jcamachor commented on a change in pull request #794: HIVE-21884 URL: https://github.com/apache/hive/pull/794#discussion_r332275454
########## File path: ql/src/java/org/apache/hadoop/hive/ql/schq/ScheduledQueryExecutionService.java ########## @@ -0,0 +1,159 @@ +package org.apache.hadoop.hive.ql.schq; + +import java.io.Closeable; +import java.io.IOException; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.TimeUnit; + +import org.apache.hadoop.hive.conf.HiveConf; +import org.apache.hadoop.hive.metastore.api.QueryState; +import org.apache.hadoop.hive.metastore.api.ScheduledQueryPollResponse; +import org.apache.hadoop.hive.metastore.api.ScheduledQueryProgressInfo; +import org.apache.hadoop.hive.ql.DriverFactory; +import org.apache.hadoop.hive.ql.IDriver; +import org.apache.hadoop.hive.ql.processors.CommandProcessorResponse; +import org.apache.hadoop.hive.ql.session.SessionState; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.util.concurrent.ThreadFactoryBuilder; + +public class ScheduledQueryExecutionService implements Closeable { + + private static final Logger LOG = LoggerFactory.getLogger(ScheduledQueryExecutionService.class); + + private ScheduledQueryExecutionContext context; + private ScheduledQueryExecutor worker; + + public static ScheduledQueryExecutionService startScheduledQueryExecutorService(HiveConf conf) { + MetastoreBasedScheduledQueryService qService = new MetastoreBasedScheduledQueryService(conf); + ExecutorService executor = + Executors.newCachedThreadPool( + new ThreadFactoryBuilder().setDaemon(true).setNameFormat("Scheduled Query Thread %d").build()); + ScheduledQueryExecutionContext ctx = new ScheduledQueryExecutionContext(executor, conf, qService); + return new ScheduledQueryExecutionService(ctx); + } + + public ScheduledQueryExecutionService(ScheduledQueryExecutionContext ctx) { + context = ctx; + ctx.executor.submit(worker = new ScheduledQueryExecutor()); + ctx.executor.submit(new ProgressReporter()); + } + + class ScheduledQueryExecutor implements Runnable { + + private ScheduledQueryProgressInfo info; + + @Override + public void run() { + while (true) { + ScheduledQueryPollResponse q = context.schedulerService.scheduledQueryPoll(); + if (q.isSetExecutionId()) { + try{ + processQuery(q); + } catch (Throwable t) { + LOG.error("Unexpected exception during scheduled query processing", t); + } + } else { + try { + Thread.sleep(context.getIdleSleepTime()); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + LOG.info("interrupted"); + break; + } + } + } + } + + QueryState lastState; + public synchronized void reportQueryProgress() { + if (info != null) { + if(lastState == QueryState.FINISHED || lastState == QueryState.ERRORED) { + return; + } + LOG.info("Reporting query progress of {} as {} err:{}", info.getScheduledExecutionId(), info.getState(), + info.getErrorMessage()); + context.schedulerService.scheduledQueryProgress(info); + lastState=info.getState(); + } + } + + private void processQuery(ScheduledQueryPollResponse q) { Review comment: What happens in the following two scenarios with current implementation? 1) A scheduled query is modified while it is being executed. 2) HS2 becomes irresponsive for a certain time, the grab on the lock expires, another HS2 grabs the query execution, the first HS2 comes back to life. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org