{"action":"created","comment":{"url":"https://api.github.com/repos/apache/bookkeeper/pulls/comments/171949862","pull_request_review_id":100890067,"id":171949862,"diff_hunk":"@@ -0,0 +1,190 @@\n+/*\n+ *\n+ * Licensed to the Apache Software Foundation (ASF) under one\n+ * or more contributor license agreements.  See the NOTICE file\n+ * distributed with this work for additional information\n+ * regarding copyright ownership.  The ASF licenses this file\n+ * to you under the Apache License, Version 2.0 (the\n+ * \"License\"); you may not use this file except in compliance\n+ * with the License.  You may obtain a copy of the License at\n+ *\n+ *   http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing,\n+ * software distributed under the License is distributed on an\n+ * \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n+ * KIND, either express or implied.  See the License for the\n+ * specific language governing permissions and limitations\n+ * under the License.\n+ *\n+ */\n+\n+package org.apache.bookkeeper.bookie;\n+\n+import static com.google.common.base.Preconditions.checkArgument;\n+import com.google.common.annotations.VisibleForTesting;\n+import java.io.File;\n+import java.io.IOException;\n+import java.io.RandomAccessFile;\n+import java.nio.channels.FileChannel;\n+import java.util.concurrent.ConcurrentHashMap;\n+import java.util.concurrent.atomic.AtomicInteger;\n+import java.util.concurrent.locks.ReentrantReadWriteLock;\n+import org.apache.bookkeeper.util.IOUtils;\n+import org.slf4j.Logger;\n+import org.slf4j.LoggerFactory;\n+\n+/**\n+ * FileChannelBackingCache used to cache RefCntFileChannels for read.\n+ * In order to avoid get released file, adopt design of FileInfoBackingCache.\n+ * @see FileInfoBackingCache\n+ */\n+class FileChannelBackingCache {\n+    private static final Logger LOG = LoggerFactory.getLogger(FileChannelBackingCache.class);\n+    static final int DEAD_REF = -0xdead;\n+    final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();\n+\n+    final FileLoader fileLoader;\n+\n+    FileChannelBackingCache(FileLoader fileLoader) {\n+        this.fileLoader = fileLoader;\n+    }\n+\n+    final ConcurrentHashMap<Long, CachedFileChannel> fileChannels = new ConcurrentHashMap<>();\n+\n+    CachedFileChannel loadFileChannel(long logId) throws IOException {\n+        lock.readLock().lock();\n+        try {\n+            CachedFileChannel cachedFileChannel = fileChannels.get(logId);\n+            if (cachedFileChannel != null) {\n+                boolean retained = cachedFileChannel.tryRetain();\n+                checkArgument(retained);\n+                return cachedFileChannel;\n+            }\n+        } finally {\n+            lock.readLock().unlock();\n+        }\n+\n+        lock.writeLock().lock();\n+        try {\n+            File file = fileLoader.load(logId);\n+            // get channel is used to open an existing entry log file\n+            // it would be better to open using read mode\n+            FileChannel newFc = new RandomAccessFile(file, \"r\").getChannel();\n+            CachedFileChannel cachedFileChannel = new CachedFileChannel(logId, newFc);\n+            fileChannels.put(logId, cachedFileChannel);\n+            boolean retained = cachedFileChannel.tryRetain();\n+            checkArgument(retained);\n+            return cachedFileChannel;\n+        } finally {\n+            lock.writeLock().unlock();\n+        }\n+    }\n+\n+    /**\n+     * close FileChannel and remove from cache when possible.\n+     * @param logId\n+     * @param cachedFileChannel\n+     */\n+    private void releaseFileChannel(long logId, CachedFileChannel cachedFileChannel) {\n+        