本文介绍了Hadoop copyFromLocal的内存不足问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试将包含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:
I'm trying to copy a directory that contains 1,048,578 files into hdfs file system but, got below error:
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)
推荐答案
问题基本上与Hadoop客户端有关.通过将"GCOverheadLimit"增加到4GB，可以解决此问题.以下命令解决了我的问题.
Issue was basically with Hadoop client. This is fixed by increasing "GCOverheadLimit" to 4GB. Following command solved my problem.
export HADOOP_CLIENT_OPTS =-XX:-UseGCOverheadLimit -Xmx4096m"
export HADOOP_CLIENT_OPTS="-XX:-UseGCOverheadLimit -Xmx4096m"
这篇关于Hadoop copyFromLocal的内存不足问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！