I got the following WARNs from ARM server:
13/06/10 01:31:06 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
13/06/10 01:31:06 WARN snappy.LoadSnappy: Snappy native library not loaded
But I don't get these WANRs in x86 server. Is Snappy code coming with Hadoop package but only supporting x86?
From http://code.google.com/p/snappy/source/browse/trunk/README, I see snappy codec is optimized for x86 so I am guessing it is not loaded in non x86 server in Hadoop?
Related
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
21/11/02 12:09:01 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
21/11/02 12:09:02 ERROR SparkContext: Error initializing SparkContext.
java.lang.reflect.InvocationTargetException
21/11/02 12:09:01 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
21/11/02 12:09:02 ERROR SparkContext: Error initializing SparkContext.
java.lang.reflect.InvocationTargetExceptionenter code here
I installed hadoop on my mac and tried to start it using start-dfs.sh. However, I kept getting the Warning message: WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable. Any suggestions on what files to modify?
Ms-MacBook-Pro% ./start-dfs.sh
Starting namenodes on [localhost]
Starting datanodes
localhost: datanode is running as process 48267. Stop it first.
Starting secondary namenodes [Ms-MacBook-Pro.local]
Ms-MacBook-Pro.local: secondarynamenode is running as process 48390. Stop it first.
2019-08-31 22:39:06,151 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
I am using Rancher for manage an environment , I am using Hadoop + Yarn (Experimental) for flink and zookeeper in rancher .
I am trying to configure the hdfs on the flink-conf.yaml.
This is the changes that I made in connection to Hdfs :
fs.hdfs.hadoopconf: /etc/hadoop
recovery.zookeeper.storageDir: hdfs://:8020/flink/recovery
state.backend.fs.checkpointdir: hdfs://:8020/flink/checkpoints
And I get an error that say that :
2016-09-06 14:10:44,965 WARN org.apache.hadoop.util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
What I did wrong ?
Best regards
When I run hadoop command like hadoop fs -ls, I get following error/warnings:
16/08/04 11:24:12 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
ls: Call From master/172.17.100.54 to master:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
Am I doing anything wrong with the hadoop path?
Hadoop Native Libraries Guide say its some thing to do with
installation. please check documentation to resolve this.
Native Hadoop Library
Hadoop has native implementations of certain components for performance reasons and for non-availability of Java implementations. These components are available in a single, dynamically-linked native library called the native hadoop library. On the *nix platforms the library is named libhadoop.so.
Please note the following:
It is mandatory to install both the zlib and gzip development packages on the target platform in order to build the native hadoop library; however, for deployment it is sufficient to install just one package if you wish to use only one codec.
It is necessary to have the correct 32/64 libraries for zlib, depending on the 32/64 bit jvm for the target platform, in order to build and deploy the native hadoop library.
Runtime
The bin/hadoop script ensures that the native hadoop library is on the library path via the system property: -Djava.library.path=<path>
During runtime, check the hadoop log files for your MapReduce tasks.
If everything is all right, then: DEBUG util.NativeCodeLoader - Trying to load the custom-built native-hadoop library... INFO util.NativeCodeLoader - Loaded the native-hadoop library
If something goes wrong, then: INFO util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Check
NativeLibraryChecker is a tool to check whether native libraries are loaded correctly. You can launch NativeLibraryChecker as follows
$ hadoop checknative -a
14/12/06 01:30:45 WARN bzip2.Bzip2Factory: Failed to load/initialize native-bzip2 library system-native, will use pure-Java version
14/12/06 01:30:45 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
Native library checking:
hadoop: true /home/ozawa/hadoop/lib/native/libhadoop.so.1.0.0
zlib: true /lib/x86_64-linux-gnu/libz.so.1
snappy: true /usr/lib/libsnappy.so.1
lz4: true revision:99
bzip2: false
Second thing Connection refused is something related to your setup. please double check setup.
also see the below as pointers..
Hadoop cluster setup - java.net.ConnectException: Connection refused
Hadoop - java.net.ConnectException: Connection refused
alpesh#alpesh-Inspiron-3647:~/hadoop-2.7.2/sbin$ hadoop fs -ls
16/07/05 13:59:17 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
It is also showing me the the output as below
hadoop check native -a
16/07/05 14:00:42 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Native library checking:
hadoop: false
zlib: false
snappy: false
lz4: false
bzip2: false
openssl: false
16/07/05 14:00:42 INFO util.ExitUtil: Exiting with status 1
Please help me to solve this
Library you are using is compiled for 32 bit and you are using 64 bit version. so open your .bashrc file where configuration for hadoop exists. Go to this line
export HADOOP_OPTS="-Djava.library.path=$HADOOP_INSTALL/lib"
and replace it with
export HADOOP_OPTS="-Djava.library.path=$HADOOP_INSTALL/lib/native"
To get rid of this error:
Suppose Jar file is at /home/cloudera/test.jar and class file is at /home/cloudera/workspace/MapReduce/bin/mapreduce/WordCount, where mapreduce is the package name.
Input file mytext.txt is at /user/process/mytext.txt and output file location is /user/out.
We should run this mapreduce program in following way:
$hadoop jar /home/cloudera/bigdata/text.jar mapreduce.WordCount /user/process /user/out
Add these properties in bash profile of Hadoop user, the issue will be solved
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_COMMON_LIB_NATIVE_DIR"
It's just a warning, because it can not find the correct .jar. Either by compiling it or because it does not exist.
If I were you, I would simply omit it
To do that add in the corresponding configuration file
log4j.logger.org.apache.hadoop.util.NativeCodeLoader=ERROR