Java tutorial
/* Copyright 2014 Twitter, Inc. 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.twitter.ambrose.service.impl.hraven; import java.io.IOException; import java.util.Map; import java.util.Properties; import java.util.Set; import java.util.UUID; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.apache.commons.lang.StringUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HConstants; import org.apache.hadoop.hbase.zookeeper.ZKUtil; import org.apache.hadoop.mapred.JobConf; import com.google.common.base.Preconditions; import com.google.common.collect.Sets; import com.twitter.ambrose.model.DAGNode; import com.twitter.ambrose.model.Event; import com.twitter.ambrose.model.Job; import com.twitter.ambrose.model.WorkflowId; import com.twitter.ambrose.model.hadoop.MapReduceHelper; import com.twitter.ambrose.service.StatsWriteService; import com.twitter.ambrose.util.JSONUtil; import com.twitter.hraven.Constants; import com.twitter.hraven.Flow; import com.twitter.hraven.FlowEvent; import com.twitter.hraven.FlowEventKey; import com.twitter.hraven.FlowKey; import com.twitter.hraven.FlowQueueKey; import com.twitter.hraven.JobDescFactory; import com.twitter.hraven.JobDescFactoryBase; import com.twitter.hraven.datasource.FlowEventService; import com.twitter.hraven.datasource.FlowQueueService; import com.twitter.hraven.util.StringUtil; /** * StatsWriteService to persist job statistics- DAG and events to hraven * hraven has FlowQueueService and FlowEventService to store job related information * and real time stats respectively. Data is persisted by writing directly to hraven's HBase backend. * HRavenStatsReadService can be used to read the DAG and events back from hraven * to display them on a hosted dashboard. * * An instance of HRavenStatsWriteService corresponds to one hraven flow (it's not stateless). * Flow id is derived from jobConf passed to the constructor. * Hence, workflowId parameter in sendDagNodeNameMap and pushEvent api is ignored. * TODO separate out this into another interface to make service stateless * * HRavenStatsWriteService persists data directly to HRaven's HBase backend. * Configuration keys for hRaven HBase storage * We construct an HBase configuration to use for the hRaven client using the following logic: * 1) if the HRAVEN_HBASE_CONF_DIR environment variable is set, we construct a Configuration * object and add the file $HRAVEN_HBASE_CONF_DIR/hbase-site.xml * 2) otherwise, we look in the job configuration for a property named * "hraven.hbase.zookeeper.quorum", (in the format * "quorum peer hostname1[,quorum peer host2,...]:client port:parent znode"). If found, this * value is split and applied to the HBase configuration. */ @SuppressWarnings("rawtypes") public class HRavenStatsWriteService implements StatsWriteService { private static final Log LOG = LogFactory.getLog(HRavenStatsWriteService.class); private final String username; private final Set<String> runningJobs; private final Set<String> completedJobs; private final Set<String> failedJobs; private final ExecutorService hRavenPool; private volatile boolean initialized = false; private FlowQueueService flowQueueService; private FlowEventService flowEventService; private String cluster; private String appId; private FlowKey flowKey; private FlowQueueKey flowQueueKey; private Map<String, DAGNode<Job>> dagNodeNameMap; private JobConf jobConf; private static final int HRAVEN_POOL_SHUTDOWN_SECS = 5; /** Environment variable pointing to the configuration directory to use with hRaven */ public static final String HRAVEN_HBASE_CONF_DIR_ENV = "HRAVEN_HBASE_CONF_DIR"; /** Filename to load the HBase configuration