java.lang.NoClassDefFoundError:

现象

在spark-shell中执行streaming application时，频繁出现以下错误。但是相同的代码在之前执行成功并无任务错误，集群以及spark的配置都没有任何改动

15/05/13 17:41:53 INFO scheduler.TaskSetManager: Starting task 3.0 in stage 0.0 (TID 6, slave14.cluster03, ANY, 1522 bytes)
15/05/13 17:41:53 WARN scheduler.TaskSetManager: Lost task 1.1 in stage 0.0 (TID 3, slave14.cluster03): java.lang.NoClassDefFoundError: org/apache/kafka/common/message/KafkaLZ4BlockOutputStream
    at kafka.message.ByteBufferMessageSet$.decompress(ByteBufferMessageSet.scala:65)
    at kafka.message.ByteBufferMessageSet$$anon$1.makeNextOuter(ByteBufferMessageSet.scala:179)
    at kafka.message.ByteBufferMessageSet$$anon$1.makeNext(ByteBufferMessageSet.scala:192)
    at kafka.message.ByteBufferMessageSet$$anon$1.makeNext(ByteBufferMessageSet.scala:146)
    at kafka.utils.IteratorTemplate.maybeComputeNext(IteratorTemplate.scala:66)
    at kafka.utils.IteratorTemplate.hasNext(IteratorTemplate.scala:58)
    at scala.collection.Iterator$$anon$1.hasNext(Iterator.scala:847)
    at scala.collection.Iterator$$anon$19.skip(Iterator.scala:612)
    at scala.collection.Iterator$$anon$19.hasNext(Iterator.scala:615)
    at org.apache.spark.streaming.kafka.KafkaRDD$KafkaRDDIterator.getNext(KafkaRDD.scala:164)
    at org.apache.spark.util.NextIterator.hasNext(NextIterator.scala:71)
    at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)
    at scala.collection.Iterator$$anon$14.hasNext(Iterator.scala:388)
    at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)
    at org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:202)
    at org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:56)
    at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68)
    at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
    at org.apache.spark.scheduler.Task.run(Task.scala:64)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:203)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.ClassNotFoundException: org.apache.kafka.common.message.KafkaLZ4BlockOutputStream
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 23 more

原因：

这个错误在google、spark mail list中都没有找到有帮助的信息。后来想到是否是因为集群资源不足导致task会各种失败，检查集群情况，集群资源使用率为100%，之后在集群空闲时执行相同的streaming application，并未出现任何错误

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