Oversized ZNode Buffer

Symptom

The ZooKeeper node (ZNode) cannot be deleted when ZooKeeper is cleared, and the message "Packet len XXX is out of range!" is displayed.

Cause Analysis

After a connection to ZooKeeper is created, read and write operations are performed on a ZNode. To improve the throughput, ZooKeeper checks whether the data volume of the node exceeds the value of jute.maxbuffer. If yes, ZooKeeper raises an exception.

Solution

• Reduce the data volume of the node to be operated to a value less than the default 4 MB.
• Increase the value of jute.maxbuffer in the /opt/apache-zookeeper-3.6.3-bin/bin/zkCli.sh file.

  

  "$JAVA" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" "-Dzookeeper.log.file=${ZOO_LOG_FILE}" \
       "-Djute.maxbuffer=41943040" \
       -cp "$CLASSPATH" $CLIENT_JVMFLAGS $JVMFLAGS \
       org.apache.zookeeper.ZooKeeperMain "$@"