Java Slot.makeInvalid方法代码示例

import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitShm.Slot; //导入方法依赖的package包/类
public synchronized void removeShm(ShortCircuitShm shm) {
  if (LOG.isTraceEnabled()) {
    LOG.debug("removing shm " + shm);
  }
  // Stop tracking the shmId.
  RegisteredShm removedShm = segments.remove(shm.getShmId());
  Preconditions.checkState(removedShm == shm,
      "failed to remove " + shm.getShmId());
  // Stop tracking the slots.
  for (Iterator<Slot> iter = shm.slotIterator(); iter.hasNext(); ) {
    Slot slot = iter.next();
    boolean removed = slots.remove(slot.getBlockId(), slot);
    Preconditions.checkState(removed);
    slot.makeInvalid();
  }
  // De-allocate the memory map and close the shared file. 
  shm.free();
}
 

import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitShm.Slot; //导入方法依赖的package包/类
/**
 * Invalidate any slot associated with a blockId that we are invalidating
 * (deleting) from this DataNode.  When a slot is invalid, the DFSClient will
 * not use the corresponding replica for new read or mmap operations (although
 * existing, ongoing read or mmap operations will complete.)
 *
 * @param blockId        The block ID.
 */
public synchronized void processBlockInvalidation(ExtendedBlockId blockId) {
  if (!enabled) return;
  final Set<Slot> affectedSlots = slots.get(blockId);
  if (!affectedSlots.isEmpty()) {
    final StringBuilder bld = new StringBuilder();
    String prefix = "";
    bld.append("Block ").append(blockId).append(" has been invalidated.  ").
        append("Marking short-circuit slots as invalid: ");
    for (Slot slot : affectedSlots) {
      slot.makeInvalid();
      bld.append(prefix).append(slot.toString());
      prefix = ", ";
    }
    LOG.info(bld.toString());
  }
}
 

import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitShm.Slot; //导入方法依赖的package包/类
public synchronized void unregisterSlot(SlotId slotId)
    throws InvalidRequestException {
  if (!enabled) {
    if (LOG.isTraceEnabled()) {
      LOG.trace("unregisterSlot: ShortCircuitRegistry is " +
          "not enabled.");
    }
    throw new UnsupportedOperationException();
  }
  ShmId shmId = slotId.getShmId();
  RegisteredShm shm = segments.get(shmId);
  if (shm == null) {
    throw new InvalidRequestException("there is no shared memory segment " +
        "registered with shmId " + shmId);
  }
  Slot slot = shm.getSlot(slotId.getSlotIdx());
  slot.makeInvalid();
  shm.unregisterSlot(slotId.getSlotIdx());
  slots.remove(slot.getBlockId(), slot);
}
 

import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitShm.Slot; //导入方法依赖的package包/类
/**
 * Free a slot immediately.
 *
 * ONLY use this if the DataNode is not yet aware of the slot.
 * 
 * @param slot           The slot to free.
 */
public void freeSlot(Slot slot) {
  Preconditions.checkState(shmManager != null);
  slot.makeInvalid();
  shmManager.freeSlot(slot);
}
 

import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitShm.Slot; //导入方法依赖的package包/类
/**
 * Free a slot immediately.
 *
 * ONLY use this if the DataNode is not yet aware of the slot.
 *
 * @param slot           The slot to free.
 */
public void freeSlot(Slot slot) {
  Preconditions.checkState(shmManager != null);
  slot.makeInvalid();
  shmManager.freeSlot(slot);
}