ivankelly commented on a change in pull request #1228: Issue #570: Move logic
of unpersistedbytes to bufferedchannel
URL: https://github.com/apache/bookkeeper/pull/1228#discussion_r172447036
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File path:
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/BufferedChannel.java
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@@ -138,6 +182,20 @@ public long forceWrite(boolean forceMetadata) throws
IOException {
// the force write, any flush that happens after this may or may
// not be flushed
long positionForceWrite = writeBufferStartPosition.get();
+ /*
+ * since forceWrite method is not called in synchronized block, to make
+ * sure we are not undercounting unpersistedBytes, setting
+ * unpersistedBytes to the current number of bytes in writeBuffer.
+ *
+ * since we are calling fileChannel.force, bytes which are written to
+ * filechannel (system filecache) will be persisted to the disk. So we
+ * dont need to consider those bytes for setting value to
+ * unpersistedBytes.
+ *
+ */
+ synchronized (this) {
+ unpersistedBytes.set(writeBuffer.readableBytes());
Review comment:
ok, maybe add a comment that unpersistedBytes may overreport, but that's ok.
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