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Revert "Revert "Add 4-letter command for yielding/resigning leadership""
This reverts commit e1766b96d9
.
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26ab78dbaf
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@ -12,6 +12,7 @@ A client application to interact with clickhouse-keeper by its native protocol.
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- `-q QUERY`, `--query=QUERY` — Query to execute. If this parameter is not passed, `clickhouse-keeper-client` will start in interactive mode.
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- `-h HOST`, `--host=HOST` — Server host. Default value: `localhost`.
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- `-p N`, `--port=N` — Server port. Default value: 9181
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- `-c FILE_PATH`, `--config-file=FILE_PATH` — Set path of config file to get the connection string. Default value: `config.xml`.
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- `--connection-timeout=TIMEOUT` — Set connection timeout in seconds. Default value: 10s.
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- `--session-timeout=TIMEOUT` — Set session timeout in seconds. Default value: 10s.
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- `--operation-timeout=TIMEOUT` — Set operation timeout in seconds. Default value: 10s.
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@ -36,7 +36,7 @@ void CoordinationSettings::loadFromConfig(const String & config_elem, const Poco
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}
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const String KeeperConfigurationAndSettings::DEFAULT_FOUR_LETTER_WORD_CMD = "conf,cons,crst,envi,ruok,srst,srvr,stat,wchs,dirs,mntr,isro,rcvr,apiv,csnp,lgif,rqld,rclc,clrs,ftfl";
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const String KeeperConfigurationAndSettings::DEFAULT_FOUR_LETTER_WORD_CMD = "conf,cons,crst,envi,ruok,srst,srvr,stat,wchs,dirs,mntr,isro,rcvr,apiv,csnp,lgif,rqld,rclc,clrs,ftfl,ydld";
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KeeperConfigurationAndSettings::KeeperConfigurationAndSettings()
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: server_id(NOT_EXIST)
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@ -172,6 +172,9 @@ void FourLetterCommandFactory::registerCommands(KeeperDispatcher & keeper_dispat
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FourLetterCommandPtr feature_flags_command = std::make_shared<FeatureFlagsCommand>(keeper_dispatcher);
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factory.registerCommand(feature_flags_command);
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FourLetterCommandPtr yield_leadership_command = std::make_shared<YieldLeadershipCommand>(keeper_dispatcher);
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factory.registerCommand(yield_leadership_command);
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factory.initializeAllowList(keeper_dispatcher);
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factory.setInitialize(true);
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}
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@ -579,4 +582,10 @@ String FeatureFlagsCommand::run()
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return ret.str();
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}
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String YieldLeadershipCommand::run()
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{
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keeper_dispatcher.yieldLeadership();
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return "Sent yield leadership request to leader.";
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}
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}
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@ -415,4 +415,17 @@ struct FeatureFlagsCommand : public IFourLetterCommand
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~FeatureFlagsCommand() override = default;
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};
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/// Yield leadership and become follower.
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struct YieldLeadershipCommand : public IFourLetterCommand
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{
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explicit YieldLeadershipCommand(KeeperDispatcher & keeper_dispatcher_)
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: IFourLetterCommand(keeper_dispatcher_)
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{
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}
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String name() override { return "ydld"; }
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String run() override;
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~YieldLeadershipCommand() override = default;
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};
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}
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@ -237,6 +237,12 @@ public:
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return server->requestLeader();
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}
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/// Yield leadership and become follower.
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void yieldLeadership()
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{
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return server->yieldLeadership();
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}
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void recalculateStorageStats()
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{
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return server->recalculateStorageStats();
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@ -1101,6 +1101,12 @@ bool KeeperServer::requestLeader()
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return isLeader() || raft_instance->request_leadership();
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}
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void KeeperServer::yieldLeadership()
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{
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if (isLeader())
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raft_instance->yield_leadership();
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}
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void KeeperServer::recalculateStorageStats()
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{
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state_machine->recalculateStorageStats();
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@ -144,6 +144,8 @@ public:
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bool requestLeader();
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void yieldLeadership();
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void recalculateStorageStats();
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};
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@ -248,6 +248,11 @@ def is_leader(cluster, node, port=9181):
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return "Mode: leader" in stat
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def is_follower(cluster, node, port=9181):
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stat = send_4lw_cmd(cluster, node, "stat", port)
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return "Mode: follower" in stat
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def get_leader(cluster, nodes):
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for node in nodes:
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if is_leader(cluster, node):
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@ -725,3 +725,26 @@ def test_cmd_clrs(started_cluster):
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finally:
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destroy_zk_client(zk)
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def test_cmd_ydld(started_cluster):
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wait_nodes()
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for node in [node1, node3]:
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data = keeper_utils.send_4lw_cmd(cluster, node, cmd="ydld")
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assert data == "Sent yield leadership request to leader."
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print("ydld output -------------------------------------")
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print(data)
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if keeper_utils.is_leader(cluster, node):
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# wait for it to yield leadership
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retry = 0
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while keeper_utils.is_leader(cluster, node) and retry < 30:
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time.sleep(1)
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retry += 1
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if retry == 30:
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print(
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node.name
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+ " did not yield leadership after 30s, maybe there is something wrong."
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)
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assert keeper_utils.is_follower(cluster, node)
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