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Posted to issues@hbase.apache.org by "Duo Zhang (JIRA)" <ji...@apache.org> on 2019/02/02 03:54:00 UTC

[jira] [Created] (HBASE-21827) CompletableFuture may wrap the original Throwable with CompletionException while propagating it

Duo Zhang created HBASE-21827:
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             Summary: CompletableFuture may wrap the original Throwable with CompletionException while propagating it
                 Key: HBASE-21827
                 URL: https://issues.apache.org/jira/browse/HBASE-21827
             Project: HBase
          Issue Type: Bug
          Components: asyncclient, Client
            Reporter: Duo Zhang
            Assignee: Duo Zhang
             Fix For: 3.0.0, 2.2.0, 2.3.0


See the stack overflow post

https://stackoverflow.com/questions/49230980/does-completionstage-always-wrap-exceptions-in-completionexception

It seems that, for a chain of CompletableFutures, the first child will receive the original exception, and the latter ones will receive a CompletionException, which is the wrapper of the original exception.

This is also what I observed when debugging HBASE-21779. We need to fix this, at least, we should unwrap it when we want to return exceptions to users.



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