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    Server timeout during read query at consistency LOCAL_ONE

    There are several possible issues.

    • It may be a problem with a large amount of tombstones in cassandra. In this case we would suggest to either increase ‘tombstone_failure_threshold’ in cassandra.yaml or clean up tombstones.
    • There are not enough alive replicas. We would propose to increase the replication factor.
    • In some cases there is not enough request timeout. We are proposing to try to increase ‘read_request_timeout_in_ms’ in cassandra.yaml, if it is possible.