/// <exception cref="System.Exception"/>
public virtual void TestAllocateSlots()
{
FilePath path = new FilePath(TestBase, "testAllocateSlots");
path.Mkdirs();
SharedFileDescriptorFactory factory = SharedFileDescriptorFactory.Create("shm_",
new string[] { path.GetAbsolutePath() });
FileInputStream stream = factory.CreateDescriptor("testAllocateSlots", 4096);
ShortCircuitShm shm = new ShortCircuitShm(ShortCircuitShm.ShmId.CreateRandom(), stream
);
int numSlots = 0;
AList <ShortCircuitShm.Slot> slots = new AList <ShortCircuitShm.Slot>();
while (!shm.IsFull())
{
ShortCircuitShm.Slot slot = shm.AllocAndRegisterSlot(new ExtendedBlockId(123L, "test_bp1"
));
slots.AddItem(slot);
numSlots++;
}
Log.Info("allocated " + numSlots + " slots before running out.");
int slotIdx = 0;
for (IEnumerator <ShortCircuitShm.Slot> iter = shm.SlotIterator(); iter.HasNext();)
{
NUnit.Framework.Assert.IsTrue(slots.Contains(iter.Next()));
}
foreach (ShortCircuitShm.Slot slot_1 in slots)
{
NUnit.Framework.Assert.IsFalse(slot_1.AddAnchor());
NUnit.Framework.Assert.AreEqual(slotIdx++, slot_1.GetSlotIdx());
}
foreach (ShortCircuitShm.Slot slot_2 in slots)
{
slot_2.MakeAnchorable();
}
foreach (ShortCircuitShm.Slot slot_3 in slots)
{
NUnit.Framework.Assert.IsTrue(slot_3.AddAnchor());
}
foreach (ShortCircuitShm.Slot slot_4 in slots)
{
slot_4.RemoveAnchor();
}
foreach (ShortCircuitShm.Slot slot_5 in slots)
{
shm.UnregisterSlot(slot_5.GetSlotIdx());
slot_5.MakeInvalid();
}
shm.Free();
stream.Close();
FileUtil.FullyDelete(path);
}
/// <exception cref="System.IO.IOException"/>
public ShortCircuitRegistry(Configuration conf)
{
bool enabled = false;
SharedFileDescriptorFactory shmFactory = null;
DomainSocketWatcher watcher = null;
try
{
int interruptCheck = conf.GetInt(DFSConfigKeys.DfsShortCircuitSharedMemoryWatcherInterruptCheckMs
, DFSConfigKeys.DfsShortCircuitSharedMemoryWatcherInterruptCheckMsDefault);
if (interruptCheck <= 0)
{
throw new IOException(DFSConfigKeys.DfsShortCircuitSharedMemoryWatcherInterruptCheckMs
+ " was set to " + interruptCheck);
}
string[] shmPaths = conf.GetTrimmedStrings(DFSConfigKeys.DfsDatanodeSharedFileDescriptorPaths
);
if (shmPaths.Length == 0)
{
shmPaths = DFSConfigKeys.DfsDatanodeSharedFileDescriptorPathsDefault.Split(",");
}
shmFactory = SharedFileDescriptorFactory.Create("HadoopShortCircuitShm_", shmPaths
);
string dswLoadingFailure = DomainSocketWatcher.GetLoadingFailureReason();
if (dswLoadingFailure != null)
{
throw new IOException(dswLoadingFailure);
}
watcher = new DomainSocketWatcher(interruptCheck, "datanode");
enabled = true;
if (Log.IsDebugEnabled())
{
Log.Debug("created new ShortCircuitRegistry with interruptCheck=" + interruptCheck
+ ", shmPath=" + shmFactory.GetPath());
}
}
catch (IOException e)
{
if (Log.IsDebugEnabled())
{
Log.Debug("Disabling ShortCircuitRegistry", e);
}
}
finally
{
this.enabled = enabled;
this.shmFactory = shmFactory;
this.watcher = watcher;
}
}
/// <exception cref="System.Exception"/>
public virtual void TestStartupShutdown()
{
FilePath path = new FilePath(TestBase, "testStartupShutdown");
path.Mkdirs();
SharedFileDescriptorFactory factory = SharedFileDescriptorFactory.Create("shm_",
new string[] { path.GetAbsolutePath() });
FileInputStream stream = factory.CreateDescriptor("testStartupShutdown", 4096);
ShortCircuitShm shm = new ShortCircuitShm(ShortCircuitShm.ShmId.CreateRandom(), stream
);
shm.Free();
stream.Close();
FileUtil.FullyDelete(path);
}