Mate Szalay-Beko created ZOOKEEPER-3838:
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Summary: Async handling of quorum connection requests, including
SSL handshakes
Key: ZOOKEEPER-3838
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3838
Project: ZooKeeper
Issue Type: Improvement
Affects Versions: 3.5.8, 3.6.1
Reporter: Mate Szalay-Beko
We are facing issues when the leader election takes too long, as the connection
initiation between quorum members takes too much time when QuorumSSL is used.
In the current implementation, we handle the connection requests (and SASL
authentications) asynchronously when QuorumSASL is enabled. However, the
asynchronous handling will not be enabled if only QuorumSSL is enabled (but
QuorumSASL is disabled). And anyway, as far as I can see, the SSL handshake
happens before the current asynchronous part.
See:
https://github.com/apache/zookeeper/blob/a908001be9641d78040b1954acb0cd3a8e9e42c2/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumCnxManager.java#L1058
The goal would be to move the SSL handshake to the asynchronous code part, and
also to make the connection request handling always asynchronous regardless of
the QuorumSASL / QuorumSSL configs.
Please note, we already did this for the connection initiation part in
ZOOKEEPER-3756.
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