anuengineer commented on a change in pull request #1510: HDDS-2170. Add Object
IDs and Update ID to Volume Object
URL: https://github.com/apache/hadoop/pull/1510#discussion_r327595783
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File path:
hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmVolumeArgs.java
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@@ -188,6 +237,29 @@ public int hashCode() {
private long quotaInBytes;
private Map<String, String> metadata;
private OmOzoneAclMap aclMap;
+ private long objectID;
+ private long updateID;
+
+ /**
+ * Sets the Object ID for this Object.
+ * Object ID are unique and immutable identifier for each object in the
+ * System.
+ * @param objectID - long
+ */
+ public void setObjectID(long objectID) {
+ this.objectID = objectID;
Review comment:
Object ID represents a unique Identity for an object. Update ID represents
a token that is useful to detect if an object has been changed after a read has
been performed. For example, with update IDs I can cache an object and make
changes, and when I apply I can detect if an object has been updated by any
other thread.
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