From c9df3bf7732bb1878082ce3ed4d55830a8bd62bd Mon Sep 17 00:00:00 2001
From: Norbert Podhorszki <pnorbert@ornl.gov>
Date: Wed, 2 Sep 2020 08:31:01 -0400
Subject: [PATCH] Fix StreamReader reading step by step. It only read one block
 if index and never updated.

---
 source/adios2/engine/bp4/BP4Reader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/adios2/engine/bp4/BP4Reader.cpp b/source/adios2/engine/bp4/BP4Reader.cpp
index c24bb03105..ed3a276bfe 100644
--- a/source/adios2/engine/bp4/BP4Reader.cpp
+++ b/source/adios2/engine/bp4/BP4Reader.cpp
@@ -578,7 +578,7 @@ size_t BP4Reader::UpdateBuffer(const TimePoint &timeoutInstant,
                 m_MDFileAbsolutePos = m_MDFileAlreadyReadSize;
                 m_MDFileAlreadyReadSize = expectedMinFileSize;
 
-                m_MDIndexFileAlreadyReadSize = idxFileSize;
+                m_MDIndexFileAlreadyReadSize += newIdxSize;
 
                 sizes[0] = newIdxSize;
                 sizes[1] = m_MDFileAlreadyReadSize;