jepsen.nemesis.time — jepsen 0.1.10

Functions for messing with time and clocks.

bump-gen clj

(bump-gen test process)

Randomized clock bump generator. On random subsets of nodes, bumps the clock from -262 to +262 seconds, exponentially distributed.

bump-time! clj

(bump-time! delta)

Adjusts the clock by delta milliseconds.

clock-gen clj

(clock-gen)

Emits a random schedule of clock skew operations.

clock-nemesis clj

(clock-nemesis)

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

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

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

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

compile! clj

(compile! reader bin)

Takes a Reader to C source code and spits out a binary to /opt/jepsen/<bin>.

compile-resource! clj

(compile-resource! resource bin)

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

compile-tools! clj

(compile-tools!)

install! clj

(install!)

Uploads and compiles some C programs for messing with clocks.

reset-gen clj

(reset-gen test process)

Randomized reset generator. Performs resets on random subsets of the tests' nodes.

reset-time! clj

(reset-time!)

(reset-time! test)

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

strobe-gen clj

(strobe-gen test process)

Randomized clock strobe generator. On random subsets of the test's nodes, 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.

strobe-time! clj

(strobe-time! delta period duration)

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