[mongodb-user] How to enable compression in WiredTiger storage engine

[y***@gmail.com]

Hi,

I get the mongodb sources from github, and switch to v3.2 branch, I want to
try the compression for WiredTiger.

After launching mongod with default configurations, I saw the message
printed on console shows the storage engine is WiredTiger, and both Journal
and Collection will use snappy as their compressor.

However, I cannot see any code in the mongo folder will call snappy to do
(de)compression, only the code in third_parity/wiredtiger will do that,
will the third_party of wriedtiger be used?

I also tried to disable compression, and load some data with YCSB, there's
no db size change with/without compression, so I doubt whether compression
is enabled or not ?

It would be great if someone could help me on that, or any comment is
highly appreciated thanks a lot.

Thanks
-Yu
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[Rhys Campbell]

Details on how to change the compression level can be found
here https://www.mongodb.com/blog/post/new-compression-options-mongodb-30

Look for the -- wiredTigerCollectionBlockCompressor
<http://docs.mongodb.org/manual/reference/configuration-options/#storage.wiredTiger.collectionConfig.blockCompressor> option.
This can also be specified on the collection level.
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