from */ public static final String HRAVEN_HBASE_CONF_FILE = "hbase-site.xml"; /** Connection information for the hRaven HBase zookeeper quorum, * ("quorum peer hostname1[,quorum peer host2,...]:client port:parent znode"). */ public static final String HRAVEN_ZOOKEEPER_QUORUM = "hraven." + HConstants.ZOOKEEPER_QUORUM; public HRavenStatsWriteService() { this.runningJobs = Sets.newHashSet(); this.completedJobs = Sets.newHashSet(); this.failedJobs = Sets.newHashSet(); this.username = System.getProperty("user.name"); // queue hRaven requests up and fire them asynchronously this.hRavenPool = Executors.newFixedThreadPool(1); // we try to shut down gracefully, but this exists if we can't Runtime.getRuntime().addShutdownHook(new Thread() { @Override public void run() { shutdown(); } }); } static Configuration initHBaseConfiguration(Configuration jobConf) { // setup hraven hbase connection information Configuration hbaseConf = null; String hravenDir = System.getenv(HRAVEN_HBASE_CONF_DIR_ENV); if (hravenDir != null && !hravenDir.isEmpty()) { hbaseConf = new Configuration(false); Path hbaseConfFile = new Path(hravenDir, HRAVEN_HBASE_CONF_FILE); LOG.info("Loading hRaven HBase configuration from " + hbaseConfFile.toString()); hbaseConf.addResource(hbaseConfFile); } else { hbaseConf = HBaseConfiguration.create(); // override any hRaven connection properties from the job String hbaseZKQuorum = jobConf.get(HRAVEN_ZOOKEEPER_QUORUM); if (hbaseZKQuorum != null && !hbaseZKQuorum.isEmpty()) { try { LOG.info("Applying hRaven Zookeeper quorum information from job conf: " + hbaseZKQuorum); ZKUtil.applyClusterKeyToConf(hbaseConf, hbaseZKQuorum); } catch (IOException ioe) { throw new RuntimeException("Invalid cluster configuration for " + HRAVEN_ZOOKEEPER_QUORUM + " (\"" + hbaseZKQuorum + "\")"); } } else if (LOG.isDebugEnabled()) { LOG.debug("No cluster configuration found for " + HRAVEN_ZOOKEEPER_QUORUM + ", continuing with default"); } } return hbaseConf; } private static final class HRavenEventRunnable implements Runnable { private final FlowEventService flowEventService; private final FlowEvent flowEvent; private HRavenEventRunnable(FlowEventService flowEventService, FlowEvent flowEvent) { this.flowEventService = flowEventService; this.flowEvent = flowEvent; } @Override public void run() { try { LOG.info("Submitting flowEvent to hRaven: " + flowEvent.getFlowEventKey().getSequence()); flowEventService.addEvent(flowEvent); } catch (Exception e) { LOG.warn("Error making request to HRaven FlowEventService for event flowEventKey: " + flowEvent.getFlowEventKey(), e); } } } private final class HRavenQueueRunnable implements Runnable { private final FlowQueueService flowQueueService; private final FlowQueueKey flowQueueKey; private final FlowQueueKey newQueueKey; private final Flow flow; private HRavenQueueRunnable(FlowQueueService flowQueueService, FlowQueueKey flowQueueKey, Flow flow) { this.flowQueueService = flowQueueService; this.flowQueueKey = flowQueueKey; this.flow = flow; this.newQueueKey = null; } private HRavenQueueRunnable(FlowQueueService flowQueueService, FlowQueueKey flowQueueKey, FlowQueueKey newQueueKey) { this.flowQueueService = flowQueueService; this.flowQueueKey = flowQueueKey; this.newQueueKey = newQueueKey; this.flow = null; } @Override public void run() { try { if (flow != null) { LOG.debug("Submitting update to flowQueue to hRaven: " + flowQueueKey.getFlowId()); flowQueueService.updateFlow(flowQueueKey, flow); LOG.debug("Submitted update to flowQueue to hRaven: " + flowQueueKey.getFlowId()); } else if (newQueueKey != null) { LOG.info(String.format("Submitting request to hRaven to move flowQueueKey