I have a cassandra cluster with less delete use case. I found in my system.log "Read 10 live and 5645464 tombstones cells in keyspace.table" What does it mean? please help to understand.
Thanks.
One more important thing to keep in mind when working with Cassandra is that tombstones cells do not directly correlate to deletes.
When you insert null value to an attribute when performing your insert, Cassandra internally marks that attribute/cell as a tombstone. So, even if you don't have a lot of deletes happening, you could end up with an enormous number of tombstones. Easy and simple solution is to not insert null values for an attribute while inserting.
As per this statement Read 10 live and 5645464 tombstones cells in keyspace.table goes, there might be a table scan for a query happening that is scanning 10 cells and 5645464 number of tombstones (cells with null value) while doing so is what I am guessing. Need to understand what type of queries are being executed to gain more insight into that.