Seweryn Habdank-Wojewodzki created KAFKA-6777:
Summary: Wrong reaction on Out Of Memory situation
Issue Type: Bug
Affects Versions: 1.0.0
Reporter: Seweryn Habdank-Wojewodzki
We already encountered many times problems related to Out Of Memory situation
in Kafka Broker and streaming clients.
The scenario is the following.
When Kafka Broker (or Streaming Client) is under load and has too less memory,
there are no errors in server logs. One can see some cryptic entries in GC
logs, but they are definitely not self-explaining.
Kafka Broker (and Streaming Clients) works further. Later we see in JMX
monitoring, that JVM uses more and more time in GC. In our case it grows from
e. 1% to 80%-90% of CPU time is used by GC.
Next software collapses into zombie mode – process in not ending. In such a
case I would expect, that process is crashing (e.g. got SIG SEGV). Even worse
Kafka treats such a zombie process normal and somewhat sends messages, which
are in fact getting lost, also the cluster is not excluding broken nodes. The
question is how to configure Kafka to really terminate the JVM and not remain
in zombie mode, to give a chance to other nodes to know, that something is dead.
I would expect that in Out Of Memory situation JVM is ended if not graceful
than at least process is crashed.
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