# MinIO Grid

The MinIO Grid is a package that provides two-way communication between servers.
It uses a single two-way connection to send and receive messages between servers.

It includes built in muxing of concurrent requests as well as congestion handling for streams.

Requests can be "Single Payload" or "Streamed".

Use the MinIO Grid for:

* Small, frequent requests with low latency requirements.

	// works, but only when running one binary at a time.
	// Use a file lock to make sure only one wrapper is running at a time.
	//
	// The lock file is never deleted, to avoid concurrent locks on distinct
	// files with the same path.
	lockName := filepath.Join(os.TempDir(), "go_ios_exec-"+deviceID+".lock")
	lock, err = os.OpenFile(lockName, os.O_CREATE|os.O_RDONLY, 0666)
	if err != nil {
		return 1, err

        } catch (ConfigPropertyNotFoundException e) {
            // Expected exception
            assertTrue(e.getMessage().contains("filter.null"));
        }
    }

    // Test concurrent access
    @Test
    public void test_get_concurrentAccess() throws InterruptedException {
        // Create multiple threads accessing the same property
        final String testKey = "domain.title";

    lateinit var currentThread: Thread

    private val loggerHandler =
      object : Handler() {
        override fun publish(record: LogRecord) {
          // Try to avoid multi threading issues with concurrent requests
          if (Thread.currentThread() != currentThread) {
            return
          }

          // https://timothybasanov.com/2016/05/26/java-pre-master-secret.html

            assertEquals(0, count, "No iterations should occur for empty iterator");
        }, "EmptyIterator should work with manual iteration");
    }

    @Test
    @DisplayName("EmptyIterator should handle concurrent access safely")
    void testConcurrentAccess() throws InterruptedException, CIFSException {
        // Given
        final int threadCount = 10;
        final Thread[] threads = new Thread[threadCount];

	}
	return lockedOpenFile(path, flag, perm, lockType)
}

// LockedOpenFile - initializes a new lock and protects
// the file from concurrent access.
func LockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
	var lockType uint32 = lockFileExclusiveLock
	if flag == syscall.O_RDONLY {

import com.google.common.cache.AbstractCache.StatsCounter;
import com.google.common.collect.ImmutableMap;
import com.google.common.util.concurrent.ExecutionError;
import com.google.common.util.concurrent.UncheckedExecutionException;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.concurrent.GuardedBy;
import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.Collection;

      sink.writeUtf8("bb")
    }
    assertThat(cache["k1"]).isNull()
  }

  @Test
  fun `edit discarded after editor detached with concurrent write`() {
    Assumptions.assumeFalse(windows) // Windows can't have two concurrent editors.

    set("k1", "a", "a")

    // Create an editor, then detach it.
    val editor = cache.edit("k1")!!
    editor.newSink(0).buffer().use { sink ->

import java.util.Queue;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;

	if objectAPI == nil {
		return
	}

	// NB rebalance-start admin API is always coordinated from first pool's
	// first node. The following is required to serialize (the effects of)
	// concurrent rebalance-start commands.
	if ep := globalEndpoints[0].Endpoints[0]; !ep.IsLocal {
		for nodeIdx, proxyEp := range globalProxyEndpoints {
			if proxyEp.Host == ep.Host {