public boolean evaluate(Offer offer) {
boolean accept = false;
if (dnsResolver.journalNodesResolvable()) {
NodeConfig nameNodeConfig = config.getNodeConfig(HDFSConstants.NAME_NODE_ID);
NodeConfig zkfcNodeConfig = config.getNodeConfig(HDFSConstants.ZKFC_NODE_ID);
if (offerNotEnoughResources(
offer,
(nameNodeConfig.getCpus() + zkfcNodeConfig.getCpus()),
(nameNodeConfig.getMaxHeap() + zkfcNodeConfig.getMaxHeap()))) {
log.info("Offer does not have enough resources");
} else {
List<String> deadNameNodes = persistenceStore.getDeadNameNodes();
if (deadNameNodes.isEmpty()) {
if (persistenceStore.getNameNodes().size() == HDFSConstants.TOTAL_NAME_NODES) {
log.info(String.format("Already running %s namenodes", HDFSConstants.TOTAL_NAME_NODES));
} else if (persistenceStore.nameNodeRunningOnSlave(offer.getHostname())) {
log.info(String.format("Already running namenode on %s", offer.getHostname()));
} else if (persistenceStore.dataNodeRunningOnSlave(offer.getHostname())) {
log.info(
String.format("Cannot colocate namenode and datanode on %s", offer.getHostname()));
} else if (!persistenceStore.journalNodeRunningOnSlave(offer.getHostname())) {
log.info(
String.format(
"We need to colocate the namenode with a journalnode and there is"
+ "no journalnode running on this host. %s",
offer.getHostname()));
} else {
accept = true;
}
} else if (deadNameNodes.contains(offer.getHostname())) {
accept = true;
}
}
}
return accept;
}