[jira] [Created] (KAFKA-5641) Metadata request should be allowed to send no regardless of value for max.in.flight.requests.per.connection

["huxihx (JIRA)" <ji...@apache.org>]

huxihx created KAFKA-5641:
-----------------------------

             Summary: Metadata request should be allowed to send no regardless of value for max.in.flight.requests.per.connection
                 Key: KAFKA-5641
                 URL: https://issues.apache.org/jira/browse/KAFKA-5641
             Project: Kafka
          Issue Type: Improvement
          Components: producer 
    Affects Versions: 0.11.0.0
            Reporter: huxihx


Metadata request might not be able to be sent when `max.in.flight.requests.per.connection` is set to 1 and there is already an inflight request in the same node's queue, as show below:
{code:title=NetworkClient.java|borderStyle=solid}
private long maybeUpdate(long now, Node node) {
            String nodeConnectionId = node.idString();
            if (canSendRequest(nodeConnectionId)) {
            ......
            }
{code}

However, setting `max.in.flight.requests.per.connection` to 1 actually means no out-of-order for the produced records, Metadata requests should have no related with this config. We don't have to check the inflight request's queue size when sending Metadata request.

[~ijuma] Does it make any sense? If yes, I will work on it.



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