apache-kafka - kafka 打开的文件太多

Question

你有没有遇到过kafka的类似问题？我收到此错误:打开的文件太多。我不知道为什么。以下是一些日志:

[2018-08-27 10:07:26,268] ERROR Error while deleting the clean shutdown file in dir /home/weihu/kafka/kafka/logs (kafka.server.LogD)
java.nio.file.FileSystemException: /home/weihu/kafka/kafka/logs/BC_20180821_1_LOCATION-87/leader-epoch-checkpoint: Too many open fis
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:91)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
        at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
        at java.nio.file.Files.newByteChannel(Files.java:361)
        at java.nio.file.Files.createFile(Files.java:632)
        at kafka.server.checkpoints.CheckpointFile.<init>(CheckpointFile.scala:45)
        at kafka.server.checkpoints.LeaderEpochCheckpointFile.<init>(LeaderEpochCheckpointFile.scala:62)
        at kafka.log.Log.initializeLeaderEpochCache(Log.scala:278)
        at kafka.log.Log.<init>(Log.scala:211)
        at kafka.log.Log$.apply(Log.scala:1748)
        at kafka.log.LogManager.loadLog(LogManager.scala:265)
        at kafka.log.LogManager.$anonfun$loadLogs$12(LogManager.scala:335)
        at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:62)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
[2018-08-27 10:07:26,268] ERROR Error while deleting the clean shutdown file in dir /home/weihu/kafka/kafka/logs (kafka.server.LogD)
java.nio.file.FileSystemException: /home/weihu/kafka/kafka/logs/BC_20180822_PARSE-136/leader-epoch-checkpoint: Too many open files
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:91)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
        at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
        at java.nio.file.Files.newByteChannel(Files.java:361)
        at java.nio.file.Files.createFile(Files.java:632)
        at kafka.server.checkpoints.CheckpointFile.<init>(CheckpointFile.scala:45)
        at kafka.server.checkpoints.LeaderEpochCheckpointFile.<init>(LeaderEpochCheckpointFile.scala:62)
        at kafka.log.Log.initializeLeaderEpochCache(Log.scala:278)
        at kafka.log.Log.<init>(Log.scala:211)
        at kafka.log.Log$.apply(Log.scala:1748)
        at kafka.log.LogManager.loadLog(LogManager.scala:265)
        at kafka.log.LogManager.$anonfun$loadLogs$12(LogManager.scala:335)
        at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:62)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
[2018-08-27 10:07:26,269] ERROR Error while deleting the clean shutdown file in dir /home/weihu/kafka/kafka/logs (kafka.server.LogD)
java.nio.file.FileSystemException: /home/weihu/kafka/kafka/logs/BC_20180813_1_STATISTICS-402/leader-epoch-checkpoint: Too many opens
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:91)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
        at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
        at java.nio.file.Files.newByteChannel(Files.java:361)
        at java.nio.file.Files.createFile(Files.java:632)
        at kafka.server.checkpoints.CheckpointFile.<init>(CheckpointFile.scala:45)
        at kafka.server.checkpoints.LeaderEpochCheckpointFile.<init>(LeaderEpochCheckpointFile.scala:62)
        at kafka.log.Log.initializeLeaderEpochCache(Log.scala:278)
        at kafka.log.Log.<init>(Log.scala:211)
        at kafka.log.Log$.apply(Log.scala:1748)
        at kafka.log.LogManager.loadLog(LogManager.scala:265)
        at kafka.log.LogManager.$anonfun$loadLogs$12(LogManager.scala:335)
        at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:62)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)

Answer 1

在 Kafka 中，每个主题都(可选)分成许多分区。对于每个分区，一些文件由代理维护(用于索引和实际数据)。

kafka-topics --zookeeper localhost:2181 --describe --topic topic_name

将为您提供主题topic_name 的分区数。每个主题的默认分区数 num.partitions 在 /etc/kafka/server.properties

下定义

如果代理托管许多分区并且特定分区有许多日志段文件，则打开文件的总数可能会非常大。

可以通过运行查看当前的文件描述符限制

ulimit -n

您还可以使用 lsof 检查打开的文件数:

lsof | wc -l

要解决此问题，您需要更改打开文件描述符的限制:

ulimit -n <noOfFiles>

或者以某种方式减少打开文件的数量(例如，减少每个主题的分区数量)。