Re: Replica Sets, failover, and drivers: try-except everything?

Thank you, this was seriously helpful!

On Jul 31, 6:42 am, GVP <gate...@...> wrote:
> So first off, you should try / except all database code. From the $m =
> new Mongo() right through to the save.
>
> > Is there a better way?
>
>  <at> Daniel: it depends. It's really about how you want to fail.
>
> You may be just fine with accepting outright failure and returning it
> to the UI: "your action failed, please try again". You may want to
> retry for a couple of seconds and then fail to the UI.
>
> Your code sample actually needs a timeout on the "waiting". A regular
> replica set fail-over will take a couple of seconds. But if something
> goes really wrong you don't want your web server in an infinite loop
> stacking up connections.
>
> > Am I overthinking this?
>
> Depending on your concern for write safety, you may be "underthinking"
> this.
>
> For example, you're using replica sets, but you have "safe=true". This
> only guarantees that the write was applied to the Primary. Python &
> PHP also have "w=n" parameter which ensures that data is replicated to
> a certain number of nodes before returning.
>
> With "safe=true", there's a possibility that your web server receives

Re: Installation problem on Linux

Excessive Disc Space for Replica Set

New to mongodb so if this is obvious, sorry.

I have a replica set with 3 servers.... one of my collections is ~2GB
based on a totalSize() stat.

HOWEVER, the actual disc space that seems to get used if I go to the
data directory is like 6 times that because I see a bunch of .0 .1 .2 .
3 .4 files
each going up to 2GB eventually for each file any ideas??

Having a 30 GB shared host and thinking I have more than enough disc
space for data/indexes/etc... but all my collections seem to have the
same issue, so I end up running out of disc space very quickly. Any
ideas??

Re: Excessive Disc Space for Replica Set

check this out first....
http://www.mongodb.org/display/DOCS/Excessive+Disk+Space

Re: Problem Installing the PHP Driver on Hostmonster

You probably should ask admin at hostmonster to do it for you if sudo is not supported.
-----Original Message-----
From: njsuperfreak <jeffery.vincent@...>
Sender: mongodb-user@...
Date: Sun, 31 Jul 2011 11:28:01 
To: mongodb-user<mongodb-user@...>
Reply-To: mongodb-user@...
Subject: [mongodb-user] Problem Installing the PHP Driver on Hostmonster

Greetings,

I am getting the following error when I run the "pecl install mongo"
command:

Cannot install, php_dir for channel "pecl.php.net" is not writeable by
the current user

I am trying to follow the steps outlined here:
http://www.mongodb.org/display/DOCS/PHP+Language+Center

I have the following permisions on my mongodb folder:
drwxr-xr-x  mongodb-linux-x86_64-static-legacy-1.8.2/

Also I was informed by Hostmonster that "sudo" user is not supported
because I am on a shared machine and is not needed.

Please help!

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PHP Driver seems to block and timeout if one of the servers is down in a replicaset

Still investigating this, but I keep reproducing it:

SUMMARY:
- I have 3 different servers running in a replica set.
- I am also running 2 separate web servers running php/lighttpd

PROBLEM:
- If I kill one of the mongo servers the replica set does a good job
at picking a new master, but my PHP scripts seem to hang and that
eventually just kills the web servers :(

Here is the PHP code used to connect (IPs are fake):

$dsn = 'mongodb://123.45.67.8, 123.45.67.9, 123.45.67.0';
$m = new Mongo($dsn, array("replicaSet" => "set"));

So, if I kill off one of those IPs then PHP seems to just hang and
then my server eventually can't keep up.

Am I doing something wrong or not understanding the php connection? I
thought it would pick a usable one quickly.

Re: Excessive Disc Space for Replica Set

I guess it's just the preallocated space. Oh well. Guess I'll get a
bigger box :)

On Jul 31, 11:40 pm, Nat <nat.lu...@...> wrote:
> check this out first....http://www.mongodb.org/display/DOCS/Excessive+Disk+Space

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Re: Installation problem on Linux

Re: PHP Driver seems to block and timeout if one of the servers is down in a replicaset

After more testing, it DOESN'T happen if I simply stop the service on
one of the servers with service mongod stop.
It happens if I take down the server so that it isn't online at all.

