PageStorage: Fix empty page cause TiFlash failed to start (#9283) (#9285

)

close #9282

PageStorage: Fix empty page cause TiFlash failed to start

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>

Co-authored-by: JaySon <tshent@qq.com>
Co-authored-by: JaySon-Huang <tshent@qq.com>

dbms/src/Common/UniThreadPool.h

@@ -29,7 +29,6 @@
 #include <memory>
 #include <mutex>
 #include <optional>
-#include <queue>
 #include <thread>
 
 namespace DB

dbms/src/Storages/Page/V3/Blob/BlobStat.cpp

@@ -15,6 +15,7 @@
 #include <Common/ProfileEvents.h>
 #include <Storages/Page/V3/Blob/BlobFile.h>
 #include <Storages/Page/V3/Blob/BlobStat.h>
+#include <Storages/Page/V3/PageDefines.h>
 #include <Storages/PathPool.h>
 #include <boost_wrapper/string_split.h>
 #include <common/logger_useful.h>
@@ -216,8 +217,6 @@ std::pair<BlobStats::BlobStatPtr, BlobFileId> BlobStats::chooseStat(
     PageType page_type,
     const std::lock_guard<std::mutex> &)
 {
-    BlobStatPtr stat_ptr = nullptr;
-
     // No stats exist
     if (stats_map.empty())
     {
@@ -301,6 +300,12 @@ BlobStats::StatsMap BlobStats::getStats() const NO_THREAD_SAFETY_ANALYSIS
 
 BlobFileOffset BlobStats::BlobStat::getPosFromStat(size_t buf_size, const std::unique_lock<std::mutex> &)
 {
+    // A shortcut for empty page. All empty pages will be stored
+    // at the beginning of the BlobFile. It should not affects the
+    // sm_max_caps or other fields by adding these empty pages.
+    if (unlikely(buf_size == 0))
+        return 0;
+
     BlobFileOffset offset = 0;
     UInt64 max_cap = 0;
     bool expansion = true;

dbms/src/Storages/Page/V3/Blob/GCInfo.cpp

@@ -33,7 +33,7 @@ struct fmt::formatter<DB::PS::V3::BlobFileGCInfo>
     template <typename FormatContext>
     auto format(const DB::PS::V3::BlobFileGCInfo & i, FormatContext & ctx) const
     {
-        return fmt::format_to(ctx.out(), "<id:{} rate:{:.2f}>", i.blob_id, i.valid_rate);
+        return fmt::format_to(ctx.out(), "<blob_id={} rate={:.2f}>", i.blob_id, i.valid_rate);
     }
 };
 template <>
@@ -53,7 +53,7 @@ struct fmt::formatter<DB::PS::V3::BlobFileTruncateInfo>
     {
         return fmt::format_to(
             ctx.out(),
-            "<id:{} origin:{} truncate:{} rate:{:.2f}>",
+            "<blob_id={} origin={} truncate={} rate={:.2f}>",
             i.blob_id,
             i.origin_size,
             i.truncated_size,
@@ -86,7 +86,7 @@ String BlobStoreGCInfo::toTypeString(const Type type_index) const
     if (blob_gc_info[type_index].empty())
         return fmt::format("{{{}: [null]}}", magic_enum::enum_name(type_index));
 
-    // e.g. {FullGC: [<id:4 rate:0.16>]}}
+    // e.g. {FullGC: [<blob_id=4 rate=0.16>]}
     FmtBuffer fmt_buf;
     fmt_buf.fmtAppend("{{{}: [", magic_enum::enum_name(type_index))
         .joinStr(
@@ -103,6 +103,7 @@ String BlobStoreGCInfo::toTypeTruncateString(const Type type_index) const
     if (blob_gc_truncate_info.empty())
         return fmt::format("{{{}: [null]}}", magic_enum::enum_name(type_index));
 
+    // e.g. {Truncated: [<blob_id=221 origin=0 truncate=0 rate=0.00>]}
     FmtBuffer fmt_buf;
     fmt_buf.fmtAppend("{{{}: [", magic_enum::enum_name(type_index))
         .joinStr(