kafka启动报错:java.lang.OutOfMemoryError: Map failed

kafka原来启动运行的时候，集群启动时正常的，今天在用kafka测试的时候，启动kafka集群，其中的两个节点启动失败，报错如下：

java.io.IOException: Map failed
        at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:944)
        at kafka.log.AbstractIndex$$anonfun$resize$1.apply(AbstractIndex.scala:115)
        at kafka.log.AbstractIndex$$anonfun$resize$1.apply(AbstractIndex.scala:105)
        at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:213)
        at kafka.log.AbstractIndex.resize(AbstractIndex.scala:105)
        at kafka.log.LogSegment.recover(LogSegment.scala:256)
        at kafka.log.Log.kafka$log$Log$$recoverSegment(Log.scala:342)
        at kafka.log.Log.recoverLog(Log.scala:427)
        at kafka.log.Log.loadSegments(Log.scala:402)
        at kafka.log.Log.<init>(Log.scala:186)
        at kafka.log.Log$.apply(Log.scala:1609)
        at kafka.log.LogManager$$anonfun$loadLogs$2$$anonfun$5$$anonfun$apply$12$$anon
fun$apply$1.apply$mcV$sp(LogManager.scala:172)
        at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:57)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1
149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:
624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.OutOfMemoryError: Map failed
        at sun.nio.ch.FileChannelImpl.map0(Native Method)
        at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:941)
        ... 17 more

感觉好奇怪。。。
在网上查看原因，大部分说是需要将CentOS32位升级为64位的(小弟的确实是32位的)。看了别人说得，升级有风险，遂放弃。又有说需要将kafka的启动脚本（kafka-server-start.sh ）中设置的默认的heap大小设置为6G。

#!/bin/bash
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

if [ $# -lt 1 ];
then
        echo "USAGE: $0 [-daemon] server.properties [--override property=value]*"
        exit 1
fi
base_dir=$(dirname $0)

if [ "x$KAFKA_LOG4J_OPTS" = "x" ]; then
    export KAFKA_LOG4J_OPTS="-Dlog4j.configuration=file:$base_dir/../config/log4j.properties"
fi

if [ "x$KAFKA_HEAP_OPTS" = "x" ]; then
    export KAFKA_HEAP_OPTS="-Xmx1G -Xms1G"
fi

EXTRA_ARGS=${EXTRA_ARGS-'-name kafkaServer -loggc'}

COMMAND=$1
case $COMMAND in

`可以看到，默认的最大为``1G,于是将其大小改为6G。继续启动，结果：

[root@spark1 bin]# Invalid initial heap size: -Xms6G
The specified size exceeds the maximum representable size.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

太大了，超出了最大值。
那就改为3G，继续启动，当然，继续上次的错误，太大了。
。。。
那就将其大小改为512M！

#!/bin/bash
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

if [ $# -lt 1 ];
then
        echo "USAGE: $0 [-daemon] server.properties [--override property=value]*"
        exit 1
fi
base_dir=$(dirname $0)

if [ "x$KAFKA_LOG4J_OPTS" = "x" ]; then
    export KAFKA_LOG4J_OPTS="-Dlog4j.configuration=file:$base_dir/../config/log4j.properties"
fi

if [ "x$KAFKA_HEAP_OPTS" = "x" ]; then
    export KAFKA_HEAP_OPTS="-Xmx1G -Xms512M"
fi

EXTRA_ARGS=${EXTRA_ARGS-'-name kafkaServer -loggc'}

COMMAND=$1
case $COMMAND in

启动OK！
我这电脑配置真是渣(8G内存，三个节点)。