java.lang.OutOfMemoryError: 遇到無法創建新的本機線程

Question

我正在使用線程池來做一些工作。 我的池大小只有 8。但我收到以下錯誤：

java.util.concurrent.ExecutionException: java.lang.OutOfMemoryError: unable to create new native thread
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
    at java.util.concurrent.FutureTask.get(FutureTask.java:83)
    at com.TransferFiles.transferFilesToHadoop(TransferFiles.java:88)
    at com.TransferJob.execute(TransferJob.java:25)
    at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
Caused by: java.lang.OutOfMemoryError: unable to create new native thread
    at java.lang.Thread.start0(Native Method)
    at java.lang.Thread.start(Thread.java:640)
    at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:555)
    at org.apache.hadoop.ipc.Client$Connection.access$1800(Client.java:184)
    at org.apache.hadoop.ipc.Client.getConnection(Client.java:1140)
    at org.apache.hadoop.ipc.Client.call(Client.java:986)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
    at $Proxy1.getFileInfo(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
    at $Proxy1.getFileInfo(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:676)
    at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:521)
    at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:692)
    at org.apache.hadoop.fs.FileUtil.checkDest(FileUtil.java:349)
    at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:205)
    at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:1119)
    at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:1095)
    at com.FileCopyRoutine.call(TransferFiles.java:325)
    at com.FileCopyRoutine.call(TransferFiles.java:257)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

我正在使用：

private static final ExecutorService exec = Executors.newFixedThreadPool(TransferToHadoopUtilities.numOfThreads);

線程數=8

Future<Boolean> futureTask =  exec.submit(new FileCopyRoutine(srcSubResultPath, destSubResultPath,execId));

FileCopyRoutine 實現了 Callable。 我可能會同時提交數百個。 任何人都可以給我一些有關此錯誤的提示嗎？

Answer 1

無法創建線程表示本機內存 - 不是堆。 如果您使用的是 32 位系統，將 -Xmx 設置得太高實際上會使本機內存不足