Personal experience, we updated to 3.2 first, then to WiredTiger. The 3.0
to 3.2 upgrade was done in-place, i.e., on the same servers, then the WT
conversion was done as a rolling upgrade to new servers. It went fine.
The things I'd recommend looking at closely pre-flight are (a) ensure
you've got enough replication log window to support a rolling upgrade and
(b) closely monitor the I/O after the first secondary is replicated -- in
our case, we found the journal on WT to be much more write-intensive than
MMAP. If you're using the Mongo hosted backup, be sure to convert your
format there to WT when done. Overall, other than the time required, it
was a non-event for us.
On Monday, April 18, 2016 at 6:05:39 AM UTC-7, Daniel Galinkin wrote:
As explained in the subject, we currently use MongoDB 3.0 with MMAP
storage, and would like to upgrade to 3.2 WiredTiger.
What would be the best course of action?
- First upgrade the storage to wired tiger, and then upgrade the mongo
- upgrade the mongo version first, maintaining the storage engine, and
then upgrade it to wired tiger?
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