/**
* Start the specified number of master servers with ports starting from a specified number. Finds
* free web and RPC ports up front for all of the masters first, then starts them on those ports,
* populating 'masters' map.
*
* @param masterStartPort The starting of the port range for the masters.
* @param numMasters Number of masters to start.
* @param baseDirPath Kudu base directory.
* @return Next free port.
* @throws Exception If we are unable to start the masters.
*/
static int startMasters(int masterStartPort, int numMasters, String baseDirPath)
throws Exception {
LOG.info("Starting {} masters...", numMasters);
// Get the list of web and RPC ports to use for the master consensus configuration:
// request NUM_MASTERS * 2 free ports as we want to also reserve the web
// ports for the consensus configuration.
List<Integer> ports = TestUtils.findFreePorts(masterStartPort, numMasters * 2);
int lastFreePort = ports.get(ports.size() - 1);
List<Integer> masterRpcPorts = Lists.newArrayListWithCapacity(numMasters);
List<Integer> masterWebPorts = Lists.newArrayListWithCapacity(numMasters);
masterHostPorts = Lists.newArrayListWithCapacity(numMasters);
for (int i = 0; i < numMasters * 2; i++) {
if (i % 2 == 0) {
masterRpcPorts.add(ports.get(i));
masterHostPorts.add(HostAndPort.fromParts("127.0.0.1", ports.get(i)));
} else {
masterWebPorts.add(ports.get(i));
}
}
masterAddresses = NetUtil.hostsAndPortsToString(masterHostPorts);
for (int i = 0; i < numMasters; i++) {
long now = System.currentTimeMillis();
String dataDirPath = baseDirPath + "/master-" + i + "-" + now;
String flagsPath = TestUtils.getFlagsPath();
// The web port must be reserved in the call to findFreePorts above and specified
// to avoid the scenario where:
// 1) findFreePorts finds RPC ports a, b, c for the 3 masters.
// 2) start master 1 with RPC port and let it bind to any (specified as 0) web port.
// 3) master 1 happens to bind to port b for the web port, as master 2 hasn't been
// started yet and findFreePort(s) is "check-time-of-use" (it does not reserve the
// ports, only checks that when it was last called, these ports could be used).
List<String> masterCmdLine =
Lists.newArrayList(
TestUtils.findBinary("kudu-master"),
"--flagfile=" + flagsPath,
"--fs_wal_dir=" + dataDirPath,
"--fs_data_dirs=" + dataDirPath,
"--rpc_bind_addresses=127.0.0.1:" + masterRpcPorts.get(i),
"--webserver_port=" + masterWebPorts.get(i));
if (numMasters > 1) {
masterCmdLine.add("--master_addresses=" + masterAddresses);
}
MASTERS.put(
masterRpcPorts.get(i),
configureAndStartProcess(masterCmdLine.toArray(new String[masterCmdLine.size()])));
if (flagsPath.startsWith(baseDirPath)) {
// We made a temporary copy of the flags; delete them later.
pathsToDelete.add(flagsPath);
}
pathsToDelete.add(dataDirPath);
}
return lastFreePort + 1;
}
