/**
* Load a cluster spec then validate it
*
* @param fileSystem FS
* @param clusterSpecPath path to cspec
* @return the cluster spec
* @throws IOException IO problems
* @throws HoyaException cluster location, spec problems
*/
public static ClusterDescription loadAndValidateClusterSpec(
FileSystem filesystem, Path clusterSpecPath) throws IOException, HoyaException {
ClusterDescription clusterSpec = ClusterDescription.load(filesystem, clusterSpecPath);
// spec is loaded, just look at its state;
verifySpecificationValidity(filesystem, clusterSpecPath, clusterSpec);
return clusterSpec;
}
/**
* Locate a cluster specification in the FS. This includes a check to verify that the file is
* there.
*
* @param filesystem filesystem
* @param clustername name of the cluster
* @return the path to the spec.
* @throws IOException IO problems
* @throws HoyaException if the path isn't there
*/
public static Path locateClusterSpecification(FileSystem filesystem, String clustername)
throws IOException, HoyaException {
Path clusterDirectory = buildHoyaClusterDirPath(filesystem, clustername);
Path clusterSpecPath = new Path(clusterDirectory, HoyaKeys.CLUSTER_SPECIFICATION_FILE);
ClusterDescription.verifyClusterSpecExists(clustername, filesystem, clusterSpecPath);
return clusterSpecPath;
}
/**
* Make a deep copy of the class
*
* @param source source
* @return the copy
*/
public static ClusterDescription copy(ClusterDescription source) {
// currently the copy is done by a generate/save. Inefficient but it goes
// down the tree nicely
try {
return fromJson(source.toJsonString());
} catch (IOException e) {
throw new RuntimeException("ClusterDescription copy failed " + e, e);
}
}
public static boolean writeSpecWithoutOverwriting(
FileSystem clusterFS, Path clusterSpecPath, ClusterDescription clusterSpec) {
try {
clusterSpec.save(clusterFS, clusterSpecPath, false);
} catch (IOException e) {
log.debug("Failed to save cluster specification -race condition? " + e, e);
return false;
}
return true;
}