Randomized clock bump generator targeting a random subsets of nodes.

A function which returns a clock bump generator that bumps the clock from -262 to +262 seconds, exponentially distributed. (select test) is used to select which subset of the test’s nodes to use as targets in the generator.

Adjusts the clock by delta milliseconds. Returns the time offset from the current local wall clock, in seconds.

Emits a random schedule of clock skew operations. Always starts by checking the clock offsets to establish an initial bound.

Generates a nemesis which manipulates clocks. Accepts four types of operations:

{:f :reset, :value [node1 ...]}

{:f :strobe, :value {node1 {:delta ms, :period ms, :duration s} ...}}

{:f :bump, :value {node1 delta-ms ...}}

{:f :check-offsets}

Takes a time in seconds since the epoch, and subtracts the local node time, to obtain a relative offset in seconds.

Takes a Reader to C source code and spits out a binary to /opt/jepsen/, if it doesn’t already exist.

Given a resource name, spits out a binary to /opt/jepsen/.

Returns the clock offset of this node, in seconds.

Where do we install binaries to?

Uploads and compiles some C programs for messing with clocks.

Parses a decimal time in unix seconds since the epoch, provided as a string, to a bigdecimal

Randomized reset generator. Performs resets on random subsets of the test’s nodes.

A function which returns a generator of reset operations. Takes a function (select test) which returns nodes from the test we’d like to target for that clock reset.

Resets the local node’s clock to NTP. If a test is given, resets time on all nodes across the test.

Randomized clock strobe generator targeting a random subsets of the test’s nodes.

A function which returns a clock strobe generator that introduces clock strobes from 4 ms to 262 seconds, with a period of 1 ms to 1 second, for a duration of 0-32 seconds. (select test) is used to select which subset of the test’s nodes to use as targets in the generator.

Strobes the time back and forth by delta milliseconds, every period milliseconds, for duration seconds.