Configurable Zstd compression level does not work in PyMongo

Working with Data Drivers & ODMs
#1

MongoDB server 5.0.1
PyMongo 3.12.0

Zstd compression level setting is declared in MongoDB 5.0. But it doesn’t work for me in PyMongo.

Code:
coll_obj = trg_db_obj.create_collection(src_file_name[:-3], storageEngine={'wiredTiger': {'configString': 'block_compressor=zstd,zstdCompressionLevel=22'}})

Error:
pymongo.errors.OperationFailure: 22: Invalid argument. [1627214735:927020][2228:0x7fce9f9c1700], wiredtiger_config_validate: config_check_search, 65: unknown configuration key: 'zstdCompressionLevel': Invalid argument., full error: {'ok': 0.0, 'errmsg': "22: Invalid argument. [1627214735:927020][2228:0x7fce9f9c1700], wiredtiger_config_validate: config_check_search, 65: unknown configuration key: 'zstdCompressionLevel': Invalid argument.", 'code': 2, 'codeName': 'BadValue'}

#2

If I replace zstdCompressionLevel to zstd_compression_level, the result is the same.

#3

I believe those options are only configurable by way of MongoDB’s configuration file, not through the createCollection command.

1 Like
#4

Okay, let that be my feature request.

1 Like
#5

Currently facing the same problem, it would be very beneficial if the compression level could be set on a collection level.

1 Like
#6

Hi @Robin_Muller, @Platon_workaccount,

For server feature requests, please create a new suggestion on the MongoDB Feedback site including more information on your use case.

As noted earlier in this discussion, zstdCompressionLevel is a server-level configuration setting added in MongoDB 5.0. If you are using zstd as a blockCompressor and change the zstdCompressionLevel value, all subsequent collections created will inherit this default.

Regards,
Stennie

#7

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