Some initialization of local checkpoint variables takes place in this phase, and for initial restarts, this is all that happens in this phase.
For system restarts, all required takeovers are also performed. Currently, this means that all nodes whose states could not be recovered using the redo log are restarted by copying to them all the necessary data from the “live” data nodes.
For node restarts and initial node restarts, the master node
performs a number of services, requested to do so by sending the
START_MEREQ signal to it. This phase is
complete when the master responds with a
START_MECONF message, and is described in
Section 5.22, “START_MEREQ Handling”.
After ensuring that the tasks assigned to
DBDIH tasks in the NDB_STTOR phase 4 are
NDBCNTR performs some work on its
own. For initial starts, it creates the system table that keeps
track of unique identifiers such as those used for
AUTO_INCREMENT. Following the WAITPOINT_4_1
synchronization point, all system restarts proceed immediately
NDB_STTOR phase 5, which is handled by the
DBDIH block. See
Section 5.13, “NDB_STTOR Phase 5”, for