from %s to %s", flowQueueKey != null ? flowQueueKey : "", newQueueKey)); flowQueueService.moveFlow(flowQueueKey, newQueueKey); LOG.info(String.format("Submitted request to hRaven to move flowQueueKey from %s to %s", flowQueueKey != null ? flowQueueKey : "", newQueueKey)); } else { LOG.warn("Can not make request to flowQueueService since it is not clear if this is an " + "update or a move, since both flow and newQueueKey are null"); } } catch (Exception e) { LOG.error("Error making request to HRaven FlowQueueService for flowQueueKey: " + flowQueueKey, e); } } } /** * Check if all the Set and Map used to track the flow is initialized. * @return boolean variable to indicate that the variables are all initialized. */ private boolean ifInitialized() { return runningJobs != null && completedJobs != null && failedJobs != null && dagNodeNameMap != null; } public void shutdown() { if (ifInitialized() && (runningJobs.size() > 0 || completedJobs.size() + failedJobs.size() < dagNodeNameMap.size())) { try { changeFlowQueueStatus(Flow.Status.FAILED); } catch (IOException e) { LOG.error("Couldn't change queue status to failed", e); } } hRavenPool.shutdown(); try { LOG.info(String.format("Waiting for up to %d seconds for any pending hRavenPool requests to complete", HRAVEN_POOL_SHUTDOWN_SECS)); hRavenPool.awaitTermination(HRAVEN_POOL_SHUTDOWN_SECS, TimeUnit.SECONDS); } catch (InterruptedException e) { LOG.error("Was not able to await termination for hRavenPool", e); } } private void changeFlowQueueStatus(Flow.Status status) throws IOException { LOG.info(String.format("Changing flowQueueStatus from %s to %s", flowQueueKey.getStatus(), status)); FlowQueueKey newQueueKey = new FlowQueueKey(flowQueueKey.getCluster(), status, flowQueueKey.getTimestamp(), flowQueueKey.getFlowId()); hRavenPool.submit(new HRavenQueueRunnable(flowQueueService, flowQueueKey, newQueueKey)); flowQueueKey = newQueueKey; } @Override public void initWriteService(Properties properties) throws IOException { if (initialized) { return; } jobConf = new JobConf(MapReduceHelper.toConfiguration(properties)); // setup hraven hbase connection information Configuration hbaseConf = initHBaseConfiguration(jobConf); try { flowQueueService = new FlowQueueService(hbaseConf); } catch (IOException e) { throw new RuntimeException("Could not instantiate hRaven FlowQueueService", e); } try { flowEventService = new FlowEventService(hbaseConf); } catch (IOException e) { throw new RuntimeException("Could not instantiate hRaven FlowEventService", e); } // make sure hRavenClusters.properties file is on the classpath // this file stores mapping between jobtracker host and cluster name cluster = JobDescFactory.getCluster(jobConf); if (cluster == null) { cluster = "default"; } // This will return appid for pig, cascading consistent with hraven (only available in 0.9.13+) appId = JobDescFactory.getFrameworkSpecificJobDescFactory(jobConf).getAppId(jobConf); // TODO Remove this: Temporary fix for adhoc pig jobs if (StringUtils.isBlank(appId)) { appId = jobConf.get("jobName"); if (appId != null) { Matcher matcher = Pattern.compile(Constants.PIG_SCHEDULED_JOBNAME_PATTERN_REGEX).matcher(appId); if (matcher.matches()) { appId = matcher.group(1); } } else { appId = "Unknown_" + UUID.randomUUID(); } } flowKey = new FlowKey(cluster, username, appId, System.currentTimeMillis()); // create a new flow queue entry UUID uuid = UUID.randomUUID(); flowQueueKey = new FlowQueueKey(cluster, Flow.Status.RUNNING, System.currentTimeMillis(), uuid.toString()); initialized = true; } /** * get hraven workflow id corresponding to this instance of StatsWriteService. * Useful for logging url