Jun Rao created KAFKA-3292:
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Summary: ClientQuotaManager.getOrCreateQuotaSensors() may return a
null ClientSensors.throttleTimeSensor
Key: KAFKA-3292
URL: https://issues.apache.org/jira/browse/KAFKA-3292
Project: Kafka
Issue Type: Bug
Reporter: Jun Rao
Fix For: 0.10.0.0
It seems that the following situation is possible. Two threads try to call
getOrCreateQuotaSensors() at the same time. Initially, quotaSensor is not
registered, then both threads try to get the write lock to register
quotaSensor. Thread 1 grabs the write lock and registers both quotaSensor and
throttleTimeSensor, and then releases the lock. Thread 2 grabs the write lock
again and reads a non-null quotaSensor. It then skips the logic to register
throttleTimeSensor and returns. However, the returned throttleTimeSensor will
be null.
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