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Merge pull request #177 from wl-net/add-zookeeper-cluster-mgmt
Add preliminary replacement for Cassandra service management
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192 changes: 192 additions & 0 deletions
192
...cus-lib/src/main/java/com/iris/platform/cluster/zookeeper/ZookeeperClusterServiceDao.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,192 @@ | ||
| /* | ||
| * Copyright 2020 Arcus Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.iris.platform.cluster.zookeeper; | ||
|
|
||
| import com.codahale.metrics.Counter; | ||
| import com.codahale.metrics.Timer; | ||
| import com.google.gson.Gson; | ||
| import com.google.inject.Inject; | ||
| import com.google.inject.name.Named; | ||
| import com.iris.core.IrisApplicationModule; | ||
| import com.iris.core.dao.metrics.DaoMetrics; | ||
| import com.iris.info.IrisApplicationInfo; | ||
| import com.iris.platform.cluster.ClusterConfig; | ||
| import com.iris.platform.cluster.ClusterServiceDao; | ||
| import com.iris.platform.cluster.ClusterServiceRecord; | ||
| import com.iris.platform.cluster.exception.ClusterIdUnavailableException; | ||
| import com.iris.platform.cluster.exception.ClusterServiceDaoException; | ||
| import com.iris.platform.partition.PartitionConfig; | ||
| import org.apache.zookeeper.*; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import java.io.IOException; | ||
| import java.time.Clock; | ||
| import java.time.Instant; | ||
| import java.util.ArrayList; | ||
| import java.util.Comparator; | ||
| import java.util.Date; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| public class ZookeeperClusterServiceDao implements ClusterServiceDao, Watcher { | ||
| private static final Logger logger = LoggerFactory.getLogger(ZookeeperClusterServiceDao.class); | ||
|
|
||
| private final Clock clock; | ||
| private final ZooKeeper zk; | ||
| private final ZookeeperMonitor monitor; | ||
| private final String service; | ||
| private final int members; | ||
| private final String host; | ||
| private final String zkPathPrefix; | ||
|
|
||
| private final Gson gson; | ||
|
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||
| @Inject | ||
| public ZookeeperClusterServiceDao( | ||
| Clock clock, | ||
| PartitionConfig config, | ||
| ClusterConfig clusterConfig, | ||
| @Named(IrisApplicationModule.NAME_APPLICATION_NAME) String service) throws IOException { | ||
| this.clock = clock; | ||
| this.zk = new ZooKeeper(clusterConfig.getClusterZkHost(), clusterConfig.getClusterZkTimeout(), this); | ||
| this.members = config.getMembers(); | ||
| this.host = IrisApplicationInfo.getHostName(); | ||
| this.service = service; | ||
| this.gson = new Gson(); | ||
| this.monitor = new ZookeeperMonitor(zk); | ||
|
|
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| this.zkPathPrefix = clusterConfig.getClusterZkPathPrefix(); | ||
| } | ||
|
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| @Override | ||
| public ClusterServiceRecord register() throws ClusterIdUnavailableException { | ||
| List<Integer> others = | ||
| listMembersByService(service) | ||
| .stream() | ||
| .sorted(Comparator.comparing(ClusterServiceRecord::getLastHeartbeat)) | ||
| .map(ClusterServiceRecord::getMemberId) | ||
| .collect(Collectors.toList()); | ||
| try (Timer.Context timer = ZookeeperClusterServiceDao.ClusterServiceMetrics.registerTimer.time()) { | ||
| Instant heartbeat = clock.instant(); | ||
| // grab an empty cluster id, or wait | ||
| for (int i = 0; i < members; i++) { | ||
| if (others.contains(i)) { | ||
| continue; | ||
| } | ||
|
|
||
| int memberId = i; | ||
| ClusterServiceRecord csr = tryInsert(memberId, heartbeat); | ||
| if (csr != null) { | ||
| return csr; | ||
| } else { | ||
| ZookeeperClusterServiceDao.ClusterServiceMetrics.clusterRegistrationMissCounter.inc(); | ||
| } | ||
| } | ||
|
|
||
| ZookeeperClusterServiceDao.ClusterServiceMetrics.clusterRegistrationFailedCounter.inc(); | ||
| throw new ClusterIdUnavailableException("No cluster ids for service [" + service + "] were available"); | ||
| } | ||
| } | ||
|
|
||
| private ClusterServiceRecord tryInsert(int memberId, Instant heartbeat) { | ||
| Date ts = new Date(heartbeat.toEpochMilli()); | ||
| ClusterServiceRecord csr = new ClusterServiceRecord(); | ||
| csr.setHost(host); | ||
| csr.setRegistered(ts.toInstant()); | ||
| csr.setLastHeartbeat(ts.toInstant()); | ||
| csr.setService(service); | ||
| csr.setMemberId(memberId); | ||
|
|
||
| try { | ||
| zk.create(zkPathPrefix + service + '/' + memberId, gson.toJson(csr).getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL); | ||
| return csr; | ||
| } catch (KeeperException e) { | ||
| logger.info("Creating path in zookeeper for {} ", service); | ||
| if (e.code() == KeeperException.Code.NONODE) { | ||
| try { | ||
| zk.create(zkPathPrefix + service, null, ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); | ||
| } catch(KeeperException | InterruptedException e1) { | ||
| logger.error("Failed to create path for service", e1); | ||
