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scylla/src/scylla/counter.clj
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(ns scylla.counter | |
(:require [clojure [pprint :refer [pprint]]] | |
[clojure.tools.logging :refer [info]] | |
[jepsen | |
[client :as client] | |
[checker :as checker] | |
[nemesis :as nemesis] | |
[generator :as gen]] | |
[qbits.alia :as alia] | |
[qbits.alia.policy.retry :as retry] | |
[qbits.hayt :refer :all] | |
[scylla [client :as c]])) | |
(defrecord CQLCounterClient [tbl-created? conn] | |
client/Client | |
(open! [this test node] | |
(assoc this :conn (c/open test node))) | |
(setup! [_ test] | |
(let [s (:session conn)] | |
(locking tbl-created? | |
(when (compare-and-set! tbl-created? false true) | |
(c/retry-each | |
(alia/execute s (create-keyspace | |
:jepsen_keyspace | |
(if-exists false) | |
(with {:replication {:class :SimpleStrategy | |
:replication_factor 3}}))) | |
(alia/execute s (use-keyspace :jepsen_keyspace)) | |
(alia/execute s (create-table | |
:counters | |
(if-exists false) | |
(column-definitions {:id :int | |
:count :counter | |
:primary-key [:id]}) | |
(with {:compaction {:class (:compaction-strategy test)}}))) | |
(alia/execute s (update :counters | |
(set-columns :count [+ 0]) | |
(where [[= :id 0]])) | |
(c/write-opts test))))))) | |
(invoke! [_ _ op] | |
(let [s (:session conn)] | |
(c/with-errors op #{:read} | |
(alia/execute s (use-keyspace :jepsen_keyspace)) | |
(case (:f op) | |
:add (do (alia/execute s | |
(update :counters | |
(set-columns {:count [+ (:value op)]}) | |
(where [[= :id 0]])) | |
(merge {:consistency :one | |
:retry-policy (retry/fallthrough-retry-policy)} | |
(c/write-opts test))) | |
(assoc op :type :ok)) | |
:read (let [value (->> (alia/execute | |
s | |
(select :counters (where [[= :id 0]])) | |
; TODO: do we *really* want ALL ; here? | |
(merge {:consistency :all | |
:retry-policy (retry/fallthrough-retry-policy)} | |
(c/read-opts test))) | |
first | |
:count)] | |
(assoc op :type :ok :value value)))))) | |
(close! [_ _] | |
(c/close! conn)) | |
(teardown! [_ _]) | |
client/Reusable | |
(reusable? [_ _] true)) | |
(defn cql-counter-client | |
"A counter implemented using CQL counters" | |
([] (->CQLCounterClient (atom false) nil))) | |
(defn workload | |
"An increment-only counter workload." | |
[opts] | |
{:client (cql-counter-client) | |
:generator (gen/mix [(repeat {:f :add, :value 1}) | |
(repeat {:f :read})]) | |
:checker (checker/counter)}) |