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8.14.5 Replication Slave SQL Thread States
The following list shows the most common states you may see in
the State
column for a slave server SQL
thread:
The thread is processing a
STOP SLAVE
statement.Making temporary file (append) before replaying LOAD DATA INFILE
The thread is executing a
LOAD DATA
statement and is appending the data to a temporary file containing the data from which the slave will read rows.Making temporary file (create) before replaying LOAD DATA INFILE
The thread is executing a
LOAD DATA
statement and is creating a temporary file containing the data from which the slave will read rows. This state can only be encountered if the originalLOAD DATA
statement was logged by a master running a version of MySQL lower than MySQL 5.0.3.Reading event from the relay log
The thread has read an event from the relay log so that the event can be processed.
Slave has read all relay log; waiting for more updates
The thread has processed all events in the relay log files, and is now waiting for the I/O thread to write new events to the relay log.
Waiting for an event from Coordinator
Using the multithreaded slave (
slave_parallel_workers
is greater than 1), one of the slave worker threads is waiting for an event from the coordinator thread.Waiting for slave mutex on exit
A very brief state that occurs as the thread is stopping.
Waiting for Slave Workers to free pending events
This waiting action occurs when the total size of events being processed by Workers exceeds the size of the
slave_pending_jobs_size_max
system variable. The Coordinator resumes scheduling when the size drops below this limit. This state occurs only whenslave_parallel_workers
is set greater than 0.Waiting for the next event in relay log
The initial state before
Reading event from the relay log
.Waiting until MASTER_DELAY seconds after master executed event
The SQL thread has read an event but is waiting for the slave delay to lapse. This delay is set with the
MASTER_DELAY
option ofCHANGE MASTER TO
.
The Info
column for the SQL thread may also
show the text of a statement. This indicates that the thread has
read an event from the relay log, extracted the statement from
it, and may be executing it.
Document created the 26/06/2006, last modified the 26/10/2018
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