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+# HDDS-10685 : Short-Circuit Read
+
+Epic: [HDDS-10685](https://issues.apache.org/jira/browse/HDDS-10685)
+Feature branch:  https://github.com/apache/ozone/tree/HDDS-10685
+
+## 1. Builds/intermittent test failures
+
+There are no intermittent failures specific to the HDDS-10685 branch as of now. During the development, it was ensured all the CI checks were clean prior to every commit merge. 
+
+The plan is to run repeated CI checks on the merge commit to master.
+
+## 2. Documentation
+
+[User Documentation](https://github.com/apache/ozone/blob/HDDS-10685/hadoop-hdds/docs/content/feature/Short-Circuit-Read.md) of Short Circuit Read has been added.
+
+## 3. Design, attached the docs
+
+Design document can be found here : [Short Circuit Read Support](https://github.com/apache/ozone/blob/HDDS-10685/hadoop-hdds/docs/content/design/short-circuit-read.md).
+
+## 4. S3 compatibility
+
+N/A, S3 compatibility remains the same. Short Circuit Read only affects the client and DataNode read path. 
+
+## 5. Docker-compose / Acceptance tests
+
+New robot test [short-circuit.robot](https://github.com/apache/ozone/blob/HDDS-10685/hadoop-ozone/dist/src/main/smoketest/short-circuit/short-circuit.robot) is being added.
+
+New acceptance tests are added, mainly tests the Short Circuit Read metrics. It does not test fault injection.
+
+## 6. Support of containers / Kubernetes
+
+No addition. No change in existing support.
+
+## 7. Coverage / Code quality
+
+[New Code Coverage](https://sonarcloud.io/summary/new_code?id=hadoop-ozone&branch=HDDS-10685) for Short Circuit Read Support (HDDS-10685) is 80.78%% and [Overall Code Coverage](https://sonarcloud.io/summary/overall?id=hadoop-ozone&branch=HDDS-10685) is 78.5%.
+[Overall Code Coverage](https://sonarcloud.io/summary/overall?id=hadoop-ozone&branch=master) for master is 78.5%%.
+
+## 8. Build time
+
+[Build time for the latest commit](https://github.com/apache/ozone/actions/runs/27126447271/job/80056268213) from HDDS-10685 Branch is 9m 59s.
+[Build time for the latest commit](https://github.com/apache/ozone/actions/runs/29915076929/job/88926295859) from the master branch is 10m 43s.
+
+## 9. Possible incompatible changes/used feature flag
+
+Short-circuit read is gated by the non-rolling upgrade framework as HDDSLayoutFeature.SHORT_CIRCUIT_READS (layout version 11). 
+
+It remains inactive until the cluster upgrade is finalized. A global enable/disable switch is provided via ozone.client.read.short-circuit (default: false).
+
+To enable the feature (after finalization), add the following to the client and Datanode ozone-site.xml to enable the feature:
+
+```xml
+<property>
+    <name>ozone.client.read.short-circuit</name>
+    <value>true</value>
+    <tag>CLIENT, DATANODE</tag>
+    <description>Disable or enable the short-circuit local read feature. By default it is disabled.</description>
+</property>
+```
+And the following to the client and Datanode ozone-site.xml, to specify the path of the UNIX domain socket:
+```xml
+<property>
+    <name>ozone.domain.socket.path</name>
+    <value></value>
+    <tag>CLIENT, DATANODE</tag>
+    <description>UNIX domain socket path for co-located client–Datanode short-circuit communication.</description>
+</property>
+```
+
+## 10. Third-party dependencies/License changes
+
+There are no third party dependencies introduced by this feature.
+
+## 11. Performance
+
+The major workflow of Short-Circuit Read is: The client detects a local Datanode replica → opens a UNIX domain socket → sends GetBlock with requestShortCircuitAccess=true → Datanode passes a file descriptor → The client reads block data directly from the local disk via FileChannel.
+
+End-to-end read performance is therefore dominated by local disk I/O, similar to a direct file read, rather than by gRPC data transfer.
+
+A benchmark was run against feature branch HDDS-10685, and get this result https://docs.google.com/document/d/1xmjCbK4rP287pPN0_iOonnQee6HgwSI3h5hVbtgfu3k/edit?tab=t.0. 
+
+Metrics (ContainerLocalOps, local op latencies, local bytes stats) are added in Datanode to observe the runtime state/latency.
+
+## 12. Security considerations
+
+Short-Circuit Read does not introduce any new CLI or admin command.
+
+Short-circuit communication uses a UNIX domain socket (`ozone.domain.socket.path`) between the client and Datanode. 
+
+It follows the same [Hadoop Socket Path Security](https://cwiki.apache.org/confluence/spaces/HADOOP2/pages/120730260/SocketPathSecurity) rules as HDFS short-circuit reads.
+