From 4b622ab0f2afa5c068ae6650a5d3da5d830d617d Mon Sep 17 00:00:00 2001
From: Dhruba Borthakur <dhruba@fb.com>
Date: Mon, 19 Nov 2012 11:54:13 -0800
Subject: [PATCH] Enhance manifest_dump to print each individual edit.

Summary:
The manifest file contains a series of edits. If the verbose
option is switched on, then print each individual edit in the
manifest file. This helps in debugging.

Test Plan: make clean manifest_dump

Reviewers: emayanke, sheki

Reviewed By: sheki

CC: leveldb

Differential Revision: https://reviews.facebook.net/D6807
---
 db/version_set.cc      | 11 ++++++++++-
 db/version_set.h       |  3 ++-
 tools/manifest_dump.cc |  2 +-
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/db/version_set.cc b/db/version_set.cc
index f8c4d71e5..0882f9f4a 100644
--- a/db/version_set.cc
+++ b/db/version_set.cc
@@ -1099,7 +1099,8 @@ Status VersionSet::Recover() {
   return s;
 }
 
-Status VersionSet::DumpManifest(Options& options, std::string& dscname) {
+Status VersionSet::DumpManifest(Options& options, std::string& dscname,
+  bool verbose) {
   struct LogReporter : public log::Reader::Reporter {
     Status* status;
     virtual void Corruption(size_t bytes, const Status& s) {
@@ -1122,6 +1123,7 @@ Status VersionSet::DumpManifest(Options& options, std::string& dscname) {
   uint64_t last_sequence = 0;
   uint64_t log_number = 0;
   uint64_t prev_log_number = 0;
+  int count = 0;
   VersionSet::Builder builder(this, current_);
 
   {
@@ -1142,6 +1144,13 @@ Status VersionSet::DumpManifest(Options& options, std::string& dscname) {
         }
       }
 
+      // Write out each individual edit
+      if (verbose) {
+        printf("*************************Edit[%d] = %s\n", 
+                count, edit.DebugString().c_str());
+      }
+      count++;
+
       if (s.ok()) {
         builder.Apply(&edit);
       }
diff --git a/db/version_set.h b/db/version_set.h
index fa216623d..56b8be1a5 100644
--- a/db/version_set.h
+++ b/db/version_set.h
@@ -286,7 +286,8 @@ class VersionSet {
   const char* LevelSummary(LevelSummaryStorage* scratch) const;
 
   // printf contents (for debugging)
-  Status DumpManifest(Options& options, std::string& manifestFileName);
+  Status DumpManifest(Options& options, std::string& manifestFileName,
+                      bool verbose);
 
   // Return a human-readable short (single-line) summary of the data size
   // of files per level.  Uses *scratch as backing store.
diff --git a/tools/manifest_dump.cc b/tools/manifest_dump.cc
index d8b0a9e0c..2cdf8c7fe 100644
--- a/tools/manifest_dump.cc
+++ b/tools/manifest_dump.cc
@@ -60,7 +60,7 @@ int main(int argc, char** argv) {
 
   VersionSet* versions = new VersionSet(dbname, &options,
                                    tc, cmp);
-  Status s = versions->DumpManifest(options, file);
+  Status s = versions->DumpManifest(options, file, verbose);
   if (!s.ok()) {
     printf("Error in processing file %s %s\n", manifestfile.c_str(),
            s.ToString().c_str());