kafka内存溢出 java.lang.OutOfMemoryError: Direct buffer memory

kafka版本号：2.3.0；集群：1台，broker：2个；Mem: 16G

错误信息：

[2021-03-14 04:57:49,831] ERROR Processor got uncaught exception. (kafka.network.Processor)
java.lang.OutOfMemoryError: Direct buffer memory
    at java.nio.Bits.reserveMemory(Bits.java:693)
    at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
    at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)
    at sun.nio.ch.Util.getTemporaryDirectBuffer(Util.java:174)
    at sun.nio.ch.IOUtil.read(IOUtil.java:195)
    at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
    at org.apache.kafka.common.network.PlaintextTransportLayer.read(PlaintextTransportLayer.java:103)
    at org.apache.kafka.common.network.NetworkReceive.readFrom(NetworkReceive.java:117)
    at org.apache.kafka.common.network.KafkaChannel.receive(KafkaChannel.java:424)
    at org.apache.kafka.common.network.KafkaChannel.read(KafkaChannel.java:385)
    at org.apache.kafka.common.network.Selector.attemptRead(Selector.java:651)
    at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:572)
    at org.apache.kafka.common.network.Selector.poll(Selector.java:483)
    at kafka.network.Processor.poll(SocketServer.scala:863)
    at kafka.network.Processor.run(SocketServer.scala:762)
    at java.lang.Thread.run(Thread.java:745)

尝试过在kafka-run-class.sh 脚本内添加 -XX:MaxDirectMemorySize=512M，并逐步增加数值一直到4096M,同时两个broker配置 KAFKA_HEAP_OPTS="-Xmx6G -Xms6G"由1G逐步增加到6G，依然出现此报错。

请博主帮助分析一下！