[jira] [Created] (KAFKA-8508) saslClient failed to initialize properly: it's null.

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

Caroline Liu created KAFKA-8508:
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             Summary: saslClient failed to initialize properly: it's null.
                 Key: KAFKA-8508
                 URL: https://issues.apache.org/jira/browse/KAFKA-8508
             Project: Kafka
          Issue Type: Bug
          Components: zkclient
    Affects Versions: 2.0.1
            Reporter: Caroline Liu


After a network issue caused the last ISR to fail connecting to ZooKeeper, the attempt to reconnect failed with an ArrayIndexOutOfBoundsException. 
{code:java}
2019-05-31 15:54:38,823 [zk-session-expiry-handler0-SendThread(zk2-1:2181)] WARN (org.apache.zookeeper.ClientCnxn) - Client session timed out, have not heard from server in 20010ms for sessionid 0x15000011b2b1042a
2019-05-31 15:54:38,823 [zk-session-expiry-handler0-SendThread(zk2-1:2181)] INFO (org.apache.zookeeper.ClientCnxn) - Client session timed out, have not heard from server in 20010ms for sessionid 0x15000011b2b1042a, closing socket connection and attempting reconnect
2019-05-31 15:54:39,702 [zk-session-expiry-handler0-SendThread(zk1-2:2181)] INFO (org.apache.zookeeper.client.ZooKeeperSaslClient) - Client will use DIGEST-MD5 as SASL mechanism.
2019-05-31 15:54:39,702 [zk-session-expiry-handler0-SendThread(zk1-2:2181)] ERROR (org.apache.zookeeper.client.ZooKeeperSaslClient) - Exception while trying to create SASL client: java.lang.ArrayIndexOutOfBoundsException: 0
2019-05-31 15:54:39,702 [zk-session-expiry-handler0-SendThread(zk1-2:2181)] INFO (org.apache.zookeeper.ClientCnxn) - Opening socket connection to server zk1-2/1.3.6.1:2181. Will attempt to SASL-authenticate using Login Context section 'Client'
2019-05-31 15:54:39,702 [zk-session-expiry-handler0-SendThread(zk1-2:2181)] INFO (org.apache.zookeeper.ClientCnxn) - Socket connection established to zk1-2/1.3.6.1:2181, initiating session
2019-05-31 15:54:39,703 [zk-session-expiry-handler0-SendThread(zk1-2:2181)] INFO (org.apache.zookeeper.ClientCnxn) - Session establishment complete on server zk1-2/1.3.6.1:2181, sessionid = 0x15000011b2b1042a, negotiated timeout = 30000
2019-05-31 15:54:39,703 [zk-session-expiry-handler0-SendThread(zk1-2:2181)] ERROR (org.apache.zookeeper.ClientCnxn) - SASL authentication with Zookeeper Quorum member failed: javax.security.sasl.SaslException: saslClient failed to initialize properly: it's null.{code}
Kafka was "not live" in zookeeper and had to be manually restarted to recover from this error. It would be better if the last ISR could retry.



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