The retry was aborted by Spanner and the maximum number of retry attempts allowed has been
exceeded. The transaction cannot continue and will throw an AbortedException.
RETRY_ABORTED_AND_RESTARTING
The retry was aborted by Spanner and another retry attempt will be started.
RETRY_ABORTED_DUE_TO_CONCURRENT_MODIFICATION
The retry was aborted by the java.sql.Connection because of a concurrent
modification. The transaction cannot continue and will throw an AbortedDueToConcurrentModificationException.
RETRY_ERROR
An unexpected error occurred during transaction retry, the transaction cannot continue and
will throw an exception.
RETRY_SUCCESSFUL
The retry executed successfully and the transaction will continue.