Cassandra~
1. Cassandra replaces the value to be deleted with a special value called a tombstone in case of other nodes are down so that they can't receive the deletion request.
2. delete the tombstone after GCGraceSeconds. So, a node is down for a longer than GCGraceSeconds can't get tombstone updates propagation. You need to remove the node.
http://wiki.apache.org/cassandra/DistributedDeletes
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