MongoEngine specify read preference on query
I am using Mongo 2.6, Pymongo 2.7.2 and Mongoengine 0.8.7. For a particular read query, I want to use the secondary of my replica set. Hence, as specified in the mongoengine documentation here I wrote my query as follows :
from pymongo.read_preferences import ReadPreference
<collection_name>.objects().read_preference(ReadPreference.SECONDARY_PREFERRED)
However, the query is always going to the primary it seems ( The logs for this query are always seen only in the primary ). Is the syntax correct? If yes, how do I verify if the secondary is being queried?
mongodb pymongo mongoengine replicaset
asked May 12 '16 at 9:48
Yahya
1991620
add a comment |
I am using Mongo 2.6, Pymongo 2.7.2 and Mongoengine 0.8.7. For a particular read query, I want to use the secondary of my replica set. Hence, as specified in the mongoengine documentation here I wrote my query as follows :
from pymongo.read_preferences import ReadPreference
<collection_name>.objects().read_preference(ReadPreference.SECONDARY_PREFERRED)
However, the query is always going to the primary it seems ( The logs for this query are always seen only in the primary ). Is the syntax correct? If yes, how do I verify if the secondary is being queried?
mongodb pymongo mongoengine replicaset
asked May 12 '16 at 9:48
Yahya
1991620
Could be due to this bug if you're chaining another method such as skip, limit, etc.
– Jérôme
May 12 '16 at 16:05
I am chaining it with the order_by method but my Pymongo version is 2.7.2 and the bug is in any version >= 3.0. I guess it is broken in 2.7.2 as well.
– Yahya
May 13 '16 at 7:43
The message reads "As of now, the fix only works for pymongo ver < 3.0.", so I thought both 2.7 and 3+ where affected (although differently). You may want to try without order_by, to double-check.
– Jérôme
May 13 '16 at 8:44
add a comment |
I am using Mongo 2.6, Pymongo 2.7.2 and Mongoengine 0.8.7. For a particular read query, I want to use the secondary of my replica set. Hence, as specified in the mongoengine documentation here I wrote my query as follows :
from pymongo.read_preferences import ReadPreference
<collection_name>.objects().read_preference(ReadPreference.SECONDARY_PREFERRED)
However, the query is always going to the primary it seems ( The logs for this query are always seen only in the primary ). Is the syntax correct? If yes, how do I verify if the secondary is being queried?
mongodb pymongo mongoengine replicaset
asked May 12 '16 at 9:48
Yahya
1991620
I am using Mongo 2.6, Pymongo 2.7.2 and Mongoengine 0.8.7. For a particular read query, I want to use the secondary of my replica set. Hence, as specified in the mongoengine documentation here I wrote my query as follows :
from pymongo.read_preferences import ReadPreference
<collection_name>.objects().read_preference(ReadPreference.SECONDARY_PREFERRED)
However, the query is always going to the primary it seems ( The logs for this query are always seen only in the primary ). Is the syntax correct? If yes, how do I verify if the secondary is being queried?
mongodb pymongo mongoengine replicaset
mongodb pymongo mongoengine replicaset
asked May 12 '16 at 9:48
Yahya
1991620
asked May 12 '16 at 9:48
Yahya
1991620
asked May 12 '16 at 9:48
Yahya
1991620
asked May 12 '16 at 9:48
Yahya
1991620
asked May 12 '16 at 9:48
Yahya
1991620
1991620
Could be due to this bug if you're chaining another method such as skip, limit, etc.
– Jérôme
May 12 '16 at 16:05
I am chaining it with the order_by method but my Pymongo version is 2.7.2 and the bug is in any version >= 3.0. I guess it is broken in 2.7.2 as well.
– Yahya
May 13 '16 at 7:43
The message reads "As of now, the fix only works for pymongo ver < 3.0.", so I thought both 2.7 and 3+ where affected (although differently). You may want to try without order_by, to double-check.
– Jérôme
May 13 '16 at 8:44
add a comment |
Could be due to this bug if you're chaining another method such as skip, limit, etc.
– Jérôme
May 12 '16 at 16:05
I am chaining it with the order_by method but my Pymongo version is 2.7.2 and the bug is in any version >= 3.0. I guess it is broken in 2.7.2 as well.
