MongoDB replication errors and Handling Methods

MongoDB replication errors and Handling Methods

Run rs. status () on the master node to view the corresponding errormsg.

The specific solution is as follows:

1. Error creating index 13111 field not found, expected type 16

This error occurs when you execute mongorestore to import data. The command used is

./Mongorestore-h localhost: 27100/data/backup/mongodb

Solution:

Change

./Mongorestore -- port 27100/data/backup/mongodb

2. error RS102 too stale to catch up

The RS102 error is returned when rs. status () is executed during master-slave synchronization. Because -- oplogSize = 128 is specified at startup (the oplog Log Size of the master node, measured in M, changes the oplog size and deletes the local. *, and then add -- oplogSize = * to restart, * to indicate the size.) When you insert big data into the master database, it may be too late to synchronize data to the slave database.

Solution:

Stop the Master/Slave database, copy the data of the master database to the slave database, and restart the service.

Reference

Http://www.mongodb.org/display/DOCS/Resyncing+a+Very+Stale+Replica+Set+Member

3. Command 'listdatabases' failed: need to login (response: {"errmsg": "need to login", "OK": 0 })

After the Master/Slave database is configured, it is found that only the local database can be connected, and other machines cannot connect.

Solution:

Remove -- keyFile at startup.

4. pymongo. errors. AutoReconnect: cocould not find master/primary

The MongoDB service may be suspended abnormally. Solution: delete mongod. lock and restart mongdb.

5. pymongo. errors. AutoReconnect: master has changed

This error occurs when python connects to the database through pymongo.

Solution:

Switch the connection code. Bigtb_corpus = pymongo. Connection ("lifeba.org", 27100)

Servers = "mongodb: // lifeba.org: 27100 /? Slaveok = true "bigtb_corpus = pymongo. Connection (servers)

6. Connection reset by peer

This error occurs during stress testing when Python is connected to MongoDB. When the number of connections is full, the connection is reset. Later, it was found that the reason was that the mongodb driver version was inconsistent. MongoDB is deployed in version 2.0.1. The driver installed on a machine connected to MongoDB is version 2.2.

As a result, each access connection increases without being released.

7. Replica Set master is not synchronized (RECOVERING, still syncing, not yet to minValid optime)

Use db. printSlaveReplicationInfo () and db. printReplicationInfo () to view the latest master-slave synchronization status.

Stop the slave database, delete all the database data, and restart the slave database. The slave database automatically synchronizes data from the master database.

8. Add a new slave machine to the existing master and slave nodes.

Copy the database of the host machine to the slave machine, start the slave database, and add the slave machine to the host machine: rs. add ("192.168.0.149: 27100 ")

9. Remove the master and slave nodes from MongoDB.

Stop the mongo service of all machines, delete the local. * file, delete the journal folder, remove -- replSet = rs in the startup command, and restart.

10. HOSTNAME Problems

ReplSet exception loading our local replset configuration object: 0 assertion src/mongo/db/repl/.../../db/../util/net/hostandport. h: 120

The default hostname is localhost. If this parameter is set to another name, an error is returned.

Master has changed exception

After the MongoDB Master/Slave database is configured, an Intranet ip address will also be used for connection. The solution is to use the hostname for connection.

11. initial sync need a member to be primary or secondary to do our initial sync

Synchronization in progress. data has not been synchronized yet. Wait for a while and check again.

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