/**
* Checks whether a block is sufficiently replicated for decommissioning. Full-strength
* replication is not always necessary, hence "sufficient".
*
* @return true if sufficient, else false.
*/
private boolean isSufficientlyReplicated(
BlockInfo block, BlockCollection bc, NumberReplicas numberReplicas) {
final int numExpected = bc.getPreferredBlockReplication();
final int numLive = numberReplicas.liveReplicas();
if (!blockManager.isNeededReplication(block, numExpected, numLive)) {
// Block doesn't need replication. Skip.
LOG.trace("Block {} does not need replication.", block);
return true;
}
// Block is under-replicated
LOG.trace("Block {} numExpected={}, numLive={}", block, numExpected, numLive);
if (numExpected > numLive) {
if (bc.isUnderConstruction() && block.equals(bc.getLastBlock())) {
// Can decom a UC block as long as there will still be minReplicas
if (numLive >= blockManager.minReplication) {
LOG.trace(
"UC block {} sufficiently-replicated since numLive ({}) " + ">= minR ({})",
block,
numLive,
blockManager.minReplication);
return true;
} else {
LOG.trace(
"UC block {} insufficiently-replicated since numLive " + "({}) < minR ({})",
block,
numLive,
blockManager.minReplication);
}
} else {
// Can decom a non-UC as long as the default replication is met
if (numLive >= blockManager.defaultReplication) {
return true;
}
}
}
return false;
}
