网站介绍:文章浏览阅读10w+次,点赞32次,收藏127次。问题1: Operation category READ is not supported in state standby初步判断是由于HA节点中处于standby状态造成的异常 原因: 原来nn1机器是active,nn2是standby, 现在nn1变成了standby。 (1)在hadoop2.0中通常由两个NameNode组成,一个处于active状态,另一个处于standby状态。Active NameNode对外提供服务,而Standby NameNode则_operation category read is not supported in state standby
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