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+---
+title: Feature Gates
+weight: 1175
+content_type: concept
+card:
+  name: reference
+  weight: 60
+---
+
+<!-- overview -->
+This page contains an overview of the various feature gates an administrator
+can specify on etcd.
+
+See [feature stages](#feature-stages) for an explanation of the stages for a feature.
+
+<!-- body -->
+## Overview
+
+Feature gates are a set of key=value pairs that describe etcd features.
+You can turn these features on or off using the `--feature-gates` command line flag
+on etcd.
+
+etcd lets you enable or disable a set of feature gates.
+Use `-h` flag to see a full set of feature gates.
+To set feature gates, use the `--feature-gates` flag assigned to a list of feature pairs in commandline:
+
+```shell
+--feature-gates=...,StopGRPCServiceOnDefrag=true
+```
+
+Or specify `feature-gates` in YAML config file:
+
+```shell
+feature-gates: ...,StopGRPCServiceOnDefrag=true
+```
+
+The following tables are a summary of the feature gates that you can set on
+etcd.
+
+### Feature gates for Alpha or Beta features
+
+| Feature                          | Default | Stage | Details                                                                              |
+|----------------------------------|---------|-------|--------------------------------------------------------------------------------------|
+| StopGRPCServiceOnDefrag          | false   | Alpha |Enables etcd gRPC service to stop serving client requests on defragmentation.         |
+| InitialCorruptCheck              | false   | Alpha |Enables the write transaction to use a shared buffer in its readonly check operations.|
+| CompactHashCheck                 | false   | Alpha |Enables to check data corruption before serving any client/peer traffic.              |
+| TxnModeWriteWithSharedBuffer     | true    | Beta  |Enables leader to periodically check followers compaction hashes.                     |
+
+## Using a feature
+
+### Feature stages
+
+A feature can be in *Alpha*, *Beta* or *GA* stage.
+An *Alpha* feature means:
+
+* Disabled by default.
+* Might be buggy. Enabling the feature may expose bugs.
+* Support for feature may be dropped at any time without notice.
+* The API may change in incompatible ways in a later software release without notice.
+* Recommended for use only in short-lived testing clusters, due to increased
+  risk of bugs and lack of long-term support.
+
+A *Beta* feature means:
+
+* Enabled by default.
+* The feature is well tested. Enabling the feature is considered safe.
+* Support for the overall feature will not be dropped, though details may change.
+* Recommended for only non-business-critical uses because of potential for
+  discovering new hard-to-spot bugs through wider adoption.
+
+**Note:**
+Please do try *Beta* features and give feedback on them!
+After they exit beta, it may not be practical for us to make more changes.
+
+A *General Availability* (GA) feature is also referred to as a *stable* feature. It means:
+
+* The feature is always enabled; you cannot disable it.
+* The corresponding feature gate is no longer needed.
+* Stable versions of features will appear in released software for many subsequent versions.
+
+A *Deprecated* feature means:
+
+* The feature gate is no longer in use.
+* The feature has graduated to GA or been removed.