Merge pull request h2oai#499 from h2oai/JG_PUBDEV-3534_custom-jar-path

allow to use arbitrary h2o.jar, closes PUBDEV-3534

h2o-py/h2o/backend/server.py

@@ -203,6 +203,14 @@ def _find_jar(self, path0=None):
     @staticmethod
     def _jar_paths():
         """Produce potential paths for an h2o.jar executable."""
+
+        # PUBDEV-3534 hook to use arbitrary h2o.jar
+        own_jar = os.getenv("H2O_JAR_PATH", "")
+        if own_jar != "":
+            if not os.path.isfile(own_jar):
+                raise H2OStartupError("Environment variable H2O_JAR_PATH is set to '%d' but file does not exists, unset environment variable or provide valid path to h2o.jar file." % own_jar)
+            yield own_jar
+
         # Check if running from an h2o-3 src folder (or any subfolder), in which case use the freshly-built h2o.jar
         cwd_chunks = os.path.abspath(".").split(os.path.sep)
         for i in range(len(cwd_chunks), 0, -1):

h2o-r/h2o-package/R/connection.R

@@ -569,7 +569,14 @@ h2o.clusterStatus <- function() {
 # It will download a jar file if it needs to.
 .h2o.downloadJar <- function(overwrite = FALSE) {
   if(!is.logical(overwrite) || length(overwrite) != 1L || is.na(overwrite)) stop("`overwrite` must be TRUE or FALSE")
-
+
+  # PUBDEV-3534 hook to use arbitrary h2o.jar
+  own_jar = Sys.getenv("H2O_JAR_PATH")
+  if (nzchar(own_jar)) {
+    if (!file.exists(own_jar)) stop(sprintf("Environment variable H2O_JAR_PATH is set to '%s' but file does not exists, unset environment variable or provide valid path to h2o.jar file.", own_jar))
+    return(own_jar)
+  }
+
   if (is.null(.h2o.pkg.path)) {
     pkg_path = dirname(system.file(".", package = "h2o"))
   } else {