASE-18665:
-----------------------------------
Good find, [~psomogyi]! Do you know what is the impact here?
Performance? Correctness?
> 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
>
> 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.
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