/** Iterate through all items and detect timed-out items */
void pendingReplicationCheck() {
synchronized (pendingReplications) {
Iterator iter = pendingReplications.entrySet().iterator();
long now = FSNamesystem.now();
FSNamesystem.LOG.debug("PendingReplicationMonitor checking Q");
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
PendingBlockInfo pendingBlock = (PendingBlockInfo) entry.getValue();
if (now > pendingBlock.getTimeStamp() + timeout) {
Block block = (Block) entry.getKey();
synchronized (timedOutItems) {
timedOutItems.add(block);
}
FSNamesystem.LOG.warn("PendingReplicationMonitor timed out block " + block);
iter.remove();
}
}
}
}
public void run() {
while (fsRunning) {
long period = Math.min(defaultRecheckInterval, timeout);
try {
pendingReplicationCheck();
Thread.sleep(period);
} catch (InterruptedException ie) {
FSNamesystem.LOG.debug("PendingReplicationMonitor thread received exception. " + ie);
}
}
}
/**
* One replication request for this block has finished. Decrement the number of pending
* replication requests for this block.
*/
void remove(Block block) {
synchronized (pendingReplications) {
PendingBlockInfo found = pendingReplications.get(block);
if (found != null) {
FSNamesystem.LOG.debug("Removing pending replication for block" + block);
found.decrementReplicas();
if (found.getNumReplicas() <= 0) {
pendingReplications.remove(block);
}
}
}
}