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bio website comerford.cc
location Ireland
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visits member for 2 years, 3 months
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I currently work for MongoDB, Inc. and have a background in operations, networking and system administration. You can find me in all the usual places, but probably the most useful and relevant are listed below:

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Feb
14
answered How much of hardware resource is required for Graylog2?
Feb
4
awarded  Popular Question
Jan
25
comment MongoDB replicaSet failover incurs 1000x query response time increase
There are no slow queries being logged in the database in the second log output besides a getmore on the oplog (which is replication). That would suggest that the delay is on the PHP side rather than the DB, but you would need to add some debug to figure out where. Couple of quick checks - what happens if you just shut down the secondary rather than firewalling off and/or what if you actively reject (RST) rather than DROP - does the behavior change? I'm wondering if the detection of the new layout taking a long time might be an issue - failing more quickly would be a way to find out
Jan
24
awarded  Yearling
Jan
18
revised Quickest/best way to copy a portion of a large mongo database to another server?
added note about indexes
Jan
18
answered Quickest/best way to copy a portion of a large mongo database to another server?
Jan
17
answered MongoDB server crashed, showing the following error
Jan
17
answered MongoDB Disaster Prep on AWS
Jan
14
answered starting mongodb outside of path
Jan
10
answered Mongos connecting to replica set
Jan
4
revised Does a MongoDB replica set require at least 2 or 3 members?
embedded link is far cleaner
Jan
4
revised Does a MongoDB replica set require at least 2 or 3 members?
updated status of pull request
Jan
4
answered Does a MongoDB replica set require at least 2 or 3 members?
Dec
20
revised MongoDB and datasets that don't fit in RAM no matter how hard you shove
blocks is the wrong term to use, sectors is better, fixed
Dec
20
awarded  Tenacious
Dec
19
revised mongoexport csv output array values
typo in example details
Dec
19
answered mongoexport csv output array values
Dec
12
comment MongoDB Replica-Set with Replication Lag on one node only
On point 3, basically you can get false positives in terms of lag if you don't have operations replicating all the time (no updated optime on the secondary). For there to be an accurate lag calculation, there has to be a constant stream of ops - this is why the MMS lag graph has a bunch of logic to eliminate this kind of event. It's tough to diagnose this, but you could do a simple test by doing a low level of inserts (1 per 5 seconds say) to a test collection, thereby guaranteeing a constant flow.
Dec
11
answered MongoDB Replica-Set with Replication Lag on one node only
Dec
11
answered Amazon EC2 High-Memory Extra Large Instance