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_r167127930
##########
File path:
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/EntryLogger.java
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@@ -1094,24 +1259,25 @@ 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;
+ BufferedReadChannel brc = getFromChannels(entryLogId);
+ if (brc != null) {
+ return brc;
+ }
+ FileChannelBackingCache.CachedFileChannel cachedFileChannel = null;
+ try {
+ do {
+ cachedFileChannel =
logid2FileChannel.loadFileChannel(entryLogId);
+ } while (!cachedFileChannel.tryRetain());
+ } finally {
+ if (null != cachedFileChannel) {
+ cachedFileChannel.release();
Review comment:
`loadFileChannel` and `tryRetain` both add one reference count, so releasing
one is necessary.
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