Could not read 4 bytes from stream (not readable)

[yuchao86]

╭─root@dev78 ~/Lab/kafka-php/src ‹master_›
╰─➤ ls
examples lib tests
╭─root@dev78 ~/Lab/kafka-php/src ‹master_›
╰─➤ php examples/consume.php

ERROR: Kafka_Exception_Socket_EOF: Could not read 4 bytes from stream (not readable)
#0 /root/Lab/kafka-php/src/lib/Kafka/SimpleConsumer.php(216): Kafka_Socket->read(4, true)
#1 /root/Lab/kafka-php/src/lib/Kafka/SimpleConsumer.php(182): Kafka_SimpleConsumer->getResponseSize()
#2 /root/Lab/kafka-php/src/examples/consume.php(46): Kafka_SimpleConsumer->fetch(Object(Kafka_FetchRequest))
#3 {main}

ERROR: Kafka_Exception_Socket_EOF: Could not read 4 bytes from stream (not readable)
#0 /root/Lab/kafka-php/src/lib/Kafka/SimpleConsumer.php(216): Kafka_Socket->read(4, true)
#1 /root/Lab/kafka-php/src/lib/Kafka/SimpleConsumer.php(182): Kafka_SimpleConsumer->getResponseSize()
#2 /root/Lab/kafka-php/src/examples/consume.php(46): Kafka_SimpleConsumer->fetch(Object(Kafka_FetchRequest))
#3 {main}

ERROR: Kafka_Exception_Socket_EOF: Could not read 4 bytes from stream (not readable)
#0 /root/Lab/kafka-php/src/lib/Kafka/SimpleConsumer.php(216): Kafka_Socket->read(4, true)
#1 /root/Lab/kafka-php/src/lib/Kafka/SimpleConsumer.php(182): Kafka_SimpleConsumer->getResponseSize()
#2 /root/Lab/kafka-php/src/examples/consume.php(46): Kafka_SimpleConsumer->fetch(Object(Kafka_FetchRequest))
#3 {main}

^Z
[3] + 24000 suspended php examples/consume.php