frederic-kneier commented on pull request #14088:
URL: https://github.com/apache/pulsar/pull/14088#issuecomment-1027201801
If you pipe the command to nc the input stream is closed instantly which
leads to nc terminating in certain conditions even before the server is able to
send the reply. This leads to an empty output which then leads to a failed
health check. This behavior seems to be different for different version of nc
(OpenBSD, Linux). Since the cause of the problem is a race condition the "-q 1"
will wait one second before the program terminates and the server is able to
send the reply. This behavior is reproducable on certain Kubernetes clusters
with small nodes and seems to be fixed with this change.
for run in {1..10}; do echo ruok | nc localhost 2181; done =>
imokimokimokimokimok
for run in {1..10}; do echo ruok | nc -q 1 localhost 2181; done =>
imokimokimokimokimokimokimokimokimokimok
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