of the workflow dashboard. * @return hraven workflow id for the stats write service */ public String getWorkflowId() { if (!initialized) { return null; } // initialized is true only if flowKey and flowQueueKey are initialized WorkflowId workflowId = new WorkflowId(cluster, username, appId, flowKey.getRunId(), flowQueueKey.getTimestamp(), flowQueueKey.getFlowId()); return workflowId.toId(); } @Override public void sendDagNodeNameMap(String workflowId, Map dagNodeMap) throws IOException { Preconditions.checkNotNull(dagNodeMap); this.dagNodeNameMap = dagNodeMap; updateFlowQueue(flowQueueKey); } @SuppressWarnings("unchecked") @Override public void pushEvent(String workflowId, Event event) throws IOException { String eventDataJson = event.toJson(); switch (event.getType()) { case WORKFLOW_PROGRESS: updateWorkflowProgress((Map<Event.WorkflowProgressField, String>) event.getPayload()); break; case JOB_STARTED: updateJobStarted((DAGNode) event.getPayload()); break; case JOB_FAILED: case JOB_FINISHED: updateJobComplete((DAGNode) event.getPayload(), event.getType()); break; default: break; } Preconditions.checkNotNull(flowKey, String.format("Can not push event type %s because flowKey is not set", event.getType())); FlowEventKey eventKey = new FlowEventKey(flowKey, event.getId()); FlowEvent flowEvent = new FlowEvent(eventKey); flowEvent.setTimestamp(event.getTimestamp()); flowEvent.setFramework(JobDescFactory.getFramework(jobConf)); flowEvent.setType(event.getType().name()); if (eventDataJson != null) { flowEvent.setEventDataJSON(eventDataJson); } hRavenPool.submit(new HRavenEventRunnable(flowEventService, flowEvent)); } private void updateFlowQueue(FlowQueueKey key) throws IOException { updateFlowQueue(key, null); } private void updateFlowQueue(FlowQueueKey key, Integer progress) throws IOException { Flow flow = new Flow(flowKey); if (progress != null) { flow.setProgress(progress); } flow.setQueueKey(key); flow.setFlowName(appId); flow.setUserName(username); flow.setJobGraphJSON(JSONUtil.toJson(dagNodeNameMap)); hRavenPool.submit(new HRavenQueueRunnable(flowQueueService, flowQueueKey, flow)); } private void updateWorkflowProgress(Map<Event.WorkflowProgressField, String> progressMap) throws IOException { int progress = Integer.parseInt(progressMap.get(Event.WorkflowProgressField.workflowProgress)); if (progress == 100) { updateWorkflowStateIfDone(); } updateFlowQueue(flowQueueKey, progress); } private String updateJobStarted(DAGNode node) throws IOException { runningJobs.add(node.getJob().getId()); return node.toJson(); } private void updateJobComplete(DAGNode node, Event.Type eventType) throws IOException { String jobId = node.getJob().getId(); switch (eventType) { case JOB_FINISHED: runningJobs.remove(jobId); completedJobs.add(jobId); break; case JOB_FAILED: runningJobs.remove(jobId); failedJobs.add(jobId); break; default: throw new IllegalArgumentException("Unrecognized Event type in updateJobInfo: " + eventType); } updateWorkflowStateIfDone(); } private void updateWorkflowStateIfDone() throws IOException { // see if we're done or not. We're done if no jobs are running and the sum of completed jobs // is the size of the DAG if (runningJobs.size() > 0 || dagNodeNameMap.size() == 0 || (completedJobs.size() + failedJobs.size() != dagNodeNameMap.size())) { return; } LOG.info(String.format("Ambrose total jobs: %d, succeeded: %d, failed: %d", dagNodeNameMap.size(), completedJobs.size(), failedJobs.size())); if (failedJobs.size() > 0) { //change queue state to failed changeFlowQueueStatus(Flow.Status.FAILED); } else { //change queue state to succeeded changeFlowQueueStatus(Flow.Status.SUCCEEDED); } } }