Hi, Which Ignite version do you use? Have you enabled any optional ignite libs? Am I right that you're trying to call Ignite REST API? Do you know call to which endpoint produces described error? Which client do you use for calling this endpoint? Can you repeat this call via other tools like CURL and check that error is reproducible? Do you use some kind of SSL termination for ignite REST API?
Also it looks like you cluster is also facing some network/discovery issues (because of "all partition owners have left the grid, partition data has been lost" messages). Are you sure that your network is OK? PS. I didn't find any tomcat usage in ignite repo (at least in current master), so I'm struggling to imagine how can this issue may appear in ignite, so please give us more details of your Ignite environment.
