mongorestore error: don’t know what to do with…

Posted: August 19th, 2011 | Author: | Filed under: mongodb | 2 Comments »

I like to develop for mongodb on my local machine to make sure everything is fast and won’t nuke one of our production dbs. To do this I often use the mongodump command to grab a collection and then load it locally so I can work with a snapshot of production data. Here is a problem I ran into recently that I thought would be worth blogging about. First I dumped the collection rob_job_metric:

mongodump –db data –collection rob_job_metric –out – > rob_job_metric.mongodump

Aftering moving it to my local machine, I tried mongorestore:

alex@Alexander-Braunsteins-iMac-2:scripts> ~/Downloads/mongodb-osx-x86_64-1.8.1/bin/mongorestore ~/Desktop/scripts/rob_job_metric.mongodump
connected to: ###########
don’t know what to do with [/Users/alex/Desktop/scripts/rob_job_metric.mongodump]

Really mongodb? I’m pretty sure you know what to do with this file as you just created it. After messing around a bit I discovered that mongorestore requires the file to end with .bson, even though the file was already in that format, just not named so:

alex@Alexander-Braunsteins-iMac-2:scripts> mv rob_job_metric.mongodump rob_job_metric.mongodump.bson
alex@Alexander-Braunsteins-iMac-2:scripts> ~/Downloads/mongodb-osx-x86_64-1.8.1/bin/mongorestore ~/Desktop/scripts/rob_job_metric_unique.mongodump.bson
connected to: ###########
Wed Aug 17 10:29:29 /Users/alex/Desktop/scripts/rob_job_metric.mongodump.bson
Wed Aug 17 10:29:29 going into namespace [scripts.rob_job_metric.mongodump]
22752893/23620007 96%
Wed Aug 17 10:29:32 113872 objects found


2 Comments on “mongorestore error: don’t know what to do with…”

  1. 1 Mathias Stearn said at 1:02 pm on August 19th, 2011:

    I’d suggest just putting the filename in the –out parameter rather than writing to a redirected stdout.

  2. 2 Clam said at 7:53 pm on January 15th, 2014:

    Thank you for the blog. It is very helpful.


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