reddycharan commented on a change in pull request #1225: Issue #570: getting 
rid of unnecessary synchronization in InterleavedLedgerStorage
URL: https://github.com/apache/bookkeeper/pull/1225#discussion_r171929602
 
 

 ##########
 File path: 
bookkeeper-server/src/test/java/org/apache/bookkeeper/bookie/EntryLogTest.java
 ##########
 @@ -391,4 +400,137 @@ public void testGetEntryLogsSet() throws Exception {
 
         assertEquals(Sets.newHashSet(0L, 1L, 2L, 3L), 
logger.getEntryLogsSet());
     }
+
+    class LedgerStorageWriteTask implements Callable<Boolean> {
+        long ledgerId;
+        int entryId;
+        LedgerStorage ledgerStorage;
+
+        LedgerStorageWriteTask(long ledgerId, int entryId, LedgerStorage 
ledgerStorage) {
+            this.ledgerId = ledgerId;
+            this.entryId = entryId;
+            this.ledgerStorage = ledgerStorage;
+        }
+
+        @Override
+        public Boolean call() {
+            try {
+                ledgerStorage.addEntry(generateEntry(ledgerId, entryId));
+            } catch (IOException e) {
+                LOG.error("Got Exception for AddEntry call. LedgerId: " + 
ledgerId + " entryId: " + entryId, e);
+                return false;
+            }
+            return true;
+        }
+    }
+
+    class LedgerStorageReadTask implements Callable<Boolean> {
+        long ledgerId;
+        int entryId;
+        LedgerStorage ledgerStorage;
+
+        LedgerStorageReadTask(long ledgerId, int entryId, LedgerStorage 
ledgerStorage) {
+            this.ledgerId = ledgerId;
+            this.entryId = entryId;
+            this.ledgerStorage = ledgerStorage;
+        }
+
+        @Override
+        public Boolean call() {
 
 Review comment:
   invokeAll returns list of Futures and join is method of CompletableFuture 
but not Future. 

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