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EVA-1077 and EVA-1092 - Read workloads from configuration files + other changes

Created by: sundarvenkata-EBI

Made the following updates

  • Facilitate reading of workload configuration from JSON files
  • Better formatting of failure messages in Samplers
  • Switch to separate insert into a reverse lookup table instead of materialized views in Cassandra due to possible deprecation of materialized views - https://www.mail-archive.com/user@cassandra.apache.org/msg54073.html
  • Make insertion logic somewhat uniform across databases and add timestamps to avoid collisions during multiple runs
  • Add explicit majority "Read Concern" for MongoDB reads since that is not the default for versions >= 3.4

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