mirror of
https://github.com/honeymoose/OpenSearch.git
synced 2025-02-09 22:45:04 +00:00
bd5c6c4779
Today if the primary discovers that an indexing request needs a mapping update then it will send it to the master for validation and processing. If, however, the put-mapping request is invalid then the master still processes it as a (no-op) cluster state update. When there are a large number of indexing operations that result in invalid mapping updates this can overwhelm the master. However, the primary already has a reasonably up-to-date mapping against which it can check the (approximate) validity of the put-mapping request before sending it to the master. For instance it is not possible to remove fields in a mapping update, so if the primary detects that a mapping update will exceed the fields limit then it can reject it itself and avoid bothering the master. This commit adds a pre-flight check to the mapping update path so that the primary can discard obviously-invalid put-mapping requests itself. Fixes #35564 Backport of #48817