TiPocket is a testing toolkit designed to test TiDB, it encapsulates some testing tools which are also suitable for testing other databases.

TiPocket is inspired by jepsen-io/jepsen, a famous library on the distributed system field. TiPocket focuses on stability testing on TiDB, it uses chaos-mesh to inject all-round kinds of nemesis on a TiDB cluster.

Requirements

• TiDB Operator >= v1.1.9

• Chaos Mesh >= v1.1.0

Toolkit

• go-sqlsmith: go-sqlsmith is our Go implementation of sqlsmith, it's a fuzz-testing tool which can generate random MySQL-dialect SQL queries.
• go-elle: Our Go port version of jepsen-io/elle, a general transactional consistency checker for black-box databases.

Nemesis

• random_kill, all_kill, minor_kill, major_kill, kill_tikv_1node_5min, kill_pd_leader_5min: As their name implies, these nemeses inject unavailable in a specified period of time.
• short_kill_tikv_1node, short_kill_pd_leader: Kill selected container, used to inject short duration of unavailable fault.
• partition_one: Isolate single nodes
• scaling: Scale up/down TiDB/PD/TiKV nodes randomly
• shuffle-leader-scheduler/shuffle-region-scheduler/random-merge-scheduler: Just as there name implies
• delay_tikv, delay_pd, errno_tikv, errno_pd, mixed_tikv, mixed_pd: Inject IO-related fault.
• small_skews, subcritical_skews, critical_skews, big_skews, huge_skews: Clock skew, small_skews ~100ms, subcritical_skews ~200ms, critical_skews ~250ms, big_skews ~500ms and huge_skews ~5s.

Create a new case

run make init c=$case, for example:

$ make init c=demo
GO15VENDOREXPERIMENT="1" CGO_ENABLED=1 GOOS= GOARCH=amd64 GO111MODULE=on go build -ldflags '-s -w -X "github.com/pingcap/tipocket/pkg/test-infra/fixture.BuildTS=2021-02-05 07:13:54" -X "github.com/pingcap/tipocket/pkg/test-infra/fixture.BuildHash=a70411f45605864da28a5000aff72a226a1ab27f"'  -o bin/tipocket cmd/tipocket/*.go
bin/tipocket init -c demo
create a new case `demo`: testcase/demo

Debug and Run

If you have a K8s cluster, you can use the below commands to deploy and run the case on a TiDB cluster.

On a K8s cluster

Access directly

make build
export KUBECONFIG=${YOUR_KUBECONFIG_PATH}

# direct connect
bin/${testcase} -namespace=${ns} -hub=docker.io -image-version=nightly -storage-class=local-path

This method can't resolve the k8s cluster network accessing and DNS resolution issues, but it's useful for most cases.

Access by a proxy on k8s cluster

export KUBECONFIG=${YOUR_KUBECONFIG_PATH}
kubectl apply -f hacks/debug/k8s-proxy.yaml -n ${ns}
bin/${testcase} -mysql-proxy=socks5://${a_node_ip}:30080 -namespace=${ns} -hub=docker.io -image-version=nightly -storage-class=local-path

This method overcomes the k8s cluster network accessing problem, but one flaw is retained: DNS resolution, so proxychains-ng is recommended here (if you don't mind to install it: brew install proxychains-ng).

export KUBECONFIG=${YOUR_KUBECONFIG_PATH}
kubectl apply -f hacks/debug/k8s-proxy.yaml -n ${ns}
# edit hacks/debug/proxychains.conf, replace REPLACE_ME_WITH_REAL_NODE_IP with a k8s node ip,
# you can connect to the k8s administrator to get a k8s node ip
proxychains4 -f hacks/debug/proxychains.conf bin/${testcase} -mysql-proxy=socks5://${a_node_ip}:30080 -namespace=${ns} -hub=docker.io -image-version=nightly -storage-class=local-path

On the local environment

Another convenient way we recommend you is using tiup to deploy a cluster on local and use it to debug cases.

• Start a TiDB cluster

tiup playground --kv 3

• Specify that cluster address through -tidb-server -tikv-server and -pd-server

bin/${testcase} -tidb-server 127.0.0.1:4000 

• If a cluster has many service addresses, you can pass a flag multiple times

bin/${testcase} -tikv-server 127.0.0.1:20160 -tikv-server 127.0.0.1:20161

Workloads

TiPocket includes some consistency, isolation and other kinds of tests

Consistency

• bank transfers between rows of a shared table
• pbank check bank accounts using a linearizability checker porcupine
• vbank like bank but cover more TiKV features
• ledger yet another bank test
• rawkv-linearizability rawkv linearizability checker
• tpcc use go-tpc testing consistency

Isolation

• append checks for dependency cycles in transactions using Elle
• register checks for write-read dependency cycles over read-write registers using Elle