lock.writeLock().lock();","path":"bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/FileChannelBackingCache.java","position":90,"original_position":90,"commit_id":"c30de042ca5de5968ee2b2ce7e92cd674dc7f8ae","original_commit_id":"c30de042ca5de5968ee2b2ce7e92cd674dc7f8ae","user":{"login":"sijie","id":1217863,"avatar_url":"https://avatars2.githubusercontent.com/u/1217863?v=4","gravatar_id":"","url":"https://api.github.com/users/sijie","html_url":"https://github.com/sijie","followers_url":"https://api.github.com/users/sijie/followers","following_url":"https://api.github.com/users/sijie/following{/other_user}","gists_url":"https://api.github.com/users/sijie/gists{/gist_id}","starred_url":"https://api.github.com/users/sijie/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sijie/subscriptions","organizations_url":"https://api.github.com/users/sijie/orgs","repos_url":"https://api.github.com/users/sijie/repos","events_url":"https://api.github.com/users/sijie/events{/privacy}","received_events_url":"https://api.github.com/users/sijie/received_events","type":"User","site_admin":false},"body":"same here, I am not sure why we are closing a file channel under a write lock.\r\n\r\nso the question is what does `lock` is actually locking.","created_at":"2018-03-02T20:04:19Z","updated_at":"2018-03-02T20:14:14Z","html_url":"https://github.com/apache/bookkeeper/pull/832#discussion_r171949862","pull_request_url":"https://api.github.com/repos/apache/bookkeeper/pulls/832","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/bookkeeper/pulls/comments/171949862"},"html":{"href":"https://github.com/apache/bookkeeper/pull/832#discussion_r171949862"},"pull_request":{"href":"https://api.github.com/repos/apache/bookkeeper/pulls/832"}}},"pull_request":{"url":"https://api.github.com/repos/apache/bookkeeper/pulls/832","id":157732350,"html_url":"https://github.com/apache/bookkeeper/pull/832","diff_url":"https://github.com/apache/bookkeeper/pull/832.diff","patch_url":"https://github.com/apache/bookkeeper/pull/832.patch","issue_url":"https://api.github.com/repos/apache/bookkeeper/issues/832","number":832,"state":"open","locked":false,"title":"Issue 620: Close the fileChannels for read when they are idle","user":{"login":"ArvinDevel","id":16100052,"avatar_url":"https://avatars1.githubusercontent.com/u/16100052?v=4","gravatar_id":"","url":"https://api.github.com/users/ArvinDevel","html_url":"https://github.com/ArvinDevel","followers_url":"https://api.github.com/users/ArvinDevel/followers","following_url":"https://api.github.com/users/ArvinDevel/following{/other_user}","gists_url":"https://api.github.com/users/ArvinDevel/gists{/gist_id}","starred_url":"https://api.github.com/users/ArvinDevel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ArvinDevel/subscriptions","organizations_url":"https://api.github.com/users/ArvinDevel/orgs","repos_url":"https://api.github.com/users/ArvinDevel/repos","events_url":"https://api.github.com/users/ArvinDevel/events{/privacy}","received_events_url":"https://api.github.com/users/ArvinDevel/received_events","type":"User","site_admin":false},"body":"Descriptions of the changes in this PR:\r\n\r\nuse guava cache to replace concurrentMap for logid2fileChannel, as guava cache has a eviction way, so we can use it to close the idle fileChannel\r\n\r\nMaster Issue: #620 \r\n\r\n> ---\r\n> Be sure to do all of the following to help us incorporate your contribution\r\n> quickly and easily:\r\n>\r\n> If this PR is a BookKeeper Proposal (BP):\r\n>\r\n> - [ ] Make sure the PR title is formatted like:\r\n>     `<BP-#>: Description of bookkeeper proposal`\r\n>     `e.g. BP-1: 64 bits ledger is support`\r\n> - [ ] Attach the master issue link in the description of this PR.\r\n> - [ ] Attach the google doc link if the BP is written in Google Doc.\r\n>\r\n> Otherwise:\r\n> \r\n> - [ ] Make sure the PR title is formatted like:\r\n>     `<Issue # or BOOKKEEPER-#>: Description of pull request`\r\n>     `e.g. Issue 123: Description ...`\r\n>     `e.g. BOOKKEEPER-1234: Description ...`\r\n> - [ ] Make sure tests pass via `mvn clean apache-rat:check install findbugs:check`.\r\n> - [ ] Replace `<Issue # or BOOKKEEPER-#>` in the title with the actual Issue/JIRA number.