file/data: object store part 2

lectures/file-and-data-systems/slides.qmd

@@ -313,8 +313,17 @@ Add a similar function to the previous one for reading, and read the data you ju
 
 * Focus on data distribution and replication, direct access
 * Data is presented as immutable "objects" ("BLOB")
+* Each object has a globally unique identifier (eg. UUID or hash)
 * Usually only supports creation ("put") and retrieval ("get")
 
+## Object storage -- metadata
+
+* Object metadata stored separate from object
+* Make it independent of data location
+  * Provide object migration or replication across devices
+  * Allows optimizations (eg. database, indices)
+* Enables additional or user defined metadata
+
 ## Files containing *files*
 
 * Explicit: zip, tar, ...