Module: workloads/mongos_50read_50write

This file tests that routing operations through a mongos does not impose an overhead greater than 30% (direct v passthrough and passthrough v sharded). That is, determine the penalty imposed by sharding.

Test

Compare the throughput of a fixed workload for various configurations. This workload alternates single reads (findOne) and writes (insert).

The routes tested are:

1. direct: bypass the mongos and send operations directly to a replica set primary.
2. pass through: route operations through a mongos to an unsharded collection.
3. sharded: route operations through a mongos to a shard collection.

The pass / fail ratios are:

1. passthrough / direct > 0.7
2. sharded / direct > 0.7

Results are reported as the following ratios:

1. passthrough / direct
2. sharded / direct

Setup

non-mongos configuration versus the configuration behind a mongos and config server

Notes

• The collection namespace is mongos_50read_50write.test.
• The collection is sharded using a hashed shard key.
• This test uses a varying number of threads.
• The document being inserted is padded with a string of 'x's to ensure it is 512B in size.
• The test is run for a fixed period of time, 3 minutes in this case.

Owning-team

mongodb/sharding