top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

Facebook Login
Site Registration
Print Preview

replication issue from ec2 to my network ..

+2 votes
25 views

I have configured replication from EC2 mysql instance to another mysql instance on our network via vpn in between. Sometimes it is showing no errors on the slave but the slave falls behind . When I issue the commands stop slave ; start slave ; it again catches up with the master.

What is the reason for this ? how to resolve this ?

posted Jul 17, 2013 by anonymous

Looking for an answer?  Promote on:
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

Similar Questions
+2 votes

Is there a way I can clear my session data from the browser? This is for debugging when I change something. Currently no matter what I do short of exiting the browser, my session data is always retained. This makes testing very cumbersome. I am using PHP/MySQL for development.

+1 vote

We have replication set-up, where we cater to huge amounts of data. Since quite some time, we have been facing issues wherein the slave lags behind master quite a lot.

So, yesterday we were able to setup parallel replication, by incorporating the following changes ::

a) To begin with, partitioned some tables into dedicated databases.

b) Set up the "slave-parallel-workers" parameter.

The above seems to work functionally fine, but we have one doubt/query about the scalability of this solution.

First, I will jot down the flow as far as I understand (please correct if wrong) ::

"Even in parallel-replication scenario, the master writes all the binlog (combined for all databases) in just one file, which then gets passed onto the slave as single-file itself. Thereafter, all the replication commands (combined for all databases) are written sequentially onto one slave-relay file.

Thereafter, as per the documentation, the slave-SQL-Thread acts as the manager, handing over commands to worker-threads depending upon the databases on which the commands run."

So far, so good. However, what would happen if the slave-relay file contains the following ::

db1-statement-1 (short-running)
db2-statement-1 (very, very long-running)
db2-statement-2 (short-running)
db1-statement-2 (short-running)
db1-statement-3 (short-running)

We will be grateful if someone could please clarify, as to how the above statements will be managed among the Manager and the Worker-Threads (let's say there is just one worker-thread-per-db) ?

In particular, does the Manager thread creates internal slave-relay-log-files, one for per database-statements?

+3 votes

I am trying to understand MySQL statement based replication with LOAD DATA LOCAL INFILE statement'.

According to manual -
https://dev.mysql.com/doc/refman/5.0/en/replication-features-load.html -
LOAD DATA LOCAL INFILE is replicated as LOAD DATA LOCAL INFILE, however, I am seeing it replicated as 'LOAD DATA INFILE'.

I was wondering why slave isn't getting LOAD DATA LOCAL INFILE statements. Master is using MySQL 5.0 and slave is using MySQL 5.5

+1 vote

Looking for some help configuring 5.0.45 master-slave replication. Here's my scenario...

We have a heavily loaded 30gb 5.0.45 DB we need to replicate via master-slave configuration to a new, beefier server running same mysql 5.0.45, and then cutover to the new server. Due to extreme SAN congestion and a grossly overloaded master server, our DB dumps take 5.5 hours. But we cannot afford that much downtime or locking during the replication transition; we can manage 10-15 minutes, but more is very problematic.

I understand that "FLUSH TABLES WITH READ LOCK" will lock the tables for the duration of the 5.5 hour dump. Is this true?

If so, we'd like to dump/initialize/sync slave WITHOUT any locking anything the master for more than a few seconds if at all possible. Will this give us the dump we need?

 mysqldump --single-transaction --master-data --all-databases
0 votes

I have been asked to set up multiple database replication which I have done before for simple cases however there are some nuances with this instance that add some complexity and I'd like to hear your collective expertise on this proposed scenario:-

1) Single master database
2) n (probably 3 to start with) number of slave databases
3) All but 5 tables (123 tables in total) are to be replicated from the master to all the slaves
4) 3 tables from the slaves are to be replicated back to the master

It is mainly item 4) that concerns me - the primary ID's are almost certain to collide unless I seed the auto increment ID to partition the IDs into separate ranges or does MySQL handle this issue?
There are some foreign keys on one of the 3 slave to master tables but they are pointing at some extremely static tables that are very unlikely to change. Is the above a feasible implementation...?


Useful Links with Similar Problem
Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...