[GitHub] rmatharu commented on a change in pull request #915: Consolidating offset read and write for store-offsets and side-inputs, maintaining backward compatbility

[GitBox]

rmatharu commented on a change in pull request #915: Consolidating offset read 
and write for store-offsets and side-inputs, maintaining backward compatbility
URL: https://github.com/apache/samza/pull/915#discussion_r255834529
 
 

 ##########
 File path: 
samza-core/src/main/java/org/apache/samza/storage/StorageManagerUtil.java
 ##########
 @@ -129,26 +173,35 @@ public static boolean storeExists(File storeDir) {
    * Read and return the contents of the offset file.
    *
    * @param storagePartitionDir the base directory of the store
-   * @param offsetFileName name of the offset file
    * @return the content of the offset file if it exists for the store, null 
otherwise.
    */
-  public static String readOffsetFile(File storagePartitionDir, String 
offsetFileName) {
-    String offset = null;
-    File offsetFileRef = new File(storagePartitionDir, offsetFileName);
+  public static Map<SystemStreamPartition, String> readOffsetFile(File 
storagePartitionDir, Set<SystemStreamPartition> storeSSPs) {
+    Map<SystemStreamPartition, String> offsets = null;
+    String fileContents;
+    File offsetFileRef = new File(storagePartitionDir, OFFSET_FILE_NAME);
     String storePath = storagePartitionDir.getPath();
 
     if (offsetFileRef.exists()) {
       LOG.info("Found offset file in storage partition directory: {}", 
storePath);
       try {
-        offset = FileUtil.readWithChecksum(offsetFileRef);
+        fileContents = FileUtil.readWithChecksum(offsetFileRef);
+        try {
+          offsets = OBJECT_MAPPER.readValue(fileContents, 
OFFSETS_TYPE_REFERENCE);
+        } catch (JsonParseException | JsonMappingException e) {
+          LOG.info("Exception in json-parsing offset file {} {}, reading as 
string offset-value", storagePartitionDir.toPath(), OFFSET_FILE_NAME);
+          offsets = (storeSSPs.size() == 1) ? 
storeSSPs.stream().collect(Collectors.toMap(x -> x, y -> fileContents)) : null;
 
 Review comment:
   done

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