Add preflight check to dynamic mapping updates #48867
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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 elastic#35564
DaveCTurner
added
>enhancement
:Distributed Indexing/CRUD
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Pinging @elastic/es-distributed (:Distributed/CRUD) |
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Build failed due to #48700 @elasticmachine run elasticsearch-ci/1 |
DaveCTurner
deleted the
2019-11-05-preflight-mapping-updates-7x-backport
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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