com.esotericsoftware.kryo.KryoException: Buffer overflow. Available: 0, required: 1

com.esotericsoftware.kryo.KryoException: Buffer overflow. Available: 0, required: 1
    at com.esotericsoftware.kryo.io.Output.require(Output.java:138)
    at com.esotericsoftware.kryo.io.Output.writeBytes(Output.java:220)
    at com.esotericsoftware.kryo.io.Output.writeBytes(Output.java:206)
    at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ByteArraySerializer.write(DefaultArraySerializers.java:29)
    at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ByteArraySerializer.write(DefaultArraySerializers.java:18)
    at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:549)
    at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:312)
    at com.esotericsoftware.kryo.serializers.DefaultArraySerializers$ObjectArraySerializer.write(DefaultArraySerializers.java:293)
    at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)
    at org.apache.spark.serializer.KryoSerializerInstance.serialize(KryoSerializer.scala:161)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:213)

原因是Kryo设置的缓存区太小

序列化写数据的时候：

    Output output = new Output(128, 10240);
    kryo.writeClassAndObject(output, obj);

看OutPut的构造函数

    public Output (int bufferSize, int maxBufferSize) {
        if (maxBufferSize < -1) throw new IllegalArgumentException("maxBufferSize cannot be < -1: " + maxBufferSize);
        this.capacity = bufferSize;
        this.maxCapacity = maxBufferSize == -1 ? Integer.MAX_VALUE : maxBufferSize;
        buffer = new byte[bufferSize];
    }

知道这里设置的buffer的初始大小和最大值，我这边设置的最大是10240byte，也就是10k；

所以这里调整buffer大小就可以了。