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import pytest
import threading
import time

from multiprocessing.pool import ThreadPool

from tests.common.custom_cluster_test_suite import CustomClusterTestSuite

TBL_NAME = "test_concurrent_kudu_create"


class TestConcurrentKuduCreate(CustomClusterTestSuite):
  """Test concurrent create kudu managed table"""

  @pytest.mark.execute_serially
  def test_concurrent_create_kudu_table(self, unique_database):
    table_name = unique_database + "." + TBL_NAME
    test_self = self

    class ThreadLocalClient(threading.local):
      def __init__(self):
        self.client = test_self.create_impala_client()

    tls = ThreadLocalClient()

    def run_create_table_if_not_exists():
      self.execute_query_expect_success(
        tls.client, "create table if not exists %s "
                    "(id int, primary key(id)) stored as kudu" % table_name)
      tls.client.close()

    # Drop table before run test if exists
    self.execute_query("drop table if exists %s" % table_name)
    NUM_ITERS = 20
    for i in xrange(NUM_ITERS):
      # Run several commands by specific time interval to reproduce this bug
      pool = ThreadPool(processes=3)
      r1 = pool.apply_async(run_create_table_if_not_exists)
      r2 = pool.apply_async(run_create_table_if_not_exists)
      # Sleep to make race conflict happens in different places
      time.sleep(1)
      r3 = pool.apply_async(run_create_table_if_not_exists)
      r1.get()
      r2.get()
      r3.get()
      pool.terminate()
      # If hit IMPALA-8984, this query would be failed due to table been deleted in kudu
      self.execute_query_expect_success(tls.client, "select * from %s" % table_name)
      self.execute_query("drop table if exists %s" % table_name)