I am using PRIVATE IPs for the connections.

On Aug 1, 1:50 am, BrianGruber <webbr...@...> wrote:
> Still investigating this, but I keep reproducing it:
>
> SUMMARY:
> - I have 3 different servers running in a replica set.
> - I am also running 2 separate web servers running php/lighttpd
>
> PROBLEM:
> - If I kill one of the mongo servers the replica set does a good job
> at picking a new master, but my PHP scripts seem to hang and that
> eventually just kills the web servers :(
>
> Here is the PHP code used to connect (IPs are fake):
>
> $dsn = 'mongodb://123.45.67.8, 123.45.67.9, 123.45.67.0';
> $m = new Mongo($dsn, array("replicaSet" => "set"));
>
> So, if I kill off one of those IPs then PHP seems to just hang and
> then my server eventually can't keep up.
>
> Am I doing something wrong or not understanding the php connection? I
> thought it would pick a usable one quickly.

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Re: MongoDB C# Client Save Method

Thanks for the reply,
You're right that in this case I know that the documents are new,
but there might be some other cases when I'll need to update and I
don't want the client to distinguish between them.
I noticed that there is a save() function on the server API. Why
doesn't the client call it?
Is it because it implements the same logic you described? (check if
_id is null and call insert or update accordingly)

Thanks,
--Idan.

On Jul 31, 6:36 pm, Robert Stam <rstam10...@...> wrote:
> I'm not sure exactly how the Save method worked in the samus driver,
> but here's how it works in the 10gen C# driver:
>
> 1. If the driver can tell for sure it's a new document it calls Insert
> 2. Otherwise, the driver calls Update with Upsert flag
>
> The only way the driver can know for sure that it's a new document is
> if you leave the _id field uninitialized. Since you are setting the
> _id field in your application, the driver has no way of knowing
> whether it's a new document or not, and that's why it calls Update.
>
> From your description, since you know the documents are new, you can
> just call Insert directly instead of Save.
>
> On Jul 31, 11:19 am, Fontana <idan.am...@...> wrote:
>
>
>
>
>
>
>
> > Hi,
> > I recently updated my MongoDB server to version 1.8.2, and change my
> > client to use 10gen official client (1.1).
> > I have 2 capped collections in a single DB, with sizes 200MB and
> > 800MB.
> > Before I updated the client I used to call the save method (in the old
> > client I used samus/mongodb-csharp), and the save ran fast and
> > performed only insert to the collections. (the "_id" field is unique
> > for each save operation)
> > The problem I'm having now, when using the new client, is that the
> > save method takes lots of time. When I checked the mongoDB logs I
> > noticed that I have lots of updates and no inserts.
> > The items I'm saving all have unique "_id" field (set by the
> > application) and should perform insert not update.
> > BTW, I'm saving a BsonDocument with 3 fields: "_id"(long),
> > "v"(binary), "dt"(DateTime)
> > Any ideas?
>
> > Thanks,
> > --Idan.
>
> > I attached the stats() for both collections if it can help:
>
> > {
> >         "ns" : "MyDB.MyCollection1",
> >         "count" : 147644,
> >         "size" : 121005472,
> >         "avgObjSize" : 819.5759529679499,
> >         "storageSize" : 200000256,
> >         "numExtents" : 1,
> >         "nindexes" : 0,
> >         "lastExtentSize" : 200000256,
> >         "paddingFactor" : 1,
> >         "flags" : 0,
> >         "totalIndexSize" : 0,
> >         "indexSizes" : {
>
> >         },
> >         "capped" : 1,
> >         "max" : 2147483647,
> >         "ok" : 1
>
> > }
>
> > {
> >         "ns" : "MyDB.MyCollection2",
> >         "count" : 22784,
> >         "size" : 799495352,
> >         "avgObjSize" : 35090.21032303371,
> >         "storageSize" : 800000256,
> >         "numExtents" : 1,
> >         "nindexes" : 0,
> >         "lastExtentSize" : 800000256,
> >         "paddingFactor" : 1,
> >         "flags" : 0,
> >         "totalIndexSize" : 0,
> >         "indexSizes" : {
>
> >         },
> >         "capped" : 1,
> >         "max" : 2147483647,
> >         "ok" : 1
>
> > }

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