Thank you guys, I resolved it. There is a VERSION file under each data directory, in my case: /hadoop/hdfs/data2/current/VERSION /hadoop/hdfs/data/current/VERSION in this file, there is a layoutVersion property. I checked this property for data2 and data directories and it was not the same. Since I didn't have any data under data2, I remove the content of data2, restart the hdfs and it works.
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