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Data warehousing experts, including the Co-creator of Apache Arrow (>65 million downloads a month) and Co-founder of Dremio, announce a seed funding round of $20M, along with free access to an entirely
Sundeck Announces the Public Availability of Its Query Engineering ...
Discover the pros and cons of Apache Kafka for data streaming in combination with Apache Flink (or Kafka Streams) for stream processing.
When a user submits a query to a database, the optimizer translates the query string to an intermediate representation (IR) and applies various transformations to find the optimal execution plan. Apache Calcite uses relational operators as the intermediate representation. In this blog post, we discuss the design of the relational operators in Apache Calcite.
The other day at work, we had a situation where we suspected a thread leak in one particular service, i.e. code which continuously starts new threads, without taking care of ever stopping them again. Each thread requires a bit of memory for its stack space, so starting an unbounded number of threads can be considered as a form of memory leak, causing your application to run out of memory eventually. In addition, the more threads there are, the more overhead the operating system incurs for scheduling them, until the scheduler itself will consume most of the available CPU resources. Thus itR...