/** Adjusts curr and prev number of blocks scheduled every few minutes. */
private void rollBlocksScheduled(long now) {
if (now - lastBlocksScheduledRollTime > BLOCKS_SCHEDULED_ROLL_INTERVAL) {
prevApproxBlocksScheduled.set(currApproxBlocksScheduled);
currApproxBlocksScheduled.reset();
lastBlocksScheduledRollTime = now;
}
}
/** Decrement the number of blocks scheduled. */
void decrementBlocksScheduled(StorageType t) {
if (prevApproxBlocksScheduled.get(t) > 0) {
prevApproxBlocksScheduled.subtract(t, 1);
} else if (currApproxBlocksScheduled.get(t) > 0) {
currApproxBlocksScheduled.subtract(t, 1);
}
// its ok if both counters are zero.
}
/** @return Approximate number of blocks currently scheduled to be written to this datanode. */
public int getBlocksScheduled() {
return (int) (currApproxBlocksScheduled.sum() + prevApproxBlocksScheduled.sum());
}
/** Increment the number of blocks scheduled. */
void incrementBlocksScheduled(StorageType t) {
currApproxBlocksScheduled.add(t, 1);
;
}
/**
* @return Approximate number of blocks currently scheduled to be written to the given storage
* type of this datanode.
*/
public int getBlocksScheduled(StorageType t) {
return (int) (currApproxBlocksScheduled.get(t) + prevApproxBlocksScheduled.get(t));
}