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https://issues.apache.org/jira/browse/HBASE-18006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enis Soztutar updated HBASE-18006:
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Attachment: hbase-18006-test.patch
Just attaching a demonstration patch which causes the test to fail. It does a
move region after caching the region so that the openScanner() RPC call gets a
{{UnknownRegionException}}.
I think I know how to fix it, let me attempt a full patch next week.
> AsyncClientScanner does not retry openScan RPCs
> -----------------------------------------------
>
> Key: HBASE-18006
> URL: https://issues.apache.org/jira/browse/HBASE-18006
> Project: HBase
> Issue Type: Bug
> Reporter: Enis Soztutar
> Priority: Critical
> Fix For: 2.0.0
>
> Attachments: hbase-18006-test.patch
>
>
> I have been reading the code for the new async scan paths excessively, and
> noticed that there is a problem in the retrying layer for openScan RPCs.
> In AsyncClientScanner#callOpenScanner() we are doing a open scan RPC. The
> retrying logic comes from using the single rpc retrying caller in
> openScanner(). However, we have the logic for failing the scanner if any of
> the RPC calls here:
> {code}
> stub.scan(controller, request, resp -> {
> if (controller.failed()) {
> future.completeExceptionally(controller.getFailed());
> return;
> }
> future.complete(new OpenScannerResponse(loc, isRegionServerRemote,
> stub, controller, resp));
> });
> {code}
> So, if the open scan gets an UnknownScannerException or something, instead of
> retrying, it just fails the whole scan.
> [~Apache9] FYI.
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