– Yahya
May 13 '16 at 7:43
The message reads "As of now, the fix only works for pymongo ver < 3.0.", so I thought both 2.7 and 3+ where affected (although differently). You may want to try without order_by, to double-check.
– Jérôme
May 13 '16 at 8:44
Could be due to this bug if you're chaining another method such as skip, limit, etc.
– Jérôme
May 12 '16 at 16:05
Could be due to this bug if you're chaining another method such as skip, limit, etc.
– Jérôme
May 12 '16 at 16:05
I am chaining it with the order_by method but my Pymongo version is 2.7.2 and the bug is in any version >= 3.0. I guess it is broken in 2.7.2 as well.
– Yahya
May 13 '16 at 7:43
I am chaining it with the order_by method but my Pymongo version is 2.7.2 and the bug is in any version >= 3.0. I guess it is broken in 2.7.2 as well.
– Yahya
May 13 '16 at 7:43
The message reads "As of now, the fix only works for pymongo ver < 3.0.", so I thought both 2.7 and 3+ where affected (although differently). You may want to try without order_by, to double-check.
– Jérôme
May 13 '16 at 8:44
The message reads "As of now, the fix only works for pymongo ver < 3.0.", so I thought both 2.7 and 3+ where affected (although differently). You may want to try without order_by, to double-check.
– Jérôme
May 13 '16 at 8:44
add a comment |
1 Answer
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Figured out what the issue was. In the MongoEngine "connect" method, the replicaSet parameter needed to be specified as follows:
connect(db = "my_db", replicaSet = "my_replica_set_name", host = "hostname", port = "port_number")
The syntax of the read preference is correct as specified above. Passing in the replicaSet parameter made it work.
answered Jul 1 '16 at 6:34
Yahya
1991620
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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oldest
votes
Figured out what the issue was. In the MongoEngine "connect" method, the replicaSet parameter needed to be specified as follows:
connect(db = "my_db", replicaSet = "my_replica_set_name", host = "hostname", port = "port_number")
The syntax of the read preference is correct as specified above. Passing in the replicaSet parameter made it work.
answered Jul 1 '16 at 6:34
Yahya
1991620
add a comment |
Figured out what the issue was. In the MongoEngine "connect" method, the replicaSet parameter needed to be specified as follows:
connect(db = "my_db", replicaSet = "my_replica_set_name", host = "hostname", port = "port_number")
The syntax of the read preference is correct as specified above. Passing in the replicaSet parameter made it work.
answered Jul 1 '16 at 6:34
Yahya
1991620
add a comment |
Figured out what the issue was. In the MongoEngine "connect" method, the replicaSet parameter needed to be specified as follows:
connect(db = "my_db", replicaSet = "my_replica_set_name", host = "hostname", port = "port_number")
The syntax of the read preference is correct as specified above. Passing in the replicaSet parameter made it work.
answered Jul 1 '16 at 6:34
Yahya
1991620
Figured out what the issue was. In the MongoEngine "connect" method, the replicaSet parameter needed to be specified as follows:
connect(db = "my_db", replicaSet = "my_replica_set_name", host = "hostname", port = "port_number")
The syntax of the read preference is correct as specified above. Passing in the replicaSet parameter made it work.
answered Jul 1 '16 at 6:34
Yahya
1991620
answered Jul 1 '16 at 6:34
Yahya
1991620
answered Jul 1 '16 at 6:34
Yahya
1991620
answered Jul 1 '16 at 6:34
Yahya
1991620
1991620
add a comment |
add a comment |
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Could be due to this bug if you're chaining another method such as skip, limit, etc.
– Jérôme
May 12 '16 at 16:05
I am chaining it with the order_by method but my Pymongo version is 2.7.2 and the bug is in any version >= 3.0. I guess it is broken in 2.7.2 as well.
– Yahya
May 13 '16 at 7:43
The message reads "As of now, the fix only works for pymongo ver < 3.0.", so I thought both 2.7 and 3+ where affected (although differently). You may want to try without order_by, to double-check.
– Jérôme
May 13 '16 at 8:44