i have 4 nodes in cluster. when take snapshots whether checks latest data cluster or take node data alone. question is, snapshots provides latest data or not?
if provides latest data no need take snapshot on each , every node in cluster right?
snapshots flush memtables disc (i.e. makes sstables) latest node data present in snapshot. command works @ node level, meaning latest data each node, not every node @ once.
the advice given on datastax docs if want data @ same time, should use command-line utility can execute requests in parallel (pssh suggested util).
if provides latest data no need take snapshot on each , every node in cluster right?
i cant see case need backup data daily when you're using cassandra unless running single node environment (which c* seems pointless). if have high enough replication factor, data backed up, , unless expecting catastrophic hardware failures servers (aka entire cluster) simultaneously burst fire, not need backup daily.
Comments
Post a Comment