【转】Linux中多线程wait使用注意

hdfs dfs -rmr $cdns_hadoop_base_dir/dt=$ydate
hdfs dfs -mkdir $cdns_hadoop_base_dir/dt=$ydate
cat nodeList| while read nodename 
do
    hdfs dfs -mkdir $cdns_hadoop_base_dir/dt=$ydate/node=$nodename
    ls *$nodename*lzo > cdnsFileListLzo
    while read query_log
    do
    (    hdfs dfs -put $query_log $cdns_hadoop_base_dir/dt=$ydate/node=$nodename
        rm $query_log -rf
        yarn jar ${hadooplzojar} ${hadooplzoclass} $cdns_hadoop_base_dir/dt=$ydate/node=$nodename/$query_log ) &
    done < cdnsFileListLzo
wait
done