[HDFS-12113] `hadoop fs -setrep` requries huge amount of memory on client side

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.6.0, 2.6.5

Environment

Java 7

• Assignee: Unassigned
• Reporter: Ruslan Dautkhanov
• Created: 10/Jul/17 20:16
• Updated: 23/Aug/17 20:51
• Resolved: 23/Aug/17 20:51

Description

$ hadoop fs -setrep -w 3 /

was failing with

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.StringBuilder.append(StringBuilder.java:132)
at org.apache.hadoop.fs.shell.PathData.getStringForChildPath(PathData.java:305)
at org.apache.hadoop.fs.shell.PathData.getDirectoryContents(PathData.java:272)
at org.apache.hadoop.fs.shell.Command.recursePath(Command.java:373)
at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:319)
at org.apache.hadoop.fs.shell.Command.recursePath(Command.java:373)
at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:319)
at org.apache.hadoop.fs.shell.Command.recursePath(Command.java:373)
at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:319)
at org.apache.hadoop.fs.shell.Command.recursePath(Command.java:373)
at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:319)
at org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:289)
at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:271)
at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:255)
at org.apache.hadoop.fs.shell.SetReplication.processArguments(SetReplication.java:76)
at org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:118)
at org.apache.hadoop.fs.shell.Command.run(Command.java:165)
at org.apache.hadoop.fs.FsShell.run(FsShell.java:315)
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:372)

Until hadoop fs cli command's Java heap memory was allowed to grow to 5Gb:

HADOOP_HEAPSIZE=5000 hadoop fs -setrep -w 3 /

Notice that this setrep change was done for whole HDFS filesystem.

So looks like there is a dependency on amount of memory used by `hadoop fs -setrep` command on how many files total HDFS has? This is not a huge HDFS filesystem, I would say even "small" by current standards.

Issue Links

• duplicates: HADOOP-12502 SetReplication OutOfMemoryError