- 问题信息：
公司服务器，kafka启动中发现有以下错误信:
java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:938)
at kafka.log.AbstractIndex.<init>(AbstractIndex.scala:124)
at kafka.log.TimeIndex.<init>(TimeIndex.scala:54)
at kafka.log.LazyIndex$.$anonfun$forTime$1(LazyIndex.scala:109)
at kafka.log.LazyIndex.$anonfun$get$1(LazyIndex.scala:63)
at kafka.log.LazyIndex.get(LazyIndex.scala:60)
at kafka.log.LogSegment.timeIndex(LogSegment.scala:66)
at kafka.log.LogSegment.resizeIndexes(LogSegment.scala:77)
at kafka.log.LogLoader$.load(LogLoader.scala:164)
at kafka.log.Log$.apply(Log.scala:2087)
at kafka.log.LogManager.$anonfun$getOrCreateLog$1(LogManager.scala:861)
at scala.Option.getOrElse(Option.scala:201)
at kafka.log.LogManager.getOrCreateLog(LogManager.scala:813)
at kafka.cluster.Partition.createLog(Partition.scala:349)
at kafka.cluster.Partition.maybeCreate$1(Partition.scala:324)
at kafka.cluster.Partition.createLogIfNotExists(Partition.scala:331)
at kafka.cluster.Partition.$anonfun$makeLeader$1(Partition.scala:536)
at kafka.cluster.Partition.makeLeader(Partition.scala:520)
at kafka.server.ReplicaManager.$anonfun$makeLeaders$5(ReplicaManager.scala:1577)
at kafka.utils.Implicits$MapExtensionMethods$.$anonfun$forKeyValue$1(Implicits.scala:62)
at scala.collection.mutable.HashMap$Node.foreachEntry(HashMap.scala:633)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:499)
at kafka.server.ReplicaManager.becomeLeaderOrFollower(ReplicaManager.scala:1575)
at kafka.server.KafkaApis.handleLeaderAndIsrRequest(KafkaApis.scala:266)
at kafka.server.KafkaApis.handle(KafkaApis.scala:173)
at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:75)
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:935)
... 26 more
[2022-06-08 11:17:20,609] ERROR [Broker id=0] Error while processing LeaderAndIsr request correlationId 1 received from controller 0 epoch 4 for partition notify-topic-prod-inte-14 (state.change.logger)
java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:938)
at kafka.log.AbstractIndex.<init>(AbstractIndex.scala:124)
at kafka.log.TimeIndex.<init>(TimeIndex.scala:54)
at kafka.log.LazyIndex$.$anonfun$forTime$1(LazyIndex.scala:109)
at kafka.log.LazyIndex.$anonfun$get$1(LazyIndex.scala:63)
at kafka.log.LazyIndex.get(LazyIndex.scala:60)
at kafka.log.LogSegment.timeIndex(LogSegment.scala:66)
at kafka.log.LogSegment.resizeIndexes(LogSegment.scala:77)
at kafka.log.LogLoader$.load(LogLoader.scala:164)
at kafka.log.Log$.apply(Log.scala:2087)
at kafka.log.LogManager.$anonfun$getOrCreateLog$1(LogManager.scala:861)
at scala.Option.getOrElse(Option.scala:201)
at kafka.log.LogManager.getOrCreateLog(LogManager.scala:813)
at kafka.cluster.Partition.createLog(Partition.scala:349)
at kafka.cluster.Partition.maybeCreate$1(Partition.scala:324)
at kafka.cluster.Partition.createLogIfNotExists(Partition.scala:331)
at kafka.cluster.Partition.$anonfun$makeLeader$1(Partition.scala:536)
at kafka.cluster.Partition.makeLeader(Partition.scala:520)
at kafka.server.ReplicaManager.$anonfun$makeLeaders$5(ReplicaManager.scala:1577)
at kafka.utils.Implicits$MapExtensionMethods$.$anonfun$forKeyValue$1(Implicits.scala:62)
at scala.collection.mutable.HashMap$Node.foreachEntry(HashMap.scala:633)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:499)
at kafka.server.ReplicaManager.becomeLeaderOrFollower(ReplicaManager.scala:1575)
at kafka.server.KafkaApis.handleLeaderAndIsrRequest(KafkaApis.scala:266)
at kafka.server.KafkaApis.handle(KafkaApis.scala:173)
at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:75)
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:935)
... 26 more
- 修改方式：
- 修改虚拟内存使用数量
sysctl -w vm.max_map_count=262144 #设置数量 sysctl vm.max_map_count #查看当前数量 - 修改 kafka-server-start 启动时配置 缓存
- 查看 jdk 版本是否为64位
以上信息为，stackoverflow 中查询的，并没有解决 我的问题
4.重装系统，由于采用的公司的虚拟机，就选择重装了一下系统，就可以了。
- 问题原因 ：
jdk在调用 c 进行内存申请时，无法申请到更多内存，就抛出异常。
我用的公司的服务器，内存还有3个G，正常来说不是不会出现这个问题。也不清楚为什么没有申请下来。
对系统函数的调用不清楚了。后续，我在查一下继续更新
mmap64 使用说明：
https://www.ibm.com/docs/en/i/7.2?topic=ssw_ibm_i_72/apis/mmap64.htm
说明介绍：
