(编辑:jimmy 日期: 2024/12/23 浏览:2)
问题描述:
启动Azkaban报错:
java.lang.NoSuchMethodError:com.google.common.collect.ImmutableMap.toImmutableMap
解决方法:
从报错信息来看,是找不到toImmutableMap这个方法。首先找到类ImmutableMap对应的Jar包为guava,然后在服务器查找这个Jar包:
find / -name "guava*.jar"
发现除了Azkaban安装目录,其他程序目录下也有guava包。Azkaban里面的guava包版本为guava-21.0.jar,其他程序的版本有11,14,17,18,19,21,25,怀疑是由于有多个guava包,而使用的是低版本的包,里面没有toImmutableMap方法。
接下来,看看azkaban运行时候的classpath是什么样的。查看Web Server启动文件start-web.sh
:
more /u01/app/azkaban-3.50.0/azkaban-web-server-0.1.0-SNAPSHOT/bin/start-web.sh
内容为:
#!/bin/bash script_dir=$(dirname $0) ${script_dir}/internal/internal-start-web.sh >webServerLog_`date +%F+%T`.out 2>&1 &
调用的是internal-start-web.sh,于是再查看:
more /u01/app/azkaban-3.50.0/azkaban-web-server-0.1.0-SNAPSHOT/bin/internal/internal-start-web.sh
内容为:
#!/bin/bash azkaban_dir=$(dirname $0)/../.. # Specifies location of azkaban.properties, log4j.properties files # Change if necessary conf=$azkaban_dir/conf if [[ -z "$tmpdir" ]]; then tmpdir=/tmp fi for file in $azkaban_dir/lib/*.jar; do CLASSPATH=$CLASSPATH:$file done for file in $azkaban_dir/extlib/*.jar; do CLASSPATH=$CLASSPATH:$file done for file in $azkaban_dir/plugins/*/*.jar; do CLASSPATH=$CLASSPATH:$file done if [ "$HADOOP_HOME" != "" ]; then echo "Using Hadoop from $HADOOP_HOME" CLASSPATH=$CLASSPATH:$HADOOP_HOME/conf:$HADOOP_HOME/* JAVA_LIB_PATH="-Djava.library.path=$HADOOP_HOME/lib/native/Linux-amd64-64" else echo "Error: HADOOP_HOME is not set. Hadoop job types will not run properly." fi if [ "$HIVE_HOME" != "" ]; then echo "Using Hive from $HIVE_HOME" CLASSPATH=$CLASSPATH:$HIVE_HOME/conf:$HIVE_HOME/lib/* fi echo $azkaban_dir; echo $CLASSPATH; executorport=`cat $conf/azkaban.properties | grep executor.port | cut -d = -f 2` serverpath=`pwd` if [[ -z "$AZKABAN_OPTS" ]]; then AZKABAN_OPTS="-Xmx4G" fi # Set the log4j configuration file if [ -f $conf/log4j.properties ]; then AZKABAN_OPTS="$AZKABAN_OPTS -Dlog4j.configuration=file:$conf/log4j.properties -Dlog4j.log.dir=$azkaban_dir/logs" else echo "Exit with error: $conf/log4j.properties file doesn't exist." exit 1; fi AZKABAN_OPTS="$AZKABAN_OPTS -server -Dcom.sun.management.jmxremote -Djava.io.tmpdir=$tmpdir -Dexecutorport=$executorport -Dserverpat h=$serverpath" java $AZKABAN_OPTS $JAVA_LIB_PATH -cp $CLASSPATH azkaban.webapp.AzkabanWebServer -conf $conf $@ & echo $! > $azkaban_dir/currentpid
可以看到,Azkaban安装目录的jar包是在原$CLASSPATH之后的,如下:
for file in $azkaban_dir/lib/*.jar; do CLASSPATH=$CLASSPATH:$file done
这样,其他目录下的guava包就会被先找到使用。好了,问题原因找到了,解决方法就很简单了,将CLASSPATH=$CLASSPATH:$file
改为CLASSPATH=$file:$CLASSPATH
,让Azkaban安装目录下的guava包先被找到使用。另外,Executor Server的启动文件/u01/app/azkaban-3.50.0/azkaban-exec-server-0.1.0-SNAPSHOT/bin/internal/internal-start-executor.sh也需要做同样修改。
修改完成后,再启动服务就正常了。(Executor Server和Web Server都需要重新启动)
完毕。