/** Returns <tt>true</tt> if the action starting to be performed on the primary (or is done). */
public boolean start(final boolean fromClusterEvent) throws ElasticSearchException {
final ClusterState clusterState = clusterService.state();
nodes = clusterState.nodes();
try {
ClusterBlockException blockException = checkGlobalBlock(clusterState, request);
if (blockException != null) {
if (blockException.retryable()) {
retry(fromClusterEvent, blockException);
return false;
} else {
throw blockException;
}
}
// check if we need to execute, and if not, return
if (!resolveRequest(clusterState, request, listener)) {
return true;
}
blockException = checkRequestBlock(clusterState, request);
if (blockException != null) {
if (blockException.retryable()) {
retry(fromClusterEvent, blockException);
return false;
} else {
throw blockException;
}
}
shardIt = shards(clusterState, request);
} catch (Exception e) {
listener.onFailure(e);
return true;
}
// no shardIt, might be in the case between index gateway recovery and shardIt initialization
if (shardIt.size() == 0) {
retry(fromClusterEvent, null);
return false;
}
boolean foundPrimary = false;
ShardRouting shardX;
while ((shardX = shardIt.nextOrNull()) != null) {
final ShardRouting shard = shardX;
// we only deal with primary shardIt here...
if (!shard.primary()) {
continue;
}
if (!shard.active() || !nodes.nodeExists(shard.currentNodeId())) {
retry(fromClusterEvent, null);
return false;
}
// check here for consistency
if (checkWriteConsistency) {
WriteConsistencyLevel consistencyLevel = defaultWriteConsistencyLevel;
if (request.consistencyLevel() != WriteConsistencyLevel.DEFAULT) {
consistencyLevel = request.consistencyLevel();
}
int requiredNumber = 1;
if (consistencyLevel == WriteConsistencyLevel.QUORUM && shardIt.size() > 2) {
// only for more than 2 in the number of shardIt it makes sense, otherwise its 1 shard
// with 1 replica, quorum is 1 (which is what it is initialized to)
requiredNumber = (shardIt.size() / 2) + 1;
} else if (consistencyLevel == WriteConsistencyLevel.ALL) {
requiredNumber = shardIt.size();
}
if (shardIt.sizeActive() < requiredNumber) {
retry(fromClusterEvent, null);
return false;
}
}
if (!primaryOperationStarted.compareAndSet(false, true)) {
return true;
}
foundPrimary = true;
if (shard.currentNodeId().equals(nodes.localNodeId())) {
if (request.operationThreaded()) {
request.beforeLocalFork();
threadPool
.executor(executor)
.execute(
new Runnable() {
@Override
public void run() {
performOnPrimary(shard.id(), fromClusterEvent, shard, clusterState);
}
});
} else {
performOnPrimary(shard.id(), fromClusterEvent, shard, clusterState);
}
} else {
DiscoveryNode node = nodes.get(shard.currentNodeId());
transportService.sendRequest(
node,
transportAction,
request,
transportOptions,
new BaseTransportResponseHandler<Response>() {
@Override
public Response newInstance() {
return newResponseInstance();
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void handleResponse(Response response) {
listener.onResponse(response);
}
@Override
public void handleException(TransportException exp) {
// if we got disconnected from the node, or the node / shard is not in the right
// state (being closed)
if (exp.unwrapCause() instanceof ConnectTransportException
|| exp.unwrapCause() instanceof NodeClosedException
|| retryPrimaryException(exp)) {
primaryOperationStarted.set(false);
// we already marked it as started when we executed it (removed the listener) so
// pass false
// to re-add to the cluster listener
retry(false, null);
} else {
listener.onFailure(exp);
}
}
});
}
break;
}
// we should never get here, but here we go
if (!foundPrimary) {
retry(fromClusterEvent, null);
return false;
}
return true;
}
