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Can anybody comment how this compares to open source alternatives [1] [2] ?

[1] https://clickhouse.yandex/ [2] https://eventql.io/

As far as I can see, the design shares some similarities with ClickHouse.

LittleTable sounds less performant than ClickHouse:

LittleTable - "returns 500,000 rows/second"

ClickHouse - "processes hundreds of millions to more than a billion rows and tens of gigabytes of data per single server per second."

LittleTable also seems to be much less flexible (e.g. ClickHouse offers quite a few different storage engines, views, materialized views, and other goodies).

ClickHouse rocks.

The Yandex offering, as far as I can tell, is the best open source TSDB.

It's not a TSDB. It doesn't support ingestion without some fancy batching. The insert rate will be too limited without that. MergeTree was designed for batch processing, not for real-time processing.

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