@Override
public void configure(
BackendTarget backend,
String serializedCatalog,
CatalogContext catalogContext,
int kfactor,
CatalogSpecificPlanner csp,
int numberOfPartitions,
VoltDB.START_ACTION startAction,
StatsAgent agent,
MemoryStats memStats,
CommandLog cl,
NodeDRGateway nodeDRGateway,
String coreBindIds)
throws KeeperException, InterruptedException, ExecutionException {
try {
m_leaderCache.start(true);
} catch (Exception e) {
VoltDB.crashLocalVoltDB("Unable to configure SpInitiator.", true, e);
}
// configure DR
PartitionDRGateway drGateway =
PartitionDRGateway.getInstance(
m_partitionId, nodeDRGateway, true, VoltDB.createForRejoin(startAction));
((SpScheduler) m_scheduler).setDRGateway(drGateway);
super.configureCommon(
backend,
serializedCatalog,
catalogContext,
csp,
numberOfPartitions,
startAction,
agent,
memStats,
cl,
coreBindIds,
drGateway);
m_tickProducer.start();
// add ourselves to the ephemeral node list which BabySitters will watch for this
// partition
LeaderElector.createParticipantNode(
m_messenger.getZK(),
LeaderElector.electionDirForPartition(m_partitionId),
Long.toString(getInitiatorHSId()),
null);
}
/**
* Given a set of partition IDs, return a map of partition to a list of HSIDs of all the sites
* with copies of each partition
*/
public Map<Integer, List<Long>> getReplicasForPartitions(Collection<Integer> partitions) {
Map<Integer, List<Long>> retval = new HashMap<Integer, List<Long>>();
List<Pair<Integer, ZKUtil.ChildrenCallback>> callbacks =
new ArrayList<Pair<Integer, ZKUtil.ChildrenCallback>>();
for (Integer partition : partitions) {
String zkpath = LeaderElector.electionDirForPartition(partition);
ZKUtil.ChildrenCallback cb = new ZKUtil.ChildrenCallback();
callbacks.add(Pair.of(partition, cb));
m_zk.getChildren(zkpath, false, cb, null);
}
for (Pair<Integer, ZKUtil.ChildrenCallback> p : callbacks) {
final Integer partition = p.getFirst();
try {
List<String> children = p.getSecond().getChildren();
List<Long> sites = new ArrayList<Long>();
for (String child : children) {
sites.add(Long.valueOf(child.split("_")[0]));
}
retval.put(partition, sites);
} catch (KeeperException ke) {
org.voltdb.VoltDB.crashLocalVoltDB(
"KeeperException getting replicas for partition: " + partition, true, ke);
} catch (InterruptedException ie) {
org.voltdb.VoltDB.crashLocalVoltDB(
"InterruptedException getting replicas for partition: " + partition, true, ie);
}
}
return retval;
}
void shutdown() {
try {
m_leaderElector.shutdown();
} catch (Exception e) {
VoltDB.crashLocalVoltDB("Error shutting down GlobalServiceElector's LeaderElector", true, e);
}
}
/**
* Returns the IDs of the partitions currently in the cluster.
*
* @return A list of partition IDs
*/
public static List<Integer> getPartitions(ZooKeeper zk) {
List<Integer> partitions = new ArrayList<Integer>();
try {
List<String> children = zk.getChildren(VoltZK.leaders_initiators, null);
for (String child : children) {
partitions.add(LeaderElector.getPartitionFromElectionDir(child));
}
} catch (KeeperException e) {
VoltDB.crashLocalVoltDB("Failed to get partition IDs from ZK", true, e);
} catch (InterruptedException e) {
VoltDB.crashLocalVoltDB("Failed to get partition IDs from ZK", true, e);
}
return partitions;
}
private boolean isClusterKSafe() {
boolean retval = true;
for (int i = 0; i < m_partitionCount; i++) {
String dir = LeaderElector.electionDirForPartition(i);
try {
List<String> replicas = m_zk.getChildren(dir, null, null);
if (replicas.isEmpty()) {
tmLog.fatal("K-Safety violation: No replicas found for partition: " + i);
retval = false;
}
} catch (Exception e) {
VoltDB.crashLocalVoltDB("Unable to read replicas in ZK dir: " + dir, true, e);
}
}
return retval;
}
/** Given a partition ID, return a list of HSIDs of all the sites with copies of that partition */
public List<Long> getReplicasForPartition(int partition) {
String zkpath = LeaderElector.electionDirForPartition(partition);
List<Long> retval = new ArrayList<Long>();
try {
List<String> children = m_zk.getChildren(zkpath, null);
for (String child : children) {
retval.add(Long.valueOf(child.split("_")[0]));
}
} catch (KeeperException ke) {
org.voltdb.VoltDB.crashLocalVoltDB(
"KeeperException getting replicas for partition: " + partition, true, ke);
} catch (InterruptedException ie) {
org.voltdb.VoltDB.crashLocalVoltDB(
"InterruptedException getting replicas for partition: " + partition, true, ie);
}
return retval;
}
@Override
public void acceptPromotion() throws InterruptedException, ExecutionException, KeeperException {
// Crank up the leader caches. Use blocking startup so that we'll have valid point-in-time
// caches later.
