Explain Tombstone in Cassandra?
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A delete does nothing more than insert a tombstone. When Cassandra reads the data it will merge all the shards of the requested rows from the memtable and the SSTables. It then applies a Last Write Wins (LWW) algorithm to choose what is the correct data, no matter if it is a standard value or atombstone.
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A delete does nothing more than insert a tombstone. When Cassandra reads the data it will merge all the shards of the requested rows from the memtable and the SSTables. It then applies a Last Write Wins (LWW) algorithm to choose what is the correct data, no matter if it is a standard value or atombstone.
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In Cassandra, deleted data is not immediately purged from the disk. Instead, Cassandra writes a special value, known as a tombstone, to indicate that data has been deleted. Tombstones prevent deleted data from being returned during reads, and will eventually allow the data to be dropped via compaction.
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