From a8fb918b6f1ef49b8b14c5c492581ff84d484eb6 Mon Sep 17 00:00:00 2001
From: "Fabian.Jakub" <fabian@jakub.com>
Date: Thu, 14 Feb 2019 13:21:28 +0100
Subject: [PATCH] fix hdf5 chunksizes of 0

  chunksize must not be 0.
  H5Pset_chunk,(chunkspace, dim, chunkDims) will otherwise give an
  error.
  This happened for example when dumping a dmlabel inside a dmplex which
  has only entries on non-local points.
---
 src/vec/is/is/impls/general/general.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vec/is/is/impls/general/general.c b/src/vec/is/is/impls/general/general.c
index c6930cf..476a149 100644
--- a/src/vec/is/is/impls/general/general.c
+++ b/src/vec/is/is/impls/general/general.c
@@ -264,7 +264,7 @@ static PetscErrorCode ISView_General_HDF5(IS is, PetscViewer viewer)
   ierr = PetscHDF5IntCast(N/bs,dims + dim);CHKERRQ(ierr);
 
   maxDims[dim]   = dims[dim];
-  chunkDims[dim] = dims[dim];
+  chunkDims[dim] = PetscMax(1,dims[dim]);
   ++dim;
   if (bs >= 1) {
     dims[dim]      = bs;
-- 
2.7.4