When comparing Hazelcast vs SAP HANA Database, the Slant community recommends Hazelcast for most people. In the question“What are the best scalable In-Memory Databases?” Hazelcast is ranked 3rd while SAP HANA Database is ranked 7th. The most important reason people chose Hazelcast is:
Hazelcast's documentation is excellent, they have a full javadoc and very in-depth guides for performance tuning and all the bells and whistles of the framework.
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Pros
Pro Good documentation
Hazelcast's documentation is excellent, they have a full javadoc and very in-depth guides for performance tuning and all the bells and whistles of the framework.
Pro Open source
Hazelcast is a free and open source software released under the Apache 2 license.

Pro Cross platform clients
Pro 24/7 professional support available
Hazelcast has 24/7 professional support available for open source users.
Pro Easy to integrate with other SAP tools
SAP HANA database is designed to be used with other SAP branded tools with this you can easily import and export data to other SAP tools
Pro Very fast
SAP HANA Database uses parallel computing, caching and compress data to improve its computation speed. It has an average speed of 0.000476 ms per transaction.
Cons

Con Heavy learning curve
Con Very expensive
SAP HANA Database is expensive as you need to pay for the hardware and software licenses. Your cost also scales with how much memory you need. Its hardware alone cost $1,000,000.
Con Strict hardware and software requirements
Hardware requirements are very strict which makes it very hard to install and configure. Currently SAP HANA only supports hardware platforms that are Intel-based or IBM Power based. For the operating system only SUSE linux and Red Hat Enterprise linux are supported.
Con Limited skilled workers
There are only a few workers who knows how to use SAP HANA Database because its training is expensive and its public documentation is limited.
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