/**
* Call heartbeat check function of HeartbeatManager and get under replicated blocks count within
* write lock to make sure computeDatanodeWork doesn't interfere.
*
* @param namesystem the FSNamesystem
* @param bm the BlockManager to manipulate
* @return the number of under replicated blocks
*/
public static int checkHeartbeatAndGetUnderReplicatedBlocksCount(
FSNamesystem namesystem, BlockManager bm) {
namesystem.writeLock();
try {
bm.getDatanodeManager().getHeartbeatManager().heartbeatCheck();
return bm.getUnderReplicatedNotMissingBlocks();
} finally {
namesystem.writeUnlock();
}
}
