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-rw-r--r--src/mongo/db/s/migration_chunk_cloner_source_legacy.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mongo/db/s/migration_chunk_cloner_source_legacy.h b/src/mongo/db/s/migration_chunk_cloner_source_legacy.h
index 3f866595cda..f41127afad1 100644
--- a/src/mongo/db/s/migration_chunk_cloner_source_legacy.h
+++ b/src/mongo/db/s/migration_chunk_cloner_source_legacy.h
@@ -357,6 +357,9 @@ private:
// pre-allocation (initial clone).
uint64_t _averageObjectSizeForCloneLocs{0};
+ // The estimated average object _id size during the clone phase.
+ uint64_t _averageObjectIdSize{0};
+
// Represents all of the requested but not yet fulfilled operations to be tracked, with regards
// to the chunk being cloned.
uint64_t _outstandingOperationTrackRequests{0};