Fixed a bug which could hide non-ok status in CompactionJob::Run()

Summary: Fixed a bug which could hide non-ok status in CompactionJob::Run()

Test Plan: make

Reviewers: sdong, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D28995

db/compaction_job.cc

@@ -385,17 +385,22 @@ Status CompactionJob::Run() {
         compact_->MergeKeyValueSliceBuffer(&cfd->internal_comparator());
 
         status = ProcessKeyValueCompaction(&imm_micros, input.get(), true);
+        if (!status.ok()) {
+          break;
+        }
 
         compact_->CleanupBatchBuffer();
         compact_->CleanupMergedBuffer();
       }
     }  // done processing all prefix batches
     // finish the last batch
+    if (status.ok()) {
       if (compact_->key_str_buf_.size() > 0) {
         CallCompactionFilterV2(compaction_filter_v2);
       }
       compact_->MergeKeyValueSliceBuffer(&cfd->internal_comparator());
       status = ProcessKeyValueCompaction(&imm_micros, input.get(), true);
+    }
   }  // checking for compaction filter v2
 
   if (status.ok() &&