Hi guys! when I start a cluster,use jps check the process , find only three process namenode,datanode,and jps，but other tow datanode don't start，when I check the datanode logs ,find the ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Cannot lock storage /usr/hadoop/hadoop-data. The directory is already locked. How can I slove this probleam,Thans!
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