we operate for our customer a server with a single mongo instance, gradle, postgres and nginx running on it. The problem is we had massiv performance problmes until mongodump is running. The mongo queue is growing and no data be queried. The next problem is the costumer want not invest in a replica-set or a software update (mongod 3.x).
Has somebody any idea how i clould improve the performance.
command to create the dump:
mongodump -u ${MONGO_USER} -p ${MONGO_PASSWORD} -o ${MONGO_DUMP_DIR} -d ${MONGO_DATABASE} --authenticationDatabase ${MONGO_DATABASE} > /backup/logs/mongobackup.log
tar cjf ${ZIPPED_FILENAME} ${MONGO_DUMP_DIR}
System: 6 Cores 36 GB RAM 1TB SATA HDD + 2TB (backup NAS)
MongoDB 2.6.7
Thanks
Best regards, Markus
As you have heavy load, adding a replica set is a good solution, as backup could be taken on secondary node, but be aware that replica need at least three servers (you can have an master/slave/arbiter - where the last need a little amount of resources)
MongoDump makes general query lock which will have an impact if there is a lot of writes in dumped database.
Hint: try to make backup when there is light load on system.