hive cli启动判断hadoop version的问题
时间:2014-12-02 15:33来源:linux.it.net.cn 作者:IT网
测试环境的hive cli启动时报错:
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Unable to determine Hadoop version information.
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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:
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# Make sure we're using a compatible version of Hadoop
if [ "x$HADOOP_VERSION" == "x" ]; then
HADOOP_VERSION=$($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" =~ $hadoop_version_re ]]; then
hadoop_major_ver=${BASH_REMATCH[1]}
hadoop_minor_ver=${BASH_REMATCH[2]}
hadoop_patch_ver=${BASH_REMATCH[4]}
else
echo "Unable to determine Hadoop version information."
echo "'hadoop version' returned:"
echo `$HADOOP version`
exit 5
fi
if [ "$hadoop_major_ver" -lt "1" -a "$hadoop_minor_ver$hadoop_patch_ver" -lt "201" ]; then
echo "Hive requires Hadoop 0.20.x (x >= 1)."
echo "'hadoop version' returned:"
echo `$HADOOP version`
exit 6
fi
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先使用
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hadoop version | awk '{if (NR == 1) {print $2;}}'
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来获取version输出地第一行,然后用到了3.x shell中的正则功能。,最后通过BASH_REMATCH数组来判断匹配组,hadoop 也是一个shell ,运行hadoop version时其实是调用了org.apache.hadoop.util.VersionInfo类
而这里由于之前debug hadoop的变量问题,更改了hadoop的脚本,导致其第一行并没有输出version的信息。
这里其实使用hadoop version的第一行输出严格来说不太好,最好使用正则来处理,更改如下:
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if [ "x$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 |
(责任编辑:IT) |
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