This PR attempts to fix BEAM-5633 (Python SDK harness logging client failure)
by adding reconnect logic to the logging client. With this patch, we haven't
seen logging failures on our infrastructure.
This issue manifests itself on the server (taskmanager) side with the exception
```
[grpc-default-executor-0] WARN
org.apache.beam.runners.fnexecution.logging.GrpcLoggingService - Logging client
failed unexpectedly.
org.apache.beam.vendor.grpc.v1.io.grpc.StatusRuntimeException: CANCELLED:
cancelled before receiving half close
at
org.apache.beam.vendor.grpc.v1.io.grpc.Status.asRuntimeException(Status.java:517)
at
org.apache.beam.vendor.grpc.v1.io.grpc.stub.ServerCalls$StreamingServerCallHandler$StreamingServerCallListener.onCancel(ServerCalls.java:272)
```
and on the client (python worker) side with
```
E1004 22:08:02.139750634 38 chttp2_transport.cc:1097] Received a GOAWAY
with error code ENHANCE_YOUR_CALM and debug data equal to "too_many_pings"
Exception in thread read_log_control_messages:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/local/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File
"/usr/local/lib/python2.7/site-packages/apache_beam/runners/worker/log_handler.py",
line 65, in <lambda>
target=lambda: self._read_log_control_messages(log_control_messages),
File
"/usr/local/lib/python2.7/site-packages/apache_beam/runners/worker/log_handler.py",
line 111, in _read_log_control_messages
for _ in log_control_iterator:
File "/usr/local/lib/python2.7/site-packages/grpc/_channel.py", line 350, in
next
return self._next()
File "/usr/local/lib/python2.7/site-packages/grpc/_channel.py", line 341, in
_next
raise self
_Rendezvous: <_Rendezvous of RPC that terminated with (StatusCode.UNAVAILABLE,
Socket closed)>
```
At a high-level, the issue is the client is sending the server too many illegal
pings, and the server eventually closes the connection. As the client doesn't
have any retry logic it never recovers from this.
Ideally, there'd be two levels of fixes:
1. Update the server or client gRPC configuration to prevent the client from
sending bad pings or to prevent the server from killing the connection in this
situation (see
[here](https://github.com/grpc/grpc/blob/master/doc/keepalive.md) for more
documentation of this behavior)
2. Make the logging client more robust, reconnecting when the connection is lost
I haven't been able to find a configuration that solves the first part, so that
may need more investigation. Regardless, I think it's worthwhile having
reconnection logic even if that issue is fixed.
------------------------
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Post-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
Lang | SDK | Apex | Dataflow | Flink | Gearpump | Samza | Spark
--- | --- | --- | --- | --- | --- | --- | ---
Go | [](https://builds.apache.org/job/beam_PostCommit_Go_GradleBuild/lastCompletedBuild/)
| --- | --- | --- | --- | --- | ---
Java | [](https://builds.apache.org/job/beam_PostCommit_Java_GradleBuild/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Apex_Gradle/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Gradle/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Gradle/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Gearpump_Gradle/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza_Gradle/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark_Gradle/lastCompletedBuild/)
Python | [](https://builds.apache.org/job/beam_PostCommit_Python_Verify/lastCompletedBuild/)
| --- | [](https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/)
</br> [](https://builds.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Python_VR_Flink/lastCompletedBuild/)
| --- | --- | ---
[ Full content available at: https://github.com/apache/beam/pull/6593 ]
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