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The "FAQ" page has been changed by GautamGopalakrishnan: https://wiki.apache.org/hadoop/FAQ?action=diff&rev1=113&rev2=114 == What does the message "Operation category READ/WRITE is not supported in state standby" mean? == In an HA-enabled cluster, DFS clients cannot know in advance which namenode is active at a given time. So when a client contacts a namenode and it happens to be the standby, the READ or WRITE operation will be refused and this message is logged. The client will then automatically contact the other namenode and try the operation again. As long as there is one active and one standby namenode in the cluster, this message can be safely ignored. - If an application is configured to contact only one namenode always, this message indicates that the application is failing to perform any read/write operation. In such situations, the application would need to be modified to contact the other namenode. + If an application is configured to contact only one namenode always, this message indicates that the application is failing to perform any read/write operation. In such situations, the application would need to be modified to use the HA configuration for the cluster. = Platform Specific = == General ==
