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https://issues.apache.org/jira/browse/IMPALA-8659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16863156#comment-16863156
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ASF subversion and git services commented on IMPALA-8659:
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Commit 8ee18c3b7736e02ef76507162ed2592ba11d16e3 in impala's branch
refs/heads/master from Tim Armstrong
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=8ee18c3 ]
IMPALA-8659: Allow self-RPCs for KRPC to go via loopback
Adds a flag --rpc_use_loopback that causes two differences
in behaviour when enabled:
1. KRPC will listen on all interfaces, i.e. bind the socket
to INADDR_ANY.
2. KRPC RPCs to --hostname are sent to 127.0.0.1 instead of
the IP (maybe external) that --hostname resolves to.
There is no change in default behaviour, except in containers,
where this flag is enabled by default.
Testing:
* Added a custom cluster test, which runs in exhaustive,
as a sanity test for the behaviour of the flag.
Change-Id: I9dbd477769ed49c05e624f06da4e51afaaf1670d
Reviewed-on: http://gerrit.cloudera.org:8080/13592
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> Allow self-RPCs for KRPC to go via loopback
> -------------------------------------------
>
> Key: IMPALA-8659
> URL: https://issues.apache.org/jira/browse/IMPALA-8659
> Project: IMPALA
> Issue Type: Improvement
> Components: Distributed Exec
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
>
> Our KRPC implementation currently sends all RPCs, even those to the current
> host, through a single external IP. There are some cases why we might not
> want to do this. The immediately motivating issue for me is bugs in some
> tooling that cause self-RPCs on external IPs to fail. See
> https://github.com/istio/istio/issues/12551.
> There are really two parts to this:
> * Listening on the 127.0.0.1 interface
> * Intercepting RPCs to the external IP and sending them to 127.0.0.1 instead.
> An alternative solution would be to completely bypass the RPC stack, but that
> would be far more invasive.
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