sst_dump support for range deletion

Summary:
Change DumpTable() so we can see the range deletion meta-block.
Closes https://github.com/facebook/rocksdb/pull/1505

Differential Revision: D4172227

Pulled By: ajkr

fbshipit-source-id: ae35665

table/block_based_table_reader.cc

@@ -1902,6 +1902,10 @@ Status BlockBasedTable::DumpTable(WritableFile* out_file) {
         out_file->Append("  Filter block handle: ");
         out_file->Append(meta_iter->value().ToString(true).c_str());
         out_file->Append("\n");
+      } else if (meta_iter->key() == rocksdb::kRangeDelBlock) {
+        out_file->Append("  Range deletion block handle: ");
+        out_file->Append(meta_iter->value().ToString(true).c_str());
+        out_file->Append("\n");
       }
     }
     out_file->Append("\n");
@@ -1961,6 +1965,19 @@ Status BlockBasedTable::DumpTable(WritableFile* out_file) {
   if (!s.ok()) {
     return s;
   }
+  // Output range deletions block
+  auto range_del_iter = NewRangeTombstoneIterator(ReadOptions());
+  range_del_iter->SeekToFirst();
+  if (range_del_iter->Valid()) {
+    out_file->Append(
+        "Range deletions:\n"
+        "--------------------------------------\n"
+        "  ");
+    for (; range_del_iter->Valid(); range_del_iter->Next()) {
+      DumpKeyValue(range_del_iter->key(), range_del_iter->value(), out_file);
+    }
+    out_file->Append("\n");
+  }
   // Output Data blocks
   s = DumpDataBlocks(out_file);
 
@@ -2085,8 +2102,33 @@ Status BlockBasedTable::DumpDataBlocks(WritableFile* out_file) {
         out_file->Append("Error reading the block - Skipped \n");
         break;
       }
-      Slice key = datablock_iter->key();
-      Slice value = datablock_iter->value();
+      DumpKeyValue(datablock_iter->key(), datablock_iter->value(), out_file);
+    }
+    out_file->Append("\n");
+  }
+
+  uint64_t num_datablocks = block_id - 1;
+  if (num_datablocks) {
+    double datablock_size_avg =
+        static_cast<double>(datablock_size_sum) / num_datablocks;
+    out_file->Append("Data Block Summary:\n");
+    out_file->Append("--------------------------------------");
+    out_file->Append("\n  # data blocks: ");
+    out_file->Append(rocksdb::ToString(num_datablocks));
+    out_file->Append("\n  min data block size: ");
+    out_file->Append(rocksdb::ToString(datablock_size_min));
+    out_file->Append("\n  max data block size: ");
+    out_file->Append(rocksdb::ToString(datablock_size_max));
+    out_file->Append("\n  avg data block size: ");
+    out_file->Append(rocksdb::ToString(datablock_size_avg));
+    out_file->Append("\n");
+  }
+
+  return Status::OK();
+}
+
+void BlockBasedTable::DumpKeyValue(const Slice& key, const Slice& value,
+                                   WritableFile* out_file) {
   InternalKey ikey;
   ikey.DecodeFrom(key);
 
@@ -2114,28 +2156,6 @@ Status BlockBasedTable::DumpDataBlocks(WritableFile* out_file) {
   out_file->Append(": ");
   out_file->Append(res_value.c_str());
   out_file->Append("\n  ------\n");
-    }
-    out_file->Append("\n");
-  }
-
-  uint64_t num_datablocks = block_id - 1;
-  if (num_datablocks) {
-    double datablock_size_avg =
-        static_cast<double>(datablock_size_sum) / num_datablocks;
-    out_file->Append("Data Block Summary:\n");
-    out_file->Append("--------------------------------------");
-    out_file->Append("\n  # data blocks: ");
-    out_file->Append(rocksdb::ToString(num_datablocks));
-    out_file->Append("\n  min data block size: ");
-    out_file->Append(rocksdb::ToString(datablock_size_min));
-    out_file->Append("\n  max data block size: ");
-    out_file->Append(rocksdb::ToString(datablock_size_max));
-    out_file->Append("\n  avg data block size: ");
-    out_file->Append(rocksdb::ToString(datablock_size_avg));
-    out_file->Append("\n");
-  }
-
-  return Status::OK();
 }
 
 namespace {

table/block_based_table_reader.h

@@ -265,6 +265,8 @@ class BlockBasedTable : public TableReader {
   // Helper functions for DumpTable()
   Status DumpIndexBlock(WritableFile* out_file);
   Status DumpDataBlocks(WritableFile* out_file);
+  void DumpKeyValue(const Slice& key, const Slice& value,
+                    WritableFile* out_file);
 
   // No copying allowed
   explicit BlockBasedTable(const TableReader&) = delete;