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Error when creating custom write concern using tags
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CS  
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 More options Oct 12 2012, 8:35 pm
From: CS <cslecl...@gmail.com>
Date: Fri, 12 Oct 2012 17:35:49 -0700 (PDT)
Local: Fri, Oct 12 2012 8:35 pm
Subject: Error when creating custom write concern using tags
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Hi folks,

I'm having some trouble creating a custom write concern using tags in 2.0.7
and 2.2.0, I get the following error:

"errmsg" : "exception: mode { dc: 2.0 } requires 2 tagged with dc, but only
1 with this tag were found",

However, there is more than 2 dc tags in the config:
rs_intg:PRIMARY> rs.conf()
{
        "_id" : "rs_intg",
        "version" : 9,
        "members" : [
                {
                        "_id" : 0,
                        "host" : "mongo-test01v:27017",
                        "tags" : {
                                "dc" : "p"
                        }
                },
                {
                        "_id" : 1,
                        "host" : "mongo-test02v:27017",
                        "tags" : {
                                "dc" : "p"
                        }
                },
                {
                        "_id" : 2,
                        "host" : "mongo-test03v:27017",
                        "tags" : {
                                "dc" : "p"
                        }
                },
                {
                        "_id" : 3,
                        "host" : "mongo-test04v:27017",
                        "priority" : 0,
                        "hidden" : true,
                        "tags" : {
                                "backup" : "b"
                        }
                }
        ]

}

Trying to create the write concern:
rs_intg:PRIMARY> cfg = rs.conf()
...
rs_intg:PRIMARY> cfg.settings = { getLastErrorModes : { production : { dc:
2 } } }
{ "getLastErrorModes" : { "production" : { "dc" : 2 } } }
rs_intg:PRIMARY> rs.reconfig(cfg)
{
       * "errmsg" : "exception: mode { dc: 2.0 } requires 2 tagged with dc,
but only 1 with this tag were found",*
        "code" : 14831,
        "ok" : 0

}

But if I set it to 1, then it works:
rs_intg:PRIMARY> cfg.settings = { getLastErrorModes : { production : { dc:
1 } } }
{ "getLastErrorModes" : { "production" : { "dc" : 1 } } }
rs_intg:PRIMARY> rs.reconfig(cfg)
{ "ok" : 1 }

The status appears to be ok:
rs_intg:PRIMARY> rs.status()
{
        "set" : "rs_intg",
        "date" : ISODate("2012-10-13T00:27:21Z"),
        "myState" : 1,
        "members" : [
                {
                        "_id" : 0,
                        "name" : "mongo-test01v:27017",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 182,
                        "optime" : {
                                "t" : 1350087984000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-10-13T00:26:24Z"),
                        "lastHeartbeat" : ISODate("2012-10-13T00:27:20Z"),
                        "pingMs" : 0
                },
                {

                        "_id" : 1,
                        "name" : "mongo-test02v:27017",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "uptime" : 182,
                        "optime" : {
                                "t" : 1350087984000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-10-13T00:26:24Z"),
                        "self" : true
                },
                {
                        "_id" : 2,
                        "name" : "mongo-test03v:27017",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 152,
                        "optime" : {
                                "t" : 1350087984000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-10-13T00:26:24Z"),
                        "lastHeartbeat" : ISODate("2012-10-13T00:27:20Z"),
                        "pingMs" : 1
                },
                {
                        "_id" : 3,
                        "name" : "mongo-test04v:27017",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 126,
                        "optime" : {
                                "t" : 1350087984000,
                                "i" : 1
                        },
                        "optimeDate" : ISODate("2012-10-13T00:26:24Z"),
                        "lastHeartbeat" : ISODate("2012-10-13T00:27:20Z"),
                        "pingMs" : 0,
                        "errmsg" : "syncing to: mongo-test02v:27017"
                }
        ],
        "ok" : 1

}

Any suggestions appreciated, thanks!

cs


 
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Rob Moore  
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 More options Oct 12 2012, 9:11 pm
From: Rob Moore <robert.allanb...@gmail.com>
Date: Fri, 12 Oct 2012 18:11:39 -0700 (PDT)
Local: Fri, Oct 12 2012 9:11 pm
Subject: Re: Error when creating custom write concern using tags
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I found this confusing at first too.

The number in the getLastErrorModes is the number of _unique values_ for
the tag name.  Not the number of replicas with that tag.

In your example you have 1 unique value for the tag name "dc".  That is
"p".  The error is saying the write mode will never finish since there are
not two unique "dc"s to replicate to.

The intent is that you can force the write across different sets of
replicas.  Not that it be replicated to N of the total set. (You still have
'w' for that.)

Does that help?

Rob.


 
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CS  
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 More options Oct 12 2012, 11:04 pm
From: CS <cslecl...@gmail.com>
Date: Fri, 12 Oct 2012 20:04:14 -0700 (PDT)
Local: Fri, Oct 12 2012 11:04 pm
Subject: Re: Error when creating custom write concern using tags
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Ah, yes got it, thank you!


 
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