ArvinDevel commented on a change in pull request #832: Issue 620: Close the
fileChannels for read when they are idle
URL: https://github.com/apache/bookkeeper/pull/832#discussion_r172122411
##########
File path:
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/EntryLogger.java
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@@ -1094,25 +1104,40 @@ private Header getHeaderForLogId(long entryLogId)
throws IOException {
}
}
- private BufferedReadChannel getChannelForLogId(long entryLogId) throws
IOException {
- BufferedReadChannel fc = getFromChannels(entryLogId);
- if (fc != null) {
- return fc;
- }
- File file = findFile(entryLogId);
- // get channel is used to open an existing entry log file
- // it would be better to open using read mode
- FileChannel newFc = new RandomAccessFile(file, "r").getChannel();
- FileChannel oldFc = logid2FileChannel.putIfAbsent(entryLogId, newFc);
- if (null != oldFc) {
- newFc.close();
- newFc = oldFc;
- }
- // We set the position of the write buffer of this buffered channel to
Long.MAX_VALUE
- // so that there are no overlaps with the write buffer while reading
- fc = new BufferedReadChannel(newFc, conf.getReadBufferBytes());
- putInReadChannels(entryLogId, fc);
- return fc;
+ /**
+ * Add one refCnt for BufferedReadChannel and return it, caller need to
subtract one refCnt.
+ * @param entryLogId
+ * @return
+ * @throws IOException
+ */
+ private EntryLogBufferedReadChannel getChannelForLogId(long entryLogId)
throws IOException {
+ try {
+ EntryLogBufferedReadChannel brc;
+ Callable<EntryLogBufferedReadChannel> loader = () -> {
Review comment:
A better improvement, I have fixed it.
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