HDDS-11713. Use seek to reach the start transaction.

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/block/DeletedBlockLogImpl.java

@@ -137,6 +137,7 @@ public List<DeletedBlocksTransaction> getFailedTransactions(int count,
             }
           }
         } else {
+          iter.seek(startTxId);
           while (iter.hasNext() && failedTXs.size() < count) {
             DeletedBlocksTransaction delTX = iter.next().getValue();
             if (delTX.getCount() == -1 && delTX.getTxID() >= startTxId) {

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/block/DeletedBlockLogStateManagerImpl.java

@@ -144,7 +144,9 @@ public void seekToLast() {
       @Override
       public TypedTable.KeyValue<Long, DeletedBlocksTransaction> seek(
           Long key) throws IOException {
-        throw new UnsupportedOperationException("seek");
+        iter.seek(key);
+        findNext();
+        return nextTx;
       }
 
       @Override

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/shell/TestDeletedBlocksTxnShell.java

@@ -259,5 +259,27 @@ public void testDeletedBlocksTxnSubcommand() throws Exception {
     currentValidTxnNum = deletedBlockLog.getNumOfValidTransactions();
     LOG.info("Valid num of txns: {}", currentValidTxnNum);
     assertEquals(30, currentValidTxnNum);
+
+    // Fail first 20 txns be failed
+    // increment retry count than threshold, count will be set to -1
+    for (int i = 0; i < maxRetry + 1; i++) {
+      deletedBlockLog.incrementCount(txIds);
+    }
+    flush();
+
+    GetFailedDeletedBlocksTxnSubcommand getFailedBlockCommand =
+        new GetFailedDeletedBlocksTxnSubcommand();
+    outContent.reset();
+    cmd = new CommandLine(getFailedBlockCommand);
+    // set start transaction as 15
+    cmd.parseArgs("-c", "5", "-s", "15");
+    getFailedBlockCommand.execute(scmClient);
+    matchCount = 0;
+    p = Pattern.compile("\"txID\" : \\d+", Pattern.MULTILINE);
+    m = p.matcher(outContent.toString(DEFAULT_ENCODING));
+    while (m.find()) {
+      matchCount += 1;
+    }
+    assertEquals(5, matchCount);
   }
 }