Kafka常見錯誤：
1）Malformed line in offset checkpoint file
cat logs/server.log.2020-03-27-12
[2020-03-27 12:59:50,150] ERROR [KafkaApi-100] Error when handling request {controller_id=100,controller_epoch=4,partition_states=[{topic=test03,partition=0,controller_epoch=3,leader=100,leader_epoch=2,isr=[100],zk_version=2,replicas=[100]},{topic=test03,partition=3,controller_epoch=3,leader=100,leader_epoch=2,isr=[100],zk_version=2,replicas=[100]},{topic=test03,partition=2,controller_epoch=3,leader=100,leader_epoch=2,isr=[100],zk_version=2,replicas=[100]},{topic=test03,partition=1,controller_epoch=3,leader=100,leader_epoch=2,isr=[100],zk_version=2,replicas=[100]}],live_leaders=[{id=100,host=192.168.100.148,port=9092}]} (kafka.server.KafkaApis)
java.io.IOException: Malformed line in offset checkpoint file: '
at kafka.server.OffsetCheckpoint.malformedLineException$1(OffsetCheckpoint.scala:81)
at kafka.server.OffsetCheckpoint.liftedTree2$1(OffsetCheckpoint.scala:104)
at kafka.server.OffsetCheckpoint.read(OffsetCheckpoint.scala:86)
at kafka.cluster.Partition.getOrCreateReplica(Partition.scala:98)
at kafka.cluster.Partition$$anonfun$4$$anonfun$apply$2.apply(Partition.scala:176)
at kafka.cluster.Partition$$anonfun$4$$anonfun$apply$2.apply(Partition.scala:176)
at scala.collection.mutable.HashSet.foreach(HashSet.scala:78)
at kafka.cluster.Partition$$anonfun$4.apply(Partition.scala:176)
at kafka.cluster.Partition$$anonfun$4.apply(Partition.scala:170)
at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:231)
at kafka.utils.CoreUtils$.inWriteLock(CoreUtils.scala:239)
at kafka.cluster.Partition.makeLeader(Partition.scala:170)
at kafka.server.ReplicaManager$$anonfun$makeLeaders$4.apply(ReplicaManager.scala:699)
at kafka.server.ReplicaManager$$anonfun$makeLeaders$4.apply(ReplicaManager.scala:698)
at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:99)
at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:99)
at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:230)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:40)
at scala.collection.mutable.HashMap.foreach(HashMap.scala:99)
at kafka.server.ReplicaManager.makeLeaders(ReplicaManager.scala:698)
at kafka.server.ReplicaManager.becomeLeaderOrFollower(ReplicaManager.scala:644)
at kafka.server.KafkaApis.handleLeaderAndIsrRequest(KafkaApis.scala:144)
at kafka.server.KafkaApis.handle(KafkaApis.scala:80)
at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:60)
at java.lang.Thread.run(Thread.java:745)
[2020-03-27 12:59:50,159] INFO [ReplicaFetcherManager on broker 100] Removed fetcher for partitions [test03,3],[test03,0],[test03,1],[test03,2] (kafka.server.ReplicaFetcherManager)
可能原因：有可能增加了分區後，kafka就不能找到分區leader了，報該錯誤。kafka會在log.dirs配置項的路徑下維護這兩個和offset相關的值：
文件1）replication-offset-checkpoint
文件2）recovery-point-offset-checkpoint
解決辦法：刪除所有log文件夾（查看config/server.properties中的log.dirs配置路徑）下的這兩個文件即可。