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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