Problem with mongo_mem

[mgalkiewicz]

I cannot run mongo_mem:

# munin-run mongo_mem 
Traceback (most recent call last):
  File "/etc/munin/plugins/mongo_mem", line 60, in 
    doData()
  File "/etc/munin/plugins/mongo_mem", line 35, in doData
    for k,v in getServerStatus()["mem"].iteritems():
KeyError: 'mem'

The rest works fine. My munin-node version: 1.4.5-3. OS Debian Squeeze.

[alaz]

What is the server version?

[mgalkiewicz]

The same: 1.4.5-3

[alaz]

Really strange. Can you run db.serverStatus() in mongo shell and post here the result?

[mgalkiewicz]

MongoDB shell version: 1.6.3
connecting to: test
> db.serverStatus()
{
        "version" : "1.6.3",
        "uptime" : 255280,
        "uptimeEstimate" : 253509,
        "localTime" : "Mon Sep 19 2011 10:03:04 GMT+0200 (CET)",
        "globalLock" : {
                "totalTime" : 255280475334,
                "lockTime" : 3404631,
                "ratio" : 0.000013336824900319934,
                "currentQueue" : {
                        "total" : 0,
                        "readers" : 0,
                        "writers" : 0
                }
        },
        "mem" : {
                "bits" : 64,
                "resident" : 21,
                "virtual" : 200,
                "supported" : true,
                "mapped" : 80
        },
        "connections" : {
                "current" : 2,
                "available" : 817
        },
        "extra_info" : {
                "note" : "fields vary by platform",
                "heap_usage_bytes" : 394464,
                "page_faults" : 13
        },
        "indexCounters" : {
                "btree" : {
                        "accesses" : 1,
                        "hits" : 1,
                        "misses" : 0,
                        "resets" : 0,
                        "missRatio" : 0
                }
        },
        "backgroundFlushing" : {
                "flushes" : 4254,
                "total_ms" : 138,
                "average_ms" : 0.03244005641748942,
                "last_ms" : 0,
                "last_finished" : "Mon Sep 19 2011 10:02:24 GMT+0200 (CET)"
        },
        "cursros" : {
                "totalOpen" : 0,
                "clientCursors_size" : 0,
                "timedOut" : 0
        },
        "opcounters" : {
                "insert" : 13,
                "query" : 37,
                "update" : 1,
                "delete" : 5,
                "getmore" : 0,
                "command" : 89
        },
        "asserts" : {
                "regular" : 0,
                "warning" : 0,
                "msg" : 0,
                "user" : 6,
                "rollovers" : 0
        },
        "ok" : 1
}

[alaz]

Thanks! serverStatus has a mem section, as it should. And this is expected by mongo_mem plugin.

mongo_mem (like other plugins) reads this data from MongoDB's REST interface -- check if http://localhost:28017/_status contain mem section as well... I suspect it does.

Frankly, I have no other ideas.

[mgalkiewicz]

It does not:

{ "serverStatus" : { "version" : "1.6.3", "uptime" : 255850, "uptimeEstimate" : 254074, "localTime" : { "$date" : 1316419954279 }, "globalLock" : { "totalTime" : 255849881066, "lockTime" : 3404631, "ratio" : 1.330714318026878e-05, "currentQueue" : { "total" : 0, "readers" : 0, "writers" : 0 } }, "connections" : { "current" : 1, "available" : 818 }, "indexCounters" : { "btree" : { "accesses" : 1, "hits" : 1, "misses" : 0, "resets" : 0, "missRatio" : 0 } }, "backgroundFlushing" : { "flushes" : 4264, "total_ms" : 138, "average_ms" : 0.0323639774859287, "last_ms" : 0, "last_finished" : { "$date" : 1316419944742 } }, "cursros" : { "totalOpen" : 0, "clientCursors_size" : 0, "timedOut" : 0 }, "opcounters" : { "insert" : 13, "query" : 37, "update" : 1, "delete" : 5, "getmore" : 0, "command" : 89 }, "asserts" : { "regular" : 0, "warning" : 0, "msg" : 0, "user" : 6, "rollovers" : 0 }, "note" : "run against admin for more info" }, "buildinfo" : { "version" : "1.6.3", "gitVersion" : "nogitversion", "sysInfo" : "Linux bobek-a0 2.6.32-5-amd64 #1 SMP Fri Sep 17 21:50:19 UTC 2010 x86_64 BOOST_LIB_VERSION=1_42", "bits" : 64, "debug" : false } }

[alaz]

A-ha! this discussion is probably relevant

[mgalkiewicz]

The problem is fixed in mongodb 1.7.6 or later.