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https://issues.apache.org/jira/browse/IMPALA-8687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-8687.
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Resolution: Won't Fix
I think we can wait for IMPALA-7984 instead of doing a workaround.
> --rpc_use_loopback may not work for runtime filter RPCs
> -------------------------------------------------------
>
> Key: IMPALA-8687
> URL: https://issues.apache.org/jira/browse/IMPALA-8687
> Project: IMPALA
> Issue Type: Sub-task
> Components: Distributed Exec
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
>
> Following on from IMPALA-8659, we may have some cases where impalads do
> self-RPCs via the thrift internal service IMPALA-7984. This JIRA is to
> investigate if this is a problem, and to fix it (either by intercepting
> self-RPCs in Thrift or by making code changes to avoid it).
> Basic join where global runtime filters should apply:
> {code}
> select straight_join count(*)
> from alltypes t1 join /*+ shuffle */ alltypes t2 on t1.id = t2.id
> where t2.string_col = '1';
> {code}
> Interesting cases
> * Dedicated coordinator with distributed plan ==> expect that all joins and
> scans run on executors and all filter aggregation happens on coordinator.
> * Single node plan (num_nodes=1) ==> expect that all filters are local ==> no
> RPCs required
> * Combined coordinator/executor with distributed plan ==> may do self-RPC
> So I think in the dedicated coordinator/executor case we're ok. Note that
> IMPALA-3825 may violate the above assumptions.
> I can pretty easily reproduce the issue on combined coordinators/executors
> with verbosity level 2. This is a log excerpt from the Impalad
> tarmstrong-box:22000
> {noformat}
> I0619 17:28:00.913919 25525 client-cache.cc:47]
> GetClient(tarmstrong-box:22000)
> I0619 17:28:00.913924 25525 client-cache.cc:57] GetClient(): returning cached
> client for tarmstrong-box:22000
> I0619 17:28:00.914047 25425 rpc-trace.cc:202] RPC call:
> ImpalaInternalService.PublishFilter(from ::ffff:127.0.0.1:41902)
> I0619 17:28:00.914587 25425 query-exec-mgr.cc:98] QueryState:
> query_id=624be7fc0bc0e122:0fbdc17200000000 refcnt=6
> I0619 17:28:00.914597 25425 fragment-instance-state.cc:511] PublishFilter():
> instance_id=624be7fc0bc0e122:0fbdc17200000002 filter_id=0
> I0619 17:28:00.915010 25425 query-exec-mgr.cc:162] ReleaseQueryState():
> query_id=624be7fc0bc0e122:0fbdc17200000000 refcnt=6
> I0619 17:28:00.915038 25425 rpc-trace.cc:212] RPC call:
> backend:ImpalaInternalService.PublishFilter from ::ffff:127.0.0.1:41902 took
> 1.000ms
> I0619 17:28:00.915043 25525 client-cache.cc:152] Releasing client for
> tarmstrong-box:22000 back to cache
> I0619 17:28:00.915175 25525 rpc-trace.cc:212] RPC call:
> backend:ImpalaInternalService.UpdateFilter from ::ffff:127.0.0.1:41930 took
> 5.000ms
> I0619 17:28:00.922312 25437 scan-node.cc:192]
> 624be7fc0bc0e122:0fbdc17200000002] Filters arrived. Waited 351ms
> {noformat}
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