m_iv2appointees.start(true);
m_iv2masters.start(true);
// Figure out what conditions we assumed leadership under.
if (m_iv2appointees.pointInTimeCache().size() == 0) {
tmLog.debug("LeaderAppointer in startup");
m_state.set(AppointerState.CLUSTER_START);
} else if ((m_iv2appointees.pointInTimeCache().size() != m_partitionCount)
|| (m_iv2masters.pointInTimeCache().size() != m_partitionCount)) {
// If we are promoted and the appointees or masters set is partial, the previous appointer
// failed
// during startup (at least for now, until we add add/remove a partition on the fly).
VoltDB.crashGlobalVoltDB("Detected failure during startup, unable to start", false, null);
} else {
tmLog.debug("LeaderAppointer in repair");
m_state.set(AppointerState.DONE);
}
if (m_state.get() == AppointerState.CLUSTER_START) {
// Need to block the return of acceptPromotion until after the MPI is promoted. Wait for this
// latch
// to countdown after appointing all the partition leaders. The
// LeaderCache callback will count it down once it has seen all the
// appointed leaders publish themselves as the actual leaders.
m_startupLatch = new CountDownLatch(1);
writeKnownLiveNodes(m_hostMessenger.getLiveHostIds());
for (int i = 0; i < m_partitionCount; i++) {
String dir = LeaderElector.electionDirForPartition(i);
// Race along with all of the replicas for this partition to create the ZK parent node
try {
m_zk.create(dir, null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
} catch (KeeperException.NodeExistsException e) {
// expected on all nodes that don't start() first.
}
m_callbacks[i] = new PartitionCallback(i);
Pair<BabySitter, List<String>> sitterstuff =
BabySitter.blockingFactory(m_zk, dir, m_callbacks[i], m_es);
m_partitionWatchers[i] = sitterstuff.getFirst();
}
m_startupLatch.await();
} else {
// If we're taking over for a failed LeaderAppointer, we know when
// we get here that every partition had a leader at some point in
// time. We'll seed each of the PartitionCallbacks for each
// partition with the HSID of the last published leader. The
// blocking startup of the BabySitter watching that partition will
// call our callback, get the current full set of replicas, and
// appoint a new leader if the seeded one has actually failed
Map<Integer, Long> masters = m_iv2masters.pointInTimeCache();
tmLog.info("LeaderAppointer repairing with master set: " + masters);
for (Entry<Integer, Long> master : masters.entrySet()) {
int partId = master.getKey();
String dir = LeaderElector.electionDirForPartition(partId);
m_callbacks[partId] = new PartitionCallback(partId, master.getValue());
Pair<BabySitter, List<String>> sitterstuff =
BabySitter.blockingFactory(m_zk, dir, m_callbacks[partId], m_es);
m_partitionWatchers[partId] = sitterstuff.getFirst();
}
// just go ahead and promote our MPI
m_MPI.acceptPromotion();
}
}
/**
* Kick off the leader election. Will block until all of the acceptPromotion() calls to all of the
* services return at the initial leader.
*/
void start() throws KeeperException, InterruptedException, ExecutionException {
m_leaderElector.start(true);
}
