CLUSTER COUNT-FAILURE-REPORTS node-id
The command returns the number of failure reports for the specified node. Failure reports are the way Redis Cluster uses in order to promote a
PFAIL state, that means a node is not reachable, to a
FAIL state, that means that the majority of masters in the cluster agreed within a window of time that the node is not reachable.
A few more details:
PFAILwhen the node is not reachable for a time greater than the configured node timeout, which is a fundamental configuration parameter of a Redis Cluster.
PFAILstate are provided in gossip sections of heartbeat packets.
PFAIL, and at the same time collected the majority of other master nodes failure reports about this node (including itself if it is a master), then it elevates the failure state of the node from
FAIL, and broadcasts a message forcing all the nodes that can be reached to flag the node as
This command returns the number of failure reports for the current node which are currently not expired (so received within two times the node timeout time). The count does not include what the node we are asking this count believes about the node ID we pass as argument, the count only includes the failure reports the node received from other nodes.
This command is mainly useful for debugging, when the failure detector of Redis Cluster is not operating as we believe it should.
Integer reply: the number of active failure reports for the node.
© 2009–2017 Salvatore Sanfilippo
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