[HADOOP-14418] Confusing failure stack trace when codec fallback is happend

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Labels: hdfs-ec-3.0-nice-to-have
• Assignee: Kai
• Reporter: Kai
• Created: 13/May/17 08:27
• Updated: 07/Aug/17 23:50
• Resolved: 07/Aug/17 23:50

Description

When erasure codec is fallbacked, all stacktrace is shown to client.

root@990705591ccc:/usr/local/hadoop# bin/hadoop fs -put README.txt /ec
17/05/13 08:23:46 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
17/05/13 08:23:47 WARN erasurecode.CodecUtil: Failed to create raw erasure encoder rs_native, fallback to next codec if possible
java.lang.ExceptionInInitializerError
	at org.apache.hadoop.io.erasurecode.rawcoder.NativeRSRawErasureCoderFactory.createEncoder(NativeRSRawErasureCoderFactory.java:35)
	at org.apache.hadoop.io.erasurecode.CodecUtil.createRawEncoderWithFallback(CodecUtil.java:173)
	at org.apache.hadoop.io.erasurecode.CodecUtil.createRawEncoder(CodecUtil.java:129)
	at org.apache.hadoop.hdfs.DFSStripedOutputStream.<init>(DFSStripedOutputStream.java:302)
	at org.apache.hadoop.hdfs.DFSOutputStream.newStreamForCreate(DFSOutputStream.java:309)
	at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1214)
	at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1193)
	at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1131)
	at org.apache.hadoop.hdfs.DistributedFileSystem$8.doCall(DistributedFileSystem.java:449)
	at org.apache.hadoop.hdfs.DistributedFileSystem$8.doCall(DistributedFileSystem.java:446)
	at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
	at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:460)
	at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:387)
	at org.apache.hadoop.fs.FilterFileSystem.create(FilterFileSystem.java:181)
	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:1074)
	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:1054)
	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:943)
	at org.apache.hadoop.fs.shell.CommandWithDestination$TargetFileSystem.create(CommandWithDestination.java:509)
	at org.apache.hadoop.fs.shell.CommandWithDestination$TargetFileSystem.writeStreamToFile(CommandWithDestination.java:484)
	at org.apache.hadoop.fs.shell.CommandWithDestination.copyStreamToTarget(CommandWithDestination.java:407)
	at org.apache.hadoop.fs.shell.CommandWithDestination.copyFileToTarget(CommandWithDestination.java:342)
	at org.apache.hadoop.fs.shell.CommandWithDestination.processPath(CommandWithDestination.java:277)
	at org.apache.hadoop.fs.shell.CommandWithDestination.processPath(CommandWithDestination.java:262)
	at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:331)
	at org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:303)
	at org.apache.hadoop.fs.shell.CommandWithDestination.processPathArgument(CommandWithDestination.java:257)
	at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:285)
	at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:269)
	at org.apache.hadoop.fs.shell.CommandWithDestination.processArguments(CommandWithDestination.java:228)
	at org.apache.hadoop.fs.shell.CopyCommands$Put.processArguments(CopyCommands.java:286)
	at org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:119)
	at org.apache.hadoop.fs.shell.Command.run(Command.java:176)
	at org.apache.hadoop.fs.FsShell.run(FsShell.java:326)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
	at org.apache.hadoop.fs.FsShell.main(FsShell.java:389)
Caused by: java.lang.RuntimeException: hadoop native library cannot be loaded.
	at org.apache.hadoop.io.erasurecode.ErasureCodeNative.checkNativeCodeLoaded(ErasureCodeNative.java:69)
	at org.apache.hadoop.io.erasurecode.rawcoder.NativeRSRawEncoder.<clinit>(NativeRSRawEncoder.java:33)
	... 36 more
root@990705591ccc:/usr/local/hadoop#

This message is confusing to users because it looks like writing ec file is failed. It is useful to print only error message.

        LOG.warn("Failed to create raw erasure encoder " + rawCoderName +
            ", fallback to next codec if possible", e);

Issue Links

• duplicates: HDFS-12094 Log torrent when none isa-l EC is used.