What's New in Apache Impala

Query Transparent Retries for Some Transient Errors

If a SELECTquery fails due to a cluster membership change, the Coordinator will cancel and unregister the running query and then launch a retry of the query. For e.g., if one of the executor nodes fails during query execution, the query fails but is transparently re-executed, either with the executor node immediately replaced, or with a temporarily reduced number of executor nodes. This feature will support retrying the entire query and NOT the individual query fragments. INSERT and DDL queries will NOT be retried.

For details, see Retry Failed Queries.