23 Aug

CH-BenCHmark for MS SQL Server – HTAP benchmarking

There aren’t many benchmarks which allow you to test your systems against a hybrid OLTP and OLAP workloads. CH-BenCHmark fills that gap by combining TPC-C and TPC-H. You can download the source from the linked site or you can use something like OLTPBench (a collection of benchmarks). However, the TPC-H modified queries are not written for SQL server. In this article, I will add the modified CH-BenCHmark OLAP queries for SQL Server.

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03 Apr

Split brain issue in elasticsearch- 2 node Cassandra For Titan graph database

Split brain issue in elastic search

I recently configured a 2-node Cassandra cluster with elastic search installed in both nodes creating another 2-node cluster (Cassandra cluster was built using DataStax OpsCenter). Soon after I configured my cluster, I got to know that there are x + 1 issues when we try to get it done with only 2 nodes.

Split brain problem in elastic search

When there are, 2 or more nodes acting like master nodes we call it a split brain. This can happen when one node does not know that it is connected to a cluster with a master. When there is more than 1 master, indexing requests will be completed by both nodes and after some time two copies of the shard are diverged. We might have to do full re-indexing to overcome this issue. If you need more information about the split-brain problem here.

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