| return null; | ||
| } | ||
| } | ||
| } catch (InterruptedException e) { | ||
| logger.error("Failed to write to zk", e); | ||
| return null; | ||
| } | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public ClusterServiceRecord heartbeat(ClusterServiceRecord service) throws ClusterServiceDaoException { | ||
| // Not required for this implementation - ZooKeeper will automatically expire ephemeral nodes. | ||
| return null; | ||
| } | ||
|
|
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| @Override | ||
| public boolean deregister(ClusterServiceRecord record) { | ||
| return false; | ||
| } | ||
|
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| @Override | ||
| public List<ClusterServiceRecord> listMembersByService(String service) { | ||
| List<ClusterServiceRecord> records = new ArrayList<ClusterServiceRecord>(); | ||
| try(Timer.Context timer = ZookeeperClusterServiceDao.ClusterServiceMetrics.listByServiceTimer.time()) { | ||
| List<String> children = zk.getChildren(zkPathPrefix + service, false); | ||
|
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| for (String child: children) { | ||
| ClusterServiceRecord record = transform(zk.getData(zkPathPrefix + service + '/' + child, false, null)); | ||
| if (record != null) { | ||
| records.add(record); | ||
| } | ||
| } | ||
| } catch (InterruptedException e) { | ||
| // ignore | ||
| } catch (KeeperException e) { | ||
| if (e.code() == KeeperException.Code.NONODE) { | ||
| logger.info("{} hasn't been registered in zookeeper before, will need to be created", service); | ||
| } else { | ||
| logger.warn("Failed to list members of service", e); | ||
| } | ||
| if (e.code() == KeeperException.Code.CONNECTIONLOSS) { | ||
| logger.info("Unable to communicate with zookeeper {}", e.getMessage()); | ||
| } | ||
| } | ||
|
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| return records; | ||
| } | ||
|
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| private ClusterServiceRecord transform(byte[] zkdata) { | ||
| ClusterServiceRecord record = gson.fromJson(new String(zkdata), ClusterServiceRecord.class); | ||
| return record; | ||
| } | ||
|
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| @Override | ||
| public void process(WatchedEvent event) { | ||
| monitor.process(event); | ||
| } | ||
|
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| private static class ClusterServiceMetrics { | ||
| static final Timer registerTimer = DaoMetrics.upsertTimer(ClusterServiceDao.class, "register"); | ||
| static final Timer deregisterTimer = DaoMetrics.deleteTimer(ClusterServiceDao.class, "deregister"); | ||
| static final Timer listByServiceTimer = DaoMetrics.readTimer(ClusterServiceDao.class, "listMembersByService"); | ||
| static final Counter clusterIdRegisteredCounter = DaoMetrics.counter(ClusterServiceDao.class, "clusterid.registered"); | ||
| static final Counter clusterIdLostCounter = DaoMetrics.counter(ClusterServiceDao.class, "clusterid.lost"); | ||
| static final Counter clusterRegistrationMissCounter = DaoMetrics.counter(ClusterServiceDao.class, "clusterregistration.collision"); | ||
| static final Counter clusterRegistrationFailedCounter = DaoMetrics.counter(ClusterServiceDao.class, "clusterregistration.failed"); | ||
| } | ||
| } |
56 changes: 56 additions & 0 deletions
56
platform/arcus-lib/src/main/java/com/iris/platform/cluster/zookeeper/ZookeeperMonitor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * Copyright 2020 Arcus Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.iris.platform.cluster.zookeeper; | ||
|
|
||
| import org.apache.zookeeper.WatchedEvent; | ||
| import org.apache.zookeeper.Watcher; | ||
| import org.apache.zookeeper.ZooKeeper; | ||
| import org.apache.zookeeper.AsyncCallback.StatCallback; | ||
| import org.apache.zookeeper.data.Stat; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| public class ZookeeperMonitor implements Watcher, StatCallback { | ||
| private static final Logger logger = LoggerFactory.getLogger(ZookeeperMonitor.class); | ||
|
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| private final ZooKeeper zk; | ||
|
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| public ZookeeperMonitor(ZooKeeper zk) { | ||
| this.zk = zk; | ||
| } | ||
|
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| @Override | ||
| public void process(WatchedEvent event) { | ||
| if (event.getType() == Event.EventType.None) { | ||
| switch (event.getState()) { | ||
| case SyncConnected: | ||
| break; | ||
| case Expired: | ||
| // TODO: move this elsewhere? | ||
| logger.error("SHUTTING DOWN -- zookeeper session has been marked as expired"); | ||
| System.err.println("SHUTTING DOWN -- zookeeper session has been marked as expired"); | ||
| System.exit(-1); | ||
|
|
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| break; | ||
| } | ||
| } else { | ||
|
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| } | ||
| } | ||
|
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| public void processResult(int rc, String path, Object ctx, Stat stat) { | ||
| } | ||
| } |