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From "Stanislav Lukyanov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-10808) Discovery message queue may build up with TcpDiscoveryMetricsUpdateMessage
Date Mon, 24 Dec 2018 17:08:00 GMT
Stanislav Lukyanov created IGNITE-10808:
-------------------------------------------

             Summary: Discovery message queue may build up with TcpDiscoveryMetricsUpdateMessage
                 Key: IGNITE-10808
                 URL: https://issues.apache.org/jira/browse/IGNITE-10808
             Project: Ignite
          Issue Type: Bug
            Reporter: Stanislav Lukyanov
         Attachments: IgniteMetricsOverflowTest.java

A node receives a new metrics update message every `metricsUpdateFrequency` milliseconds,
and the message will be put at the top of the queue (because it is a high priority message).
If processing one message takes more than `metricsUpdateFrequency` then multiple `TcpDiscoveryMetricsUpdateMessage`
will be in the queue. A long enough delay (e.g. caused by a network glitch or GC) may lead
to the queue building up tens of metrics update messages which are essentially useless to
be processed. Finally, if processing a message on average takes a little more than `metricsUpdateFrequency`
(even for a relatively short period of time, say, for a minute due to network issues) then
the message worker will end up processing only the metrics updates and the cluster will essentially
hang.

Reproducer is attached. In the test, the queue first builds up and then very slowly being
teared down, causing "Failed to wait for PME" messages.

Need to change ServerImpl's SocketReader not to put another metrics update message to the
top of the queue if it already has one (or replace the one on the top with new one).



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