|By AppDynamics Blog||
|April 13, 2012 05:00 AM EDT||
As data has grown exponentially at many sites, companies have been forced to horizontally scale their data. Some have turned to sharding of databases like Postrres or MySQL , while others have switched to newer NoSQL data systems. There have been many debates in the last few years about SQL vs. NoSQL data management systems and which is better. What many have failed to grasp, though, is how similar these systems are and how complex they both are to run in production in high scale.
Both of these systems represent what I call a Data Cloud. This Data Cloud is logical data set spread across many nodes. While developers have heated debates about which system is better and how to design code around it, those in DevOps usually struggle with very similar issues because the two systems are mostly the same. Both systems
- Run across many nodes with large amounts of data flowing between them and from/to the application
- Strain both the hardware of all nodes, and the network connecting them
- Maintain duplicate data across nodes for fault tolerance, and must have failover ability
- Must be tuned on a per node and cluster-wide bases
- Must allow for growth by adding additional nodes.
Running this Data Cloud in production presents a new set of challenges for DevOps, many of which are not well understood or addressed. One of the main challenges is the management and monitoring of these systems, for which few (if any) tools or products exist at this time.
When systems were smaller and you ran a single Database in production, you probably had all the necessary systems in place. With a plethora of products for Management, monitoring, visualizing data, and backups, it was not hard to be successful and meet your SLAs.
But now all this is much more complex once you move into the world of the Data Cloud. Now you have a large number of nodes, all representing the same system and still needing to meet the same SLAs as the old simple DB from before. Let us look at the challenges for running a production Data Cloud successfully.
Do you know how many nodes you need? How many nodes do you put in each replica set? How much latency and throughput do you need in your network for the nodes to communicate fast enough? What is the ideal hardware to use for each node to balance performance with costs?
How do you monitor dozens, hundreds or even thousands of nodes all at once? How do you get a unified view of your data cloud, and then drill down to the problem nodes? Are there even any off-the-shelf monitoring tools that can help? Your old monitoring tool won’t be very useful anymore unless you are willing to look at every node one by one to see what is going on there.
How do you set up a common set of alerts across all nodes? And how do you keep your alert thresholds in sync as you add nodes and remove them? More importantly, even assuming you have alerting in place, once staff receives critical alerts, how will they know where to find the troubled node in the massive cloud, or whether it’s a node level issue or more global in nature? This must be done quickly during critical outages.
How does your staff view the data when it is distributed? In case of data inaccuracy, how can they quickly identify the faulty nodes and fix up the data?
As performance degrades, how do you troubleshoot and identify the bottlenecks? How do you find which nodes by be the cause of the problem? How do you improve performance across all the nodes.
Data Cloud Management
How do you back up all the data while consistently tracking which nodes were backed up successfully and when? How do you make schema changes across all the nodes in one consistent step without breaking your app? And how do you make configuration changes on various nodes or across all nodes? And how do you track the configurations of each node and keep them consistent across your system?
By now you should see that there is a lot to think about before endeavoring to launch a production Data Cloud. Too many companies focus all their energies on deciding which DB or NoSQL system to use and developing their apps for it. But that might turn out to be the lesser of your challenges once you struggle to put the system into production. Be sure you can answer all the questions I have listed above before your launch.
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