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mongodb_replset_lag
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executable file
·51 lines (40 loc) · 1.75 KB
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from munin.mongodb import MuninMongoDBPlugin
PRIMARY_STATE = 1
SECONDARY_STATE = 2
class MongoReplicaSetLag(MuninMongoDBPlugin):
vlabel = "seconds"
title = "MongoDB Replica Set Lag"
fields = [("optimeLag", {'label': "Oldest secondary lag"}), ("oplogLength", {"label": "Primary oplog length" })]
def _get_oplog_length(self):
oplog = self.connection['local'].oplog.rs
last_op = oplog.find({}, {'ts': 1}).sort([('$natural', -1)]).limit(1)[0]['ts'].time
first_op = oplog.find({}, {'ts': 1}).sort([('$natural', 1)]).limit(1)[0]['ts'].time
oplog_length = last_op - first_op
return oplog_length
def _get_max_replication_lag(self):
status = self.connection.admin.command('replSetGetStatus')
members = status['members']
primary_optime = None
oldest_secondary_optime = None
for member in members:
member_state = member['state']
optime = member['optime']
if member_state == PRIMARY_STATE:
primary_optime = optime.time
elif member_state == SECONDARY_STATE:
if not oldest_secondary_optime or optime.time < oldest_secondary_optime.time:
oldest_secondary_optime = optime.time
if not primary_optime or not oldest_secondary_optime:
raise Exception("Replica set is not healthy")
return primary_optime - oldest_secondary_optime
def execute(self):
oplog_length = self._get_oplog_length()
replication_lag = self._get_max_replication_lag()
return {
"optimeLag": replication_lag,
"oplogLength": oplog_length
}
if __name__ == "__main__":
MongoReplicaSetLag().run()