Method acquireMetaLookupPermit

src/RegionClient.java:703–712

Attempts to acquire a permit before performing a META lookup. This method should be called prior to starting a META lookup with #getClosestRowBefore. Whenever it's called we try to acquire a permit from the #meta_lookups semaphore. Because we promised a non-blocking API, we act

()

   * @return {@code true} if a permit was acquired, {@code false} otherwise.
   */
  boolean acquireMetaLookupPermit() {
    try {
      // With such a low timeout, the JVM may chose to spin-wait instead of
      // de-scheduling the thread (and causing context switches and whatnot).
      return meta_lookups.tryAcquire(5, MILLISECONDS);
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();  // Make this someone else's problem.
      return false;
    }
  }

  /**
   * Releases a META lookup permit that was acquired.