sijie 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_r156465690
##########
File path:
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/EntryLogger.java
##########
@@ -1079,24 +1109,26 @@ 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;
}
+
+ // logid2FileChannel cache will load fileChannel automatically
+ FileChannel fc = null;
+ try {
+ fc = logid2FileChannel.get(entryLogId);
+ } catch (ExecutionException e){
+ LOG.error("ExecutionException found in get fileChannel for log {}
in logid2FileChannel cache", entryLogId);
+ // throw exception to avoid pass null to BufferedReadChannel
+ throw new IOException(e);
Review comment:
ExecutionException wrap the actual cause on loading the file channel. so you
need to unwrap this.
```
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
} else {
throw new IOException("Encountered unknown exception on opening read
channel for entry log " + entryLogId, e.getCause());
}
```
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