namenode Number of Under-Replicated Blocks
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代表你的hadoop hdfs已经不健康了,一般是由于副本数不匹配导致。
可以执行hdfs fsck /
找到异常的块,具体参数根据自己的副本数来定
执行hdfs dfs -setrep -R 2 path
也可以直接删除,如果你觉得这个块没有用的话!
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