[GitHub] [accumulo] ctubbsii commented on a change in pull request #1462: Temporarily cache existence of recovery wals

[GitBox <gi...@apache.org>]

ctubbsii commented on a change in pull request #1462: Temporarily cache existence of recovery wals
URL: https://github.com/apache/accumulo/pull/1462#discussion_r359075230
 
 

 ##########
 File path: server/master/src/main/java/org/apache/accumulo/master/recovery/RecoveryManager.java
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 @@ -132,6 +148,19 @@ private void initiateSort(String sortId, String source, final String destination
     log.info("Created zookeeper entry " + path + " with data " + work);
   }
 
+  private boolean exists(final Path path) throws IOException {
+    try {
+      return existenceCache.get(path, new Callable<Boolean>() {
+        @Override
+        public Boolean call() throws Exception {
+          return master.getFileSystem().exists(path);
+        }
+      });
 
 Review comment:
   Callable is also a functional interface:
   
   ```java
   return existenceCache.get(path, () -> master.getFileSystem().exists(path));
   ```

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