[7.x][ML] Better interrupt handling during named pipe connection #1324
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This change fixes two related issues with named pipe connection when the controller process first starts up: 1. If the ES JVM dies before the controller connects its logging named pipe then since elastic/elasticsearch#56491 the resulting errors from the controller process will be seen in the ES stderr file. There is a change to the logging to make it clearer that the controller didn't fail, but exited due to the ES JVM disappearing. 2. Interrupted system calls while connecting the named pipes could cause the pipes to unnecessarily fail to connect. There is a change to retry the calls on getting an EINTR error unless the interrupt was caused by the functionality of controller that kills off the connection attempts if the ES JVM dies (i.e. the scenario described in point 1). Backport of elastic#1311
droberts195
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This change fixes two related issues with named pipe connection
when the controller process first starts up:
named pipe then since Prevent unexpected native controller output hanging the process elasticsearch#56491 the resulting
errors from the controller process will be seen in the ES
stderr file. There is a change to the logging to make it
clearer that the controller didn't fail, but exited due to
the ES JVM disappearing.
could cause the pipes to unnecessarily fail to connect. There
is a change to retry the calls on getting an EINTR error unless
the interrupt was caused by the functionality of controller
that kills off the connection attempts if the ES JVM dies (i.e.
the scenario described in point 1).
Backport of #1311