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https://issues.apache.org/jira/browse/FLINK-29572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624813#comment-17624813
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Xintong Song commented on FLINK-29572:
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bq. If this works, TM will report its address as 127.0.0.1:6223. JM can RPC
this address as well. But as soon as you have multiple TMs, all of them will
report their address as 127.0.0.1:6223. Obviously only one will succeed.
You said that it would work if there's only one TM using a 127.0.0.1 address.
Then I don't understand why it couldn't work with multiple TMs using the same
address but different ports. A {{TaskManagerLocation}} is uniquely by its
address *and* port. Having multiple TMs using the same IP address with
different ports should not confuse JM.
> Flink Task Manager skip loopback interface for resource manager registration
> ----------------------------------------------------------------------------
>
> Key: FLINK-29572
> URL: https://issues.apache.org/jira/browse/FLINK-29572
> Project: Flink
> Issue Type: Bug
> Components: API / Core
> Affects Versions: 1.15.2
> Environment: Flink 1.15.2
> Kubernetes with Istio Proxy
> Reporter: Kevin Li
> Priority: Major
>
> Currently Flink Task Manager use different local interface to bind to connect
> to Resource Manager. First one is Loopback interface. Normally if Job Manager
> is running on remote host/container, using loopback interface to connect will
> fail and it will pick up correct IP address.
> However, if Task Manager is running with some proxy, loopback interface can
> connect to remote host as well. This will result 127.0.0.1 reported to
> Resource Manager during registration, even Job Manager/Resource Manager runs
> on remote host, and problem will happen. For us, only one Task Manager can
> register in this case.
> I suggest adding configuration to skip Loopback interface check if we know
> Job/Resource Manager is running on remote host/container.
>
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