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https://issues.apache.org/jira/browse/HIVE-24723?focusedWorklogId=547138&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-547138
 ]

ASF GitHub Bot logged work on HIVE-24723:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Feb/21 17:16
            Start Date: 03/Feb/21 17:16
    Worklog Time Spent: 10m 
      Work Description: belugabehr commented on a change in pull request #1939:
URL: https://github.com/apache/hive/pull/1939#discussion_r569594294



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezSessionPool.java
##########
@@ -395,20 +379,38 @@ int getInitialSize() {
     } while (!deltaRemaining.compareAndSet(oldVal, oldVal + delta));
     int toStart = oldVal + delta;
     if (toStart <= 0) return createDummyFuture();
-    LOG.info("Resizing the pool; adding " + toStart + " sessions");
-
-    // 2) If we need to create some extra sessions, we'd do it just like 
startup does.
-    int threadCount = Math.max(1, Math.min(toStart,
-        HiveConf.getIntVar(initConf, 
ConfVars.HIVE_SERVER2_TEZ_SESSION_MAX_INIT_THREADS)));
-    List<ListenableFutureTask<Boolean>> threadTasks = new 
ArrayList<>(threadCount);
-    // This is an async method, so always launch threads, even for a single 
task.
-    for (int i = 0; i < threadCount; ++i) {
-      ListenableFutureTask<Boolean> task = ListenableFutureTask.create(
-          new CreateSessionsRunnable(deltaRemaining));
-      new Thread(task, "Tez pool resize " + i).start();
-      threadTasks.add(task);
+    LOG.info("Resizing the pool; adding {} sessions", toStart);
+
+    final int threadCount =
+        Math.min(toStart, HiveConf.getIntVar(initConf, 
ConfVars.HIVE_SERVER2_TEZ_SESSION_MAX_INIT_THREADS));

Review comment:
       I would advise against that.  The first one initialized the pool, the 
second one is to increase the existing pool.  I think the naming is OK.

##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezSessionPool.java
##########
@@ -395,20 +379,38 @@ int getInitialSize() {
     } while (!deltaRemaining.compareAndSet(oldVal, oldVal + delta));
     int toStart = oldVal + delta;
     if (toStart <= 0) return createDummyFuture();
-    LOG.info("Resizing the pool; adding " + toStart + " sessions");
-
-    // 2) If we need to create some extra sessions, we'd do it just like 
startup does.
-    int threadCount = Math.max(1, Math.min(toStart,
-        HiveConf.getIntVar(initConf, 
ConfVars.HIVE_SERVER2_TEZ_SESSION_MAX_INIT_THREADS)));
-    List<ListenableFutureTask<Boolean>> threadTasks = new 
ArrayList<>(threadCount);
-    // This is an async method, so always launch threads, even for a single 
task.
-    for (int i = 0; i < threadCount; ++i) {
-      ListenableFutureTask<Boolean> task = ListenableFutureTask.create(
-          new CreateSessionsRunnable(deltaRemaining));
-      new Thread(task, "Tez pool resize " + i).start();
-      threadTasks.add(task);
+    LOG.info("Resizing the pool; adding {} sessions", toStart);
+
+    final int threadCount =
+        Math.min(toStart, HiveConf.getIntVar(initConf, 
ConfVars.HIVE_SERVER2_TEZ_SESSION_MAX_INIT_THREADS));
+
+    return createSessions(toStart, threadCount);
+  }
+
+  private ListenableFuture<List<Boolean>> createSessions(int sessionCount, int 
maxParallel) {

Review comment:
       Sure




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 547138)
    Time Spent: 1h 10m  (was: 1h)

> Use ExecutorService in TezSessionPool
> -------------------------------------
>
>                 Key: HIVE-24723
>                 URL: https://issues.apache.org/jira/browse/HIVE-24723
>             Project: Hive
>          Issue Type: Improvement
>          Components: Tez
>            Reporter: David Mollitor
>            Assignee: David Mollitor
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Currently there are some wonky home-made thread pooling action going on in 
> {{TezSessionPool}}.  Replace it with some JDK/Guava goodness.



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