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Subject [GitHub] [hadoop] steveloughran commented on a change in pull request #802: HADOOP-16279. S3Guard: Implement time-based (TTL) expiry for entries …
Date Fri, 31 May 2019 18:39:26 GMT
steveloughran commented on a change in pull request #802: HADOOP-16279. S3Guard: Implement
time-based (TTL) expiry for entries …
URL: https://github.com/apache/hadoop/pull/802#discussion_r289507979
 
 

 ##########
 File path: hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/ITtlTimeProvider.java
 ##########
 @@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.fs.s3a.s3guard;
+
+/**
+ * This interface is defined for handling TTL expiry of metadata in S3Guard.
+ *
+ * TTL can be tested by implementing this interface and setting is as
+ * {@code S3Guard.ttlTimeProvider}. By doing this, getNow() can return any
+ * value preferred and flaky tests could be avoided.
+ */
+public interface ITtlTimeProvider {
+  long getNow();
 
 Review comment:
   Highlight what "now" is meant to be? Time in the epoc? In seconds? Millis? Alternatively,
have it return a ZonedDateTime value and remove all ambiguity

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