When comparing Fluentd vs ODE, the Slant community recommends Fluentd for most people. In the question“What are the best log management, aggregation & monitoring tools?” Fluentd is ranked 4th while ODE is ranked 35th. The most important reason people chose Fluentd is:
Gives structure to unstructured logs.
Specs
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Pros
Pro Logs everything in JSON
Gives structure to unstructured logs.
Pro Logs stored to FS buffer while network is down
Logs aren't lost due to network issues.
Pro In-stream processing
With a list of 150+ plugins, Fluentd can perform all kinds of in-stream data processing tasks.
Pro Huge plugin ecosystem
Fluentd has a plugin ecosystem that has resulted in developers creating over 150 plugins for the service.
Pro Prioritizes simplicity and robustness
For example, inputs and outputs have built-in support for buffering, load-balancing, timeouts and retries so to be able to deliver data reliably.
Pro Free and open source
Licensed under Apache 2.0.
Pro Routing based on tags
Pro Exponential retry wait
Pro Copy to multiple storages
Pro Based on CRuby
Pro Scales easily
ODE instances are independent of each other, so they don't have to worry about a peer being added/removed. This allows the cluster to grow without any performance hit on the log aggregation. There is no redundancy built-in, but you can always use the forwarder to duplicate data. There is no sharding configuration or any other penalty that comes up with scaling a cluster. The clustering configuration is also very easy where you just list out peers for one of the node in order for it to run a search query on the whole cluster and merge the results. Scales better than any other open source log management tool out there.
Pro Add new parsers as you like
You can add any parser you want to ODE.
Pro Highly customizable
Pro Easy to use
Cons
Con Difficult to setup
Requires a significant time investment to get up and running.
Con Still in beta
Opallios ODE seems to be still in beta, as such there may be issues or missing features which are not yet implemented.