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If a secondary goes down, nodes take a long time to refresh #321

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dblock opened this Issue Sep 28, 2014 · 3 comments

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@dblock @wandenberg @johnnyshields
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dblock commented Sep 28, 2014

We had a secondary go down, causing a heartbeat check failure in MongoDB and the following in the MongoDB logs:

Sun Sep 28 13:27:21.905 [rsHealthPoll] couldn't connect to c0.gravity.member4.mongolayer.com:27017: couldn't connect to server c0.gravity.member4.mongolayer.com:27017

This made our response time 5x slower, taking about 400ms to create a new Moped session. I didn't debug where exactly it was sitting, but I am going to imagine it's not too hard to replicate.

I would expect something a bit more efficient, IMO node rediscovery should not be blocking a request.
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wandenberg commented Feb 13, 2015

Hi @dblock could you check if the code on #352 fix this?
If not, let me know.
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dblock commented Feb 14, 2015

We'll try to upgrade production to moped HEAD this week.
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johnnyshields commented Feb 15, 2015

FYI I believe this is the same bug I reported on Mongoid https://github.com/mongoid/mongoid/issues/3892
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