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Type:
Bug
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Resolution: Incomplete
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Priority:
Major - P3
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None
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Affects Version/s: 2.2.2, 2.4.9
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Component/s: Diagnostics, Networking, Querying
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None
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ALL
Configuration for test:
Sharding database name video_user_data is two ReplicaSet.
ReplicaSet-1
video-test-mongodb-1:> rs.conf()
{
"_id" : "video-test-mongodb-1",
"version" : 3,
"members" : [
{
"_id" : 0,
"host" : "mongo01a.vd:27018"
},
{
"_id" : 1,
"host" : "mongo01b.vd:27018"
},
{
"_id" : 2,
"host" : "mongo01c.vd:27018"
}
]
}
ReplicaSet-2
video-test-mongodb-2:SECONDARY> rs.conf()
{
"_id" : "video-test-mongodb-2",
"version" : 3,
"members" : [
{
"_id" : 0,
"host" : "mongo02a.vd:27018"
},
{
"_id" : 1,
"host" : "mongo02b.vd:27018"
},
{
"_id" : 2,
"host" : "mongo02c.vd:27018"
}
]
}
Raised over them mongos.
The problem arises when one of the RS lost PRIMARY.
simple script on python for test
#!/usr/bin/env python # -*- coding: UTF-8 -*- import pymongo conn = pymongo.Connection('mongo01b.vd:27017') db = conn.video_user_data coll = db.films counter=0 for user in coll.find({},partial=True): counter+=1 print "%s" % counter
Normal script work:
mongo01b.vd:~# ./get.py 96601
Critical bug for work:
mongo01b.vd:~# time ./get.py Traceback (most recent call last): File "./get.py", line 16, in <module> for user in coll.find({},partial=True): File "/usr/lib/python2.6/dist-packages/pymongo/cursor.py", line 814, in next if len(self.__data) or self._refresh(): File "/usr/lib/python2.6/dist-packages/pymongo/cursor.py", line 763, in _refresh self.__uuid_subtype)) File "/usr/lib/python2.6/dist-packages/pymongo/cursor.py", line 720, in __send_message self.__uuid_subtype) File "/usr/lib/python2.6/dist-packages/pymongo/helpers.py", line 100, in _unpack_response error_object["$err"]) pymongo.errors.OperationFailure: database error: ReplicaSetMonitor no master found for set: video-test-mongodb-2 real 0m32.829s user 0m0.056s sys 0m0.000s
Questions:
1) Why is it taking so long detection problem? During this time, synchronous backend, under heavy load completely kill all the request queue
2) With the loss of one of the RS, I expect that I can get data from other RS database sharded cluster.
Maybe I'm wrong somehow use the driver?
mongodb version:
mongodb=1:2.4.9.yandex1
tnx!