From 8e91bd90d23f4b4b6d646e61deb8e2947f471010 Mon Sep 17 00:00:00 2001
From: yangzaorang <yangzaorang@didiglobal.com>
Date: Mon, 2 Aug 2021 17:13:36 -0700
Subject: [PATCH] Fix a issue with initializing blob header buffer (#8537)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/8537

Reviewed By: ajkr

Differential Revision: D29838132

Pulled By: jay-zhuang

fbshipit-source-id: e3e78d5f85f240a1800ace417a8b634f74488e41
---
 db/blob/blob_log_sequential_reader.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/db/blob/blob_log_sequential_reader.h b/db/blob/blob_log_sequential_reader.h
index f8e1c02bd..98afa8518 100644
--- a/db/blob/blob_log_sequential_reader.h
+++ b/db/blob/blob_log_sequential_reader.h
@@ -10,6 +10,8 @@
 #include "db/blob/blob_log_format.h"
 #include "rocksdb/slice.h"
 
+#define MAX_HEADER_SIZE(a, b, c) (a > b ? (a > c ? a : c) : (b > c ? b : c))
+
 namespace ROCKSDB_NAMESPACE {
 
 class RandomAccessFileReader;
@@ -69,10 +71,13 @@ class BlobLogSequentialReader {
   Statistics* statistics_;
 
   Slice buffer_;
-  char header_buf_[BlobLogRecord::kHeaderSize];
+  char header_buf_[MAX_HEADER_SIZE(BlobLogHeader::kSize, BlobLogFooter::kSize,
+                                   BlobLogRecord::kHeaderSize)];
 
   // which byte to read next
   uint64_t next_byte_;
 };
 
 }  // namespace ROCKSDB_NAMESPACE
+
+#undef MAX_HEADER_SIZE
\ No newline at end of file