\r\n> \r\n> ---\r\n","created_at":"2017-12-12T04:05:46Z","updated_at":"2018-03-02T20:14:14Z","closed_at":null,"merged_at":null,"merge_commit_sha":"dbeb995466e9f1a5961c1c28a8eb3cce939f93b1","assignee":{"login":"ArvinDevel","id":16100052,"avatar_url":"https://avatars1.githubusercontent.com/u/16100052?v=4","gravatar_id":"","url":"https://api.github.com/users/ArvinDevel","html_url":"https://github.com/ArvinDevel","followers_url":"https://api.github.com/users/ArvinDevel/followers","following_url":"https://api.github.com/users/ArvinDevel/following{/other_user}","gists_url":"https://api.github.com/users/ArvinDevel/gists{/gist_id}","starred_url":"https://api.github.com/users/ArvinDevel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ArvinDevel/subscriptions","organizations_url":"https://api.github.com/users/ArvinDevel/orgs","repos_url":"https://api.github.com/users/ArvinDevel/repos","events_url":"https://api.github.com/users/ArvinDevel/events{/privacy}","received_events_url":"https://api.github.com/users/ArvinDevel/received_events","type":"User","site_admin":false},"assignees":[{"login":"ArvinDevel","id":16100052,"avatar_url":"https://avatars1.githubusercontent.com/u/16100052?v=4","gravatar_id":"","url":"https://api.github.com/users/ArvinDevel","html_url":"https://github.com/ArvinDevel","followers_url":"https://api.github.com/users/ArvinDevel/followers","following_url":"https://api.github.com/users/ArvinDevel/following{/other_user}","gists_url":"https://api.github.com/users/ArvinDevel/gists{/gist_id}","starred_url":"https://api.github.com/users/ArvinDevel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ArvinDevel/subscriptions","organizations_url":"https://api.github.com/users/ArvinDevel/orgs","repos_url":"https://api.github.com/users/ArvinDevel/repos","events_url":"https://api.github.com/users/ArvinDevel/events{/privacy}","received_events_url":"https://api.github.com/users/ArvinDevel/received_events","type":"User","site_admin":false}],"requested_reviewers":[],"requested_teams":[],"labels":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/bookkeeper/pulls/832/commits","review_comments_url":"https://api.github.com/repos/apache/bookkeeper/pulls/832/comments","review_comment_url":"https://api.github.com/repos/apache/bookkeeper/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/bookkeeper/issues/832/comments","statuses_url":"https://api.github.com/repos/apache/bookkeeper/statuses/c30de042ca5de5968ee2b2ce7e92cd674dc7f8ae","head":{"label":"ArvinDevel:issue620","ref":"issue620","sha":"c30de042ca5de5968ee2b2ce7e92cd674dc7f8ae","user":{"login":"ArvinDevel","id":16100052,"avatar_url":"https://avatars1.githubusercontent.com/u/16100052?v=4","gravatar_id":"","url":"https://api.github.com/users/ArvinDevel","html_url":"https://github.com/ArvinDevel","followers_url":"https://api.github.com/users/ArvinDevel/followers","following_url":"https://api.github.com/users/ArvinDevel/following{/other_user}","gists_url":"https://api.github.com/users/ArvinDevel/gists{/gist_id}","starred_url":"https://api.github.com/users/ArvinDevel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ArvinDevel/subscriptions","organizations_url":"https://api.github.com/users/ArvinDevel/orgs","repos_url":"https://api.github.com/users/ArvinDevel/repos","events_url":"https://api.github.com/users/ArvinDevel/events{/privacy}","received_events_url":"https://api.github.com/users/ArvinDevel/received_events","type":"User","site_admin":false},"repo":{"id":100607168,"name":"bookkeeper","full_name":"ArvinDevel/bookkeeper","owner":{"login":"ArvinDevel","id":16100052,"avatar_url":"https://avatars1.githubusercontent.com/u/16100052?v=4","gravatar_id":"","url":"https://api.github.com/users/ArvinDevel","html_url":"https://github.com/ArvinDevel","followers_url":"https://api.github.com/users/ArvinDevel/followers","following_url":"https://api.github.com/users/ArvinDevel/following{/other_user}","gists_url":"https://api.github.com/users/ArvinDevel/gists{/gist_id}","starred_url":"https://api.github.com/users/ArvinDevel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ArvinDevel/subscriptions","organizations_url":"https://api.github.com/users/ArvinDevel/orgs","repos_url":"https://api.github.com/users/ArvinDevel/repos","events_url":"https://api.github.com/users/ArvinDevel/events{/privacy}","received_events_url":"https://api.github.com/users/ArvinDevel/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/ArvinDevel/bookkeeper","description":"Apache 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