[jira] [Created] (HBASE-8720) Only one snapshot region tasks that can run at a time

["binlijin (JIRA)" <ji...@apache.org>]

binlijin created HBASE-8720:
-------------------------------

             Summary: Only one snapshot region tasks that can run at a time
                 Key: HBASE-8720
                 URL: https://issues.apache.org/jira/browse/HBASE-8720
             Project: HBase
          Issue Type: Bug
          Components: snapshots
    Affects Versions: 0.95.0, 0.94.8
            Reporter: binlijin


{code}
    SnapshotSubprocedurePool(String name, Configuration conf) {
      // configure the executor service
      long keepAlive = conf.getLong(
        RegionServerSnapshotManager.SNAPSHOT_TIMEOUT_MILLIS_KEY,
        RegionServerSnapshotManager.SNAPSHOT_TIMEOUT_MILLIS_DEFAULT);
      int threads = conf.getInt(CONCURENT_SNAPSHOT_TASKS_KEY, DEFAULT_CONCURRENT_SNAPSHOT_TASKS);
      this.name = name;
      executor = new ThreadPoolExecutor(1, threads, keepAlive, TimeUnit.MILLISECONDS,
          new LinkedBlockingQueue<Runnable>(), new DaemonThreadFactory("rs("
              + name + ")-snapshot-pool"));
      taskPool = new ExecutorCompletionService<Void>(executor);
    }
{code}
ThreadPoolExecutor： 
corePoolSize：1
maximumPoolSize：3
workQueue：LinkedBlockingQueue，unlimited
so when a new task submit to the ThreadPoolExecutor, if there is a task is running, the new task is queued in the queue, so all snapshot region tasks execute one by one.

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