MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
These thread states occur on a replica server but are associated with connection threads, not with the I/O or SQL threads.
The thread is processing a CHANGE
MASTER TO
statement.
The thread is processing a STOP SLAVE
statement.
This state occurs after Creating table from master
dump
.
Reading master dump table data
This state occurs after Opening master dump
table
.
Rebuilding the index on master dump table
This state occurs after Reading master dump table
data
.