做惠而浦售后网站赚钱,软件接口设计文档,创建私人网站,seo外链测试环境的hive cli启动时报错#xff1a;Unable to determine Hadoop version information.hive是一个shell:使用sh -x跟踪运行过程#xff0c;可以看到其通过hadoop version获取hdfs的版本相关的代码如下#xff1a;# Make sure were using a compatible version of Hadoo… 测试环境的hive cli启动时报错Unable to determine Hadoop version information.hive是一个shell:使用sh -x跟踪运行过程可以看到其通过hadoop version获取hdfs的版本相关的代码如下# Make sure were using a compatible version of Hadoop
if [ x$HADOOP_VERSION x ]; thenHADOOP_VERSION$($HADOOP version | awk {if (NR 1) {print $2;}});
fi
echo hadoop_version is $HADOOP_VERSION
# Save the regex to a var to workaround quoting incompatabilities
# between Bash 3.1 and 3.2
hadoop_version_re^([[:digit:]])\.([[:digit:]])(\.([[:digit:]]))?.*$
if [[ $HADOOP_VERSION ~ $hadoop_version_re ]]; thenhadoop_major_ver${BASH_REMATCH[1]}hadoop_minor_ver${BASH_REMATCH[2]}hadoop_patch_ver${BASH_REMATCH[4]}
elseecho Unable to determine Hadoop version information.echo hadoop version returned:echo $HADOOP versionexit 5
fi
if [ $hadoop_major_ver -lt 1 -a $hadoop_minor_ver$hadoop_patch_ver -lt 201 ]; thenecho Hive requires Hadoop 0.20.x (x 1).echo hadoop version returned:echo $HADOOP versionexit 6
fi先使用hadoop version | awk {if (NR 1) {print $2;}}来获取version输出地第一行然后用到了3.x shell中的正则功能。,最后通过BASH_REMATCH数组来判断匹配组,hadoop 也是一个shell 运行hadoop version时其实是调用了org.apache.hadoop.util.VersionInfo类而这里由于之前debug hadoop的变量问题更改了hadoop的脚本导致其第一行并没有输出version的信息。这里其实使用hadoop version的第一行输出严格来说不太好最好使用正则来处理更改如下if [ x$HADOOP_VERSION x ]; then#HADOOP_VERSION$($HADOOP version | awk {if (NR 1) {print $2;}});HADOOP_VERSION$($HADOOP version | awk {if($0 ~ /[[:alpha:]] ([[:digit:]])\.([[:digit:]])\.([[:digit:]])?.*$/){print $2};});
fi 转载于:https://blog.51cto.com/caiguangguang/1579829
