ZOOKEEPER-2649: Add more session and authentication information to SASL success and failure logs

…ASL success and failure logs.

Another one from the backlogs - created in 2016, no activity since 6 months.

JIRA: https://issues.apache.org/jira/browse/ZOOKEEPER-2649

cc eolivelli

Author: Ghatage <ghatageanup@gmail.com>

Reviewers: Enrico Olivelli <eolivelli@apache.org>, Mate Szalay-Beko <symat@apache.org>, Damien Diederen <ddiederen@apache.org>

Closes #1498 from Ghatage/ZOOKEEPER-2649

zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServer.java

@@ -1601,8 +1601,9 @@ public class ZooKeeperServer implements SessionExpirer, ServerStats.Provider {
                 }
             }
             if (authReturn == KeeperException.Code.OK) {
-                LOG.debug("Authentication succeeded for scheme: {}", scheme);
-                LOG.info("auth success {}", cnxn.getRemoteSocketAddress());
+                LOG.info("Session 0x{}: auth success for scheme {} and address {}",
+                        Long.toHexString(cnxn.getSessionId()), scheme,
+                        cnxn.getRemoteSocketAddress());
                 ReplyHeader rh = new ReplyHeader(h.getXid(), 0, KeeperException.Code.OK.intValue());
                 cnxn.sendResponse(rh, null, null);
             } else {
@@ -1663,7 +1664,8 @@ public class ZooKeeperServer implements SessionExpirer, ServerStats.Provider {
                 responseToken = saslServer.evaluateResponse(clientToken);
                 if (saslServer.isComplete()) {
                     String authorizationID = saslServer.getAuthorizationID();
-                    LOG.info("adding SASL authorization for authorizationID: {}", authorizationID);
+                    LOG.info("Session 0x{}: adding SASL authorization for authorizationID: {}",
+                            Long.toHexString(cnxn.getSessionId()), authorizationID);
                     cnxn.addAuthInfo(new Id("sasl", authorizationID));
                     if (System.getProperty("zookeeper.superUser") != null
                         && authorizationID.equals(System.getProperty("zookeeper.superUser"))) {