@@ -49,19 +49,18 @@ final class GrpcBlobReadChannel implements ReadChannel {
 boolean autoGzipDecompression) {
 this.lazyReadChannel =
 new LazyReadChannel(
-Suppliers.memoize(
-() -> {
-ReadObjectRequest req =
-seekReadObjectRequest(request, position, sub(limit, position));
-return ResumableMedia.gapic()
-.read()
-.byteChannel(read)
-.setHasher(Hasher.noop())
-.setAutoGzipDecompression(autoGzipDecompression)
-.buffered(BufferHandle.allocate(chunkSize))
-.setReadObjectRequest(req)
-.build();
-}));
+() -> {
+ReadObjectRequest req =
+seekReadObjectRequest(request, position, sub(limit, position));
+return ResumableMedia.gapic()
+.read()
+.byteChannel(read)
+.setHasher(Hasher.noop())
+.setAutoGzipDecompression(autoGzipDecompression)
+.buffered(BufferHandle.allocate(chunkSize))
+.setReadObjectRequest(req)
+.build();
+});
 }
 
 @Override
@@ -72,7 +71,7 @@ public void setChunkSize(int chunkSize) {
 
 @Override
 public boolean isOpen() {
-return false;
+return lazyReadChannel.isOpen() && lazyReadChannel.getChannel().isOpen();
 }
 
 @Override
@@ -81,8 +80,8 @@ public void close() {
 try {
 lazyReadChannel.getChannel().close();
 } catch (IOException e) {
-// TODO: why does ReadChannel remove IOException?!
-throw new RuntimeException(e);
+// why does ReadChannel remove IOException?!
+throw StorageException.coalesce(e);
 }
 }
 }
@@ -149,13 +148,24 @@ private static final class LazyReadChannel {
 private final Supplier<BufferedReadableByteChannelSession<Object>> session;
 private final Supplier<BufferedReadableByteChannel> channel;
 
+private boolean open = false;
+
 public LazyReadChannel(Supplier<BufferedReadableByteChannelSession<Object>> session) {
 this.session = session;
-this.channel = Suppliers.memoize(() -> session.get().open());
+this.channel =
+Suppliers.memoize(
+() -> {
+open = true;
+return session.get().open();
+});
 }
 
 public BufferedReadableByteChannel getChannel() {
 return channel.get();
 }
+
+public boolean isOpen() {
+return open;
+}
 }
 }

@@ -183,7 +183,8 @@ public static Iterable<Args<BucketField, BucketInfo>> parameters() {
 BucketField.RPO,
 (jsonT, grpcT) -> {
 assertThat(jsonT.getRpo()).isEqualTo(Rpo.DEFAULT);
-assertThat(grpcT.getRpo()).isNull();
+// TODO: cleanup allowed null value in mid nov
+assertThat(grpcT.getRpo()).isAnyOf(Rpo.DEFAULT, null);
 }),
 new Args<>(
 BucketField.SELF_LINK,