You can issue administrative queries to the MDEX Engine concurrently with running updates, without any interruptions caused by partial updates processing, except for the following administrative and configuration queries that are processed differently.
admin?op=exit and
admin?op=restart queries cause the MDEX Engine to close
its Dgraph port for accepting future queries. Next, the MDEX Engine processes
all previously received queries and shuts down (or restarts, depending on which
of these two commands is issued).
The
admin?op=updateaspell operation causes the MDEX Engine
to finish processing all existing preceding queries, temporarily stop
processing other queries and begin to process
admin?op=updateaspell. After it finishes processing this
operation, the MDEX Engine resumes processing queries that queued up
temporarily behind this request. Only one
admin?op=updateaspell operation can be processed at a
time.
config?op=update and
admin?op=reload-services operations cause the MDEX
Engine to drain all existing preceding queries, temporarily stop processing
other queries and begin to process
config?op=update and
admin?op=reload-services. After it finishes processing
these operations, the MDEX Engine resumes processing queries that queued up
temporarily behind these requests.
Only one
config?op=update operation can be processed at a time.
Note
config?op=update and
admin?op=reload-services can be time-consuming
operations. This depends on the number of configuration files the MDEX Engine
has to process for an update (during
config?op=update), or the number of XQuery modules
that you have created and that have to be compiled (during
admin?op=reload-services).
Processing time for the
admin?op=updateaspell administrative query can be
higher compared with the time it takes the MDEX Engine to process partial
updates. Processing time depends on the scope of updates to the spelling
dictionary sent to the MDEX Engine with this operation.
You can issue all other administrative queries to the MDEX Engine concurrently with updates, without any interruptions caused by partial updates processing.
