Hi, I run Kafka Connect 0.11.2 (Kafka version) with only one instance and 6 tasks in it for a while, it then showed very high CPU usage ~250 % and memory consumption 10 Gb memory and it reported consume group rebalance warning. After the Kafka connect was killed and restarted, it showed the same symptom, very high cpu usage and quickly consume 10 GB memory even there is no tasks running there. The start log showed below.
... Jan 23, 2018 1:07:58 AM org.glassfish.jersey.internal.Errors logErrors WARNING: The following warnings have been detected: WARNING: The (sub)resource method createConnector in org.apache.kafka.connect. runtime.rest.resources.ConnectorsResource contains empty path annotation. WARNING: The (sub)resource method listConnectors in org.apache.kafka.connect.runtime.rest.resources.ConnectorsResource contains empty path annotation. WARNING: The (sub)resource method listConnectorPlugins in org.apache.kafka.connect.runtime.rest.resources.ConnectorPluginsResource contains empty path annotation. WARNING: The (sub)resource method serverInfo in org.apache.kafka.connect. runtime.rest.resources.RootResource contains empty path annotation. [2018-01-23 01:07:58,388] INFO Started o.e.j.s.ServletContextHandler@5b936410{/,null,AVAILABLE} (org.eclipse.jetty.server.handler.ContextHandler:744) [2018-01-23 01:07:58,404] INFO Started ServerConnector@33bef845{HTTP/1.1}{ 0.0.0.0:8083} (org.eclipse.jetty.server.ServerConnector:266) [2018-01-23 01:07:58,405] INFO Started @3854ms (org.eclipse.jetty.server. Server:379) [2018-01-23 01:07:58,406] INFO REST server listening at http://172.17.0.2:8083/, advertising URL http://172.17.0.2:8083/ (org.apache.kafka.connect.runtime.rest.RestServer:150) [2018-01-23 01:07:58,406] INFO Kafka Connect started (org.apache.kafka.connect.runtime.Connect:55) screenshot about the CPU and memory usage is attached as below. [image: Inline image 1] Could you please shed some light here ? Thank you ! -- Regards, Zi-Liang Mail:zlchen....@gmail.com