Reading error in cassandra

Question

I\'m having a weir error trying to read data from a Cassandra table. I have a single-node installation, with the default setup. This is the query I\'m making:

Answer 1

You are exceeding the tombstone_failure_threshold. It defaults to 100'000. You can either

• increase the value in the cassandra.yaml or
• clean up your tombstones

To do the latter alter your table and set the gc_grace_seconds to 0:

ALTER TABLE component_readings WITH GC_GRACE_SECONDS = 0;

Then trigger a compaction via the nodetool. This will flush out all tombstones.

In your particular scenario of a one-node-cluster you could leave the GC_GRACE_SECONDS at zero. But if you do, keep in mind to undo this if you ever want to use more than one node!