Throw NoSpace instead of IOError when out of space.

Summary:
Replaces #1702 and is updated from feedback.
Closes https://github.com/facebook/rocksdb/pull/3531

Differential Revision: D7457395

Pulled By: gfosco

fbshipit-source-id: 25a21dd8cfa5a6e42e024208b444d9379d920c82

db/compaction_job.cc

@@ -1186,7 +1186,7 @@ Status CompactionJob::FinishCompactionOutputFile(
     if (sfm->IsMaxAllowedSpaceReached()) {
       // TODO(ajkr): should we return OK() if max space was reached by the final
       // compaction output file (similarly to how flush works when full)?
-      s = Status::IOError("Max allowed space was reached");
+      s = Status::NoSpace("Max allowed space was reached");
       TEST_SYNC_POINT(
           "CompactionJob::FinishCompactionOutputFile:"
           "MaxAllowedSpaceReached");

db/db_impl_compaction_flush.cc

@@ -172,7 +172,7 @@ Status DBImpl::FlushMemTableToOutputFile(
           immutable_db_options_.db_paths[0].path, file_meta.fd.GetNumber());
       sfm->OnAddFile(file_path);
       if (sfm->IsMaxAllowedSpaceReached() && bg_error_.ok()) {
-        Status new_bg_error = Status::IOError("Max allowed space was reached");
+        Status new_bg_error = Status::NoSpace("Max allowed space was reached");
         TEST_SYNC_POINT_CALLBACK(
             "DBImpl::FlushMemTableToOutputFile:MaxAllowedSpaceReached",
             &new_bg_error);