devmadhuu commented on code in PR #6969:
URL: https://github.com/apache/ozone/pull/6969#discussion_r1802968266


##########
hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/OMDBInsightEndpoint.java:
##########
@@ -477,17 +428,90 @@ public Response getDeletedKeySummary() {
   @GET
   @Path("/deletePending")
   public Response getDeletedKeyInfo(
-      @DefaultValue(DEFAULT_FETCH_COUNT) @QueryParam(RECON_QUERY_LIMIT)
-      int limit,
-      @DefaultValue(StringUtils.EMPTY) @QueryParam(RECON_QUERY_PREVKEY)
-      String prevKey) {
-    KeyInsightInfoResponse
-        deletedKeyInsightInfo = new KeyInsightInfoResponse();
-    getPendingForDeletionKeyInfo(limit, prevKey,
-        deletedKeyInsightInfo);
+      @DefaultValue(DEFAULT_FETCH_COUNT) @QueryParam(RECON_QUERY_LIMIT) int 
limit,
+      @DefaultValue(StringUtils.EMPTY) @QueryParam(RECON_QUERY_PREVKEY) String 
prevKey,
+      @DefaultValue(StringUtils.EMPTY) @QueryParam(RECON_QUERY_START_PREFIX) 
String startPrefix) {
+
+    // Initialize the response object to hold the key information
+    KeyInsightInfoResponse deletedKeyInsightInfo = new 
KeyInsightInfoResponse();
+
+    boolean keysFound = false;
+
+    try {
+      // Validate startPrefix if it's provided
+      if (isNotBlank(startPrefix) && !validateStartPrefix(startPrefix)) {
+        return createBadRequestResponse("Invalid startPrefix: Path must be at 
the bucket level or deeper.");
+      }
+
+      // Perform the search based on the limit, prevKey, and startPrefix
+      keysFound = getPendingForDeletionKeyInfo(limit, prevKey, startPrefix, 
deletedKeyInsightInfo);
+
+    } catch (IllegalArgumentException e) {
+      LOG.debug("Invalid startPrefix provided: {}", startPrefix, e);
+      return createBadRequestResponse("Invalid startPrefix: " + 
e.getMessage());
+    } catch (IOException e) {
+      LOG.debug("I/O error while searching deleted keys in OM DB", e);

Review Comment:
   Since we are wrapping only `e.getMessage` in returned response, so exact 
issue may be difficult to know in case of real time cluster when we have used 
`LOG.debug`. Is it not better to use `LOG.error` because once some issue occurs 
in real time cluster, we again try to repro by enabling debug level. Same 
comment for other catch blocks.



##########
hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/api/OMDBInsightSearchEndpoint.java:
##########
@@ -389,4 +346,20 @@ private KeyEntityInfo 
createKeyEntityInfoFromOmKeyInfo(String dbKey,
     return keyEntityInfo;
   }
 
+  private boolean validateStartPrefix(String startPrefix) {

Review Comment:
   This similar method is duplicated in `OMDBInsightEndpoint` class also. Given 
this comment earlier but not fixed.



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