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52 lines
1.8 KiB
Text
52 lines
1.8 KiB
Text
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from vendor.munin.mongodb import MuninMongoDBPlugin
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PRIMARY_STATE = 1
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SECONDARY_STATE = 2
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class MongoReplicaSetLag(MuninMongoDBPlugin):
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vlabel = "seconds"
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title = "MongoDB Replica Set Lag"
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fields = [("optimeLag", {'label': "Oldest secondary lag"}), ("oplogLength", {"label": "Primary oplog length" })]
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def _get_oplog_length(self):
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oplog = self.connection['local'].oplog.rs
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last_op = oplog.find({}, {'ts': 1}).sort([('$natural', -1)]).limit(1)[0]['ts'].time
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first_op = oplog.find({}, {'ts': 1}).sort([('$natural', 1)]).limit(1)[0]['ts'].time
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oplog_length = last_op - first_op
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return oplog_length
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def _get_max_replication_lag(self):
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status = self.connection.admin.command('replSetGetStatus')
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members = status['members']
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primary_optime = None
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oldest_secondary_optime = None
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for member in members:
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member_state = member['state']
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optime = member['optime']
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if member_state == PRIMARY_STATE:
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primary_optime = optime.time
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elif member_state == SECONDARY_STATE:
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if not oldest_secondary_optime or optime.time < oldest_secondary_optime:
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oldest_secondary_optime = optime.time
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if not primary_optime or not oldest_secondary_optime:
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raise Exception("Replica set is not healthy")
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return primary_optime - oldest_secondary_optime
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def execute(self):
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oplog_length = self._get_oplog_length()
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replication_lag = self._get_max_replication_lag()
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return {
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"optimeLag": replication_lag,
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"oplogLength": oplog_length
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}
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if __name__ == "__main__":
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MongoReplicaSetLag().run()
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