Hi Jean Paul,
Yes, the gossiper is used. Example with down nodes:1. The status command
retrieve unreachable nodes from a NodeProbe instance:
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/tools/nodetool/Status.java#L64
2. The NodeProbe list comes from a StorageService proxy:
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/tools/NodeProbe.java#L4383.
The proxy calls the Gossiper singleton:
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/service/StorageService.java#L2681
Best,
Romain
Le Jeudi 11 août 2016 14h16, jean paul <researche...@gmail.com> a écrit :
Hi all,
$nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/ Moving
-- Address Load Tokens Owns (effective) Host ID
Rack
UN 127.0.0.1 83.05 KB 256 100.0% 460ddcd9-1ee8-48b8-a618-
c076056aad07 rack1
The nodetool command shows the status of the node (UN=up,DN=down):
Please i'd like to know how this command works and is it based on gossip
protocol or not ?
Thank you so much for explanations.Best regards.
