Bringing together the Apache Cassandra experts from the community and DataStax.
Want to learn? Have a question? Want to share your expertise? You are in the right place!
Not sure where to begin? Getting Started
Is it possible to ignore consistency level ALL when truncating a table in multi DC cluster?
For example, when a remote data-center is down and a local DC is up - we can't run data-migration script (that truncates some table) because of the remote DC. Getting this error:
Error during truncate: Cannot achieve consistency level ALL
Perhaps we are missing something in our cluster setup..
Thanks!
All nodes must be available when truncating a table because by definition, it's an immediate removal of data from the table at a point in time.
If nodes do not receive the truncation request because they are down or unresponsive, the data on these nodes do not get removed. When they rejoin the cluster or become responsive again, they will return data you thought was already deleted so it isn't possible to perform a TRUNCATE unless all nodes are available. Cheers!
@Erick Ramirez Is "TUNCATE" the only command that requires all nodes in the cluster to be available?
I didn't find other commands with similar requirement (in the documentation: https://docs.datastax.com/en/cql-oss/3.x/cql/cql_reference/cqlCommandsTOC.html)
If so we may consider replacing truncate with delete in our use-case.
That would be expensive because it requires a full table scan so will affect the performance of your cluster. Cheers!
7 People are following this question.
