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

["Duo Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-21827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duo Zhang updated HBASE-21827:
------------------------------
    Fix Version/s:     (was: 2.3.0)
                       (was: 2.2.0)
                       (was: 3.0.0)

> 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
>            Priority: Critical
>
> 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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