diff --git a/R/pkg/R/deserialize.R b/R/pkg/R/deserialize.R
index 7d1f6b0819ed0ca494fdf54b4f3322c26b62e000..6d364f77be7ee9203dc4f0584ebaccc8bda3674f 100644
--- a/R/pkg/R/deserialize.R
+++ b/R/pkg/R/deserialize.R
@@ -102,11 +102,11 @@ readList <- function(con) {
 
 readRaw <- function(con) {
   dataLen <- readInt(con)
-  data <- readBin(con, raw(), as.integer(dataLen), endian = "big")
+  readBin(con, raw(), as.integer(dataLen), endian = "big")
 }
 
 readRawLen <- function(con, dataLen) {
-  data <- readBin(con, raw(), as.integer(dataLen), endian = "big")
+  readBin(con, raw(), as.integer(dataLen), endian = "big")
 }
 
 readDeserialize <- function(con) {
diff --git a/R/pkg/R/sparkR.R b/R/pkg/R/sparkR.R
index 79b79d70943cbd8a1fddd61f89967783822350f3..76c15875b50d50d705d534ed944f7a58cfe24b57 100644
--- a/R/pkg/R/sparkR.R
+++ b/R/pkg/R/sparkR.R
@@ -104,16 +104,13 @@ sparkR.init <- function(
     return(get(".sparkRjsc", envir = .sparkREnv))
   }
 
-  sparkMem <- Sys.getenv("SPARK_MEM", "1024m")
   jars <- suppressWarnings(normalizePath(as.character(sparkJars)))
 
   # Classpath separator is ";" on Windows
   # URI needs four /// as from http://stackoverflow.com/a/18522792
   if (.Platform$OS.type == "unix") {
-    collapseChar <- ":"
     uriSep <- "//"
   } else {
-    collapseChar <- ";"
     uriSep <- "////"
   }