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BigSql is built upon db2 database but it thus miss a major architecture philosophy of Hadoop: " handle failure " If you launch a query and one of the designated worker node fails (hardware failure) then the request fails instead of being restarted on another node. If you have split your tablespaces on all the available disks of your system (Head and Worker nodes) and one of your hard drive fails (usual in a hadoop cluster with JBOD disks) then your whole tablespace get corrupted and the system is not able to handle it by itself.
Without these functions its impractical to scale BigSql to more than 100 nodes without loosing a lot of availability.
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