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Ran 25 Sep 2018 04:19AM UTC

Files 27

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Committed 25 Sep 2018 04:13AM UTC coverage: 80.396% (-0.4%) from 80.769%

Job # 1613.1

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push

travis-ci

Committed by

web-flow

Commit Message

Add a Jepsen style bank test for Badger (#577)

**Breaking Change**

This change breaks Value API. Instead of Value returning a byte slice, we now expose the byte slice from within a function. This is because when we read a value, we acquire a read lock on the value log. With the previous API it was possible for a transaction to deadlock, if multiple reads are done on the same log file, and those read locks get interleaved with a write lock caused by log file rotation. The new API fixes that by releasing the lock before another value is read; and also makes it obvious to the end user that they must copy the value to be able to use it outside the function.

This change also simplifies the transaction timestamp logic, learning from Dgraph. It simplifies it down to use just one variable `nextTxnTs` for tracking timestamps.

This change also adds a Jepsen style bank test for Badger, which is currently showing some transaction violations, needing further investigation.

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4470 of 5560 relevant lines covered (80.4%)

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