ivandika3 commented on code in PR #4585:
URL: https://github.com/apache/ozone/pull/4585#discussion_r1327951911
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hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/recovery/ReconOMMetadataManager.java:
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@@ -47,4 +50,59 @@ public interface ReconOMMetadataManager extends
OMMetadataManager {
* @return true if OM Tables are initialized, otherwise false.
*/
boolean isOmTablesInitialized();
+
+ /**
+ * Return a list of volumes owned by a given user; if user is null, returns
+ * all volumes.
+ *
+ * This method can be optimized by using username as a filter.
+ *
+ * @param startKey the start volume name determines where to start listing
+ * from, this key is excluded from the result. Returns all the volumes if
+ * it's null.
+ * @param maxKeys the maximum number of volumes to return.
+ * @return volumes with starting from <code>startKey</code> limited by
+ * <code>maxKeys</code>
+ */
+ List<OmVolumeArgs> listVolumes(String startKey,
+ int maxKeys) throws IOException;
+
+ /**
+ * Return all volumes in the file system.
+ * @return all the volumes from the OM DB.
+ */
+ List<OmVolumeArgs> listVolumes() throws IOException;
+
+ /**
+ * Check if volume exists in the OM table.
+ * @param volName volume name without any protocol prefix.
+ * @return true if volume exists, otherwise false.
+ * @throws IOException IOE
+ */
+ boolean volumeExists(String volName) throws IOException;
+
+ /**
+ * Returns a list of buckets represented by {@link OmBucketInfo} in the given
+ * volume.
+ *
+ * @param volumeName the name of the volume. If volumeName is empty, list
+ * all buckets in the cluster.
+ * @param startBucket the start bucket name. Only the buckets whose name is
+ * after this value will be included in the result. This key is excluded from
+ * the result.
+ * @param maxNumOfBuckets the maximum number of buckets to return. It ensures
+ * the size of the result will not exceed this limit.
+ * @return a list of buckets.
+ * @throws IOException
+ */
+ List<OmBucketInfo> listBucketsUnderVolume(String volumeName,
+ String startBucket, int maxNumOfBuckets) throws IOException;
+
+ /**
+ * List all buckets under a volume.
Review Comment:
The UI and `BucketEndpoint` will use `listBucketsUnderVolume(String
volumeName,
String startBucket, int maxNumOfBuckets)` instead of this method. This
method used in the `VolumeEntityHandler` and `RootEntityHandler` and stored for
compatibility reasons.
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