Description
org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.java
public synchronized void removeShm(ShortCircuitShm shm) { if (LOG.isTraceEnabled()) { LOG.debug("removing shm " + shm); ------------------ I think here should be trace } // 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(); }