Myracle commented on code in PR #27523:
URL: https://github.com/apache/flink/pull/27523#discussion_r2944247065
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flink-kubernetes/src/main/java/org/apache/flink/kubernetes/configuration/KubernetesConfigOptions.java:
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@@ -586,6 +586,85 @@ public class KubernetesConfigOptions {
"The node label whose value is the same as the
node name. "
+ "Currently, this will only be used to
set the node affinity of TM pods to avoid being scheduled on blocked nodes.");
+ /**
+ * The user-specified PersistentVolumeClaims (PVCs) that will be mounted
into Flink containers.
+ *
+ * <p>The value should be in the form of {@code pvc-name:/mount/path}
separated by commas.
+ * Multiple PVCs can be specified by separating them with commas.
+ *
+ * <p>Example: {@code
checkpoint-pvc:/opt/flink/checkpoints,data-pvc:/opt/flink/data}
+ *
+ * <p>Prerequisites:
+ *
+ * <ul>
+ * <li>The PVCs must exist in the same namespace as the Flink cluster
before deployment
+ * <li>The PVCs must have appropriate access modes:
+ * <ul>
+ * <li>ReadWriteOnce (RWO): For single pod access
+ * <li>ReadWriteMany (RWX): For multiple pods (recommended for HA
setups)
+ * <li>ReadOnlyMany (ROX): For read-only access from multiple pods
+ * </ul>
+ * </ul>
+ *
+ * <p>Common use cases:
+ *
+ * <ul>
+ * <li>Checkpoint storage: Mount a shared PVC for storing checkpoints
+ * <li>Savepoint storage: Mount a PVC for savepoint data
+ * <li>Shared data: Mount read-only PVCs containing reference data
+ * <li>Job artifacts: Mount PVCs containing job JARs or dependencies
+ * </ul>
+ */
+ public static final ConfigOption<Map<String, String>>
KUBERNETES_PERSISTENT_VOLUME_CLAIMS =
+ key("kubernetes.persistent-volume-claims")
+ .mapType()
+ .noDefaultValue()
+ .withDescription(
+ Description.builder()
+ .text(
+ "The user-specified %s that will
be mounted into Flink containers. "
+ + "The value should be in
the form of %s. "
+ + "Multiple PVCs can be
specified, for example: %s. "
+ + "The PVCs must exist in
the same namespace as the Flink cluster before deployment. "
+ + "For HA setups with
multiple JobManagers or TaskManagers accessing the same storage, "
+ + "use PVCs with
ReadWriteMany (RWX) or ReadOnlyMany (ROX) access modes.",
+ link(
+
"https://kubernetes.io/docs/concepts/storage/persistent-volumes/";,
+ "PersistentVolumeClaims
(PVCs)"),
+ code("pvc-name:/mount/path"),
+ code(
+
"checkpoint-pvc:/opt/flink/checkpoints,data-pvc:/opt/flink/data"))
+ .build());
+
+ /**
+ * Whether to mount PersistentVolumeClaims (PVCs) as read-only.
+ *
+ * <p>When set to true, all PVCs configured via {@link
#KUBERNETES_PERSISTENT_VOLUME_CLAIMS}
+ * will be mounted as read-only. This is useful when the PVC contains
shared data that should
+ * not be modified by Flink, such as reference datasets or pre-trained
models.
+ *
+ * <p>Note: This setting applies globally to all PVCs configured via {@link
+ * #KUBERNETES_PERSISTENT_VOLUME_CLAIMS}. If you need different access
modes for different PVCs,
+ * consider using pod templates instead.
+ *
+ * <p>Default: false (read-write mode)
Review Comment:
You're right — that Default: false line in the Javadoc is redundant since
defaultValue(false) already makes it clear. Removed it. 👍
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