Question

我试图将包含1,048,578个文件的目录复制到hdfs文件系统中，但是出现以下错误：

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2367)
    at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130)
    at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114)
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415)
    at java.lang.StringBuffer.append(StringBuffer.java:237)
    at java.net.URI.appendSchemeSpecificPart(URI.java:1892)
    at java.net.URI.toString(URI.java:1922)
    at java.net.URI.<init>(URI.java:749)
    at org.apache.hadoop.fs.shell.PathData.stringToUri(PathData.java:565)
    at org.apache.hadoop.fs.shell.PathData.<init>(PathData.java:151)
    at org.apache.hadoop.fs.shell.PathData.getDirectoryContents(PathData.java:273)
    at org.apache.hadoop.fs.shell.Command.recursePath(Command.java:347)
    at org.apache.hadoop.fs.shell.CommandWithDestination.recursePath(CommandWithDestination.java:291)
    at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:308)
    at org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:278)
    at org.apache.hadoop.fs.shell.CommandWithDestination.processPathArgument(CommandWithDestination.java:243)
    at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:260)
    at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:244)
    at org.apache.hadoop.fs.shell.CommandWithDestination.processArguments(CommandWithDestination.java:220)
    at org.apache.hadoop.fs.shell.CopyCommands$Put.processArguments(CopyCommands.java:267)
    at org.apache.hadoop.fs.shell.Command.processRawArguments(Command.java:190)
    at org.apache.hadoop.fs.shell.Command.run(Command.java:154)
    at org.apache.hadoop.fs.FsShell.run(FsShell.java:287)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
    at org.apache.hadoop.fs.FsShell.main(FsShell.java:340)

Answer 1

问题基本上与Hadoop客户端有关。通过将“GCOverheadLimit”增加到4GB来解决此问题。以下命令解决了我的问题。

export HADOOP_CLIENT_OPTS =“ - XX：-UseGCOverheadLimit -Xmx4096m”

Answer 2

尝试给你的put（或从本地复制）命令更多的堆空间。或者，做一个不那么激进的放置操作。

即。分批复制总数据的一半或1/4或1/5 .... 所有这些复制都是使用默认的java命令从本地机器完成的，你只是重载它。

Hadoop copyFromLocal的内存不足问题

2 个答案: