Henry Robinson created KUDU-2041:
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Summary: Connection negotiation may deadlock
Key: KUDU-2041
URL: https://issues.apache.org/jira/browse/KUDU-2041
Project: Kudu
Issue Type: Bug
Reporter: Henry Robinson
Assignee: Henry Robinson
Priority: Critical
Connection establishment may deadlock. Both client and server negotiation tasks
are blocking. Assume there is only one thread available for negotiation
processing. If servers A and B try to connect to each other, and submit the
client-side task to their threads first, the server-side task required to
complete those tasks will be blocked behind the client tasks, and will never be
executed - hence the client tasks will never complete.
This happens in practice on a 20-node cluster which tries to connect the
complete graph of connections between nodes in a burst, with 4 threads
available for negotiation.
An easy fix is to partition the resources for server and client negotiations,
by using separate thread pools.
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