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HBase Availability - Mean Time to Failure & Recovery Time

We are using version of HBase and are planning for high availability testing. While the entire scheme to enable the cluster to be highly available is clear, I wanted to get some idea about HBase Service lifetime in terms of Mean-Time to Failure and Time of Recovery in cases of failure. Any historic evidences will also help, as it will be vital for us to calculate the actual availability of the system across an year.

While I understand that HBase provides more of active/passive mode of seamless high availability of Masters, but any failure, will impact the performance to some extent and this calculation will help in deriving the actual number of nodes that we should consider without compromising on the performance as well, while the system is available.

The article below from HBase wiki indicates that the Master switching takes a couple of seconds to happen but I think the volume of data, replay logs and the region availability will also play a key role in order to make the switch complete, and hence would request guidance around the complete mechanism and recovery time.


Any ideas/facts would be very helpful .
Thanks & Regards
Pankaj Misra
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