Comments on leifw: 11 Buggy Disappointments in MongoDB

This is an informative and interesting post for I ...

2012-02-07T19:10:14.990-07:00

This is an informative and interesting post for I think it is very useful and knowledgeable.

Claim #11 is nonsense. If you reorganize stuff on ...

2011-06-11T08:53:40.380-06:00

Claim #11 is nonsense. If you reorganize stuff on any database system you need additional space. What is your point here?

Regarding #4, I agree it's too easy to crash m...

2011-06-10T05:57:48.506-06:00

Regarding #4, I agree it's too easy to crash mongod in strange ways with badly behaved JS.

We've raised https://jira.mongodb.org/browse/SERVER-3131 and are watching https://jira.mongodb.org/browse/SERVER-3012, although this is with $where clause rather than db.eval.

#7 10Gen is switching the Javascript shell from Sp...

2011-06-08T19:20:46.830-06:00

#7 10Gen is switching the Javascript shell from SpiderMonkey to V8 which should help the single thread MapReduce issue. The way I understand it, MapReduce is single-thread is because of SpiderMonkey's dependency on global variables, making multiple instances not possible.

#1: I just committed a fix for this (supporting un...

2011-05-13T13:36:56.102-06:00

#1: I just committed a fix for this (supporting undefined in export/import), so it should be better in the future.

#2: I've reproduced this and another guy is working it (https://jira.mongodb.org/browse/SERVER-3086).

#3: Please report any information you can give us about 3 at https://jira.mongodb.org/!

#6: this is a known bug, unfortunately: https://jira.mongodb.org/browse/SERVER-925

#8: I don't understand what you mean, are you trying to run a bunch of shards on machine?

#10 and #11: simple compaction has already been implemented in the 1.9 branch: you could start up a server with 1.9, compact it, then start it up with 1.8 again.

Taking your middle points together: multithreading MapReduce is something we really want to do (see https://jira.mongodb.org/browse/SERVER-463... one of our most-voted-for bugs) but it's very tricky. Our first step is moving to V8, which should happen for 2.0. After that we'll be working on getting MapReduce working across multiple cores.

We're actually also working on a much simpler aggregation system (as MapReduce is overkill for a lot of people) that should make most aggregations possible to do without JavaScript. You'll be able to create a pipeline of filters, projections, groupings, tees to output collections, etc (this is for 2.0).

from last few days I am seeing quite a lot Mango D...

2011-05-11T07:37:40.152-06:00

from last few days I am seeing quite a lot Mango DB articles in Dzone and mostly in favor this is something which reveals other side of mangod db. thanks for this.

Javin
10 basic mysql commands to remember

As for item 11 (which burned me twice already), mo...

2011-05-11T06:32:24.274-06:00

As for item 11 (which burned me twice already), mongo 1.9 will include a compact function that will reclaim that space without the need of available free space on the drive.

Have you entered issues in jira.mongodb.org on the...

2011-05-10T19:41:41.826-06:00

Have you entered issues in jira.mongodb.org on these, especially 1-3?