sijie commented on a change in pull request #1281: Issue #570: Introducing
EntryLogManager.
URL: https://github.com/apache/bookkeeper/pull/1281#discussion_r181599453
##########
File path:
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/EntryLogger.java
##########
@@ -788,89 +810,392 @@ private long readLastLogId(File f) {
}
}
- /**
- * Flushes all rotated log channels. After log channels are flushed,
- * move leastUnflushedLogId ptr to current logId.
- */
- void checkpoint() throws IOException {
- flushRotatedLogs();
+ interface EntryLogManager {
+
+ /*
+ * add entry to the corresponding entrylog and return the position of
+ * the entry in the entrylog
+ */
+ long addEntry(long ledger, ByteBuf entry, boolean rollLog) throws
IOException;
+
+ /*
+ * gets the active logChannel with the given entryLogId. null if it is
+ * not existing.
+ */
+ BufferedLogChannel getCurrentLogIfPresent(long entryLogId);
+
+ /*
+ * Returns eligible writable ledger dir for the creation next entrylog
+ */
+ File getDirForNextEntryLog(List<File> writableLedgerDirs);
+
+ /*
+ * Do the operations required for checkpoint.
+ */
+ void checkpoint() throws IOException;
+
+ /*
+ * flush both current and rotated logs.
+ */
+ void flush() throws IOException;
+
+ /*
+ * close current logs.
+ */
+ void close() throws IOException;
+
+ /*
+ * force close current logs.
+ */
+ void forceClose();
+
/*
- * In the case of entryLogPerLedgerEnabled we need to flush both
- * rotatedlogs and currentlogs. This is needed because syncThread
- * periodically does checkpoint and at this time all the logs should
- * be flushed.
*
- * TODO: When EntryLogManager is introduced in the subsequent
sub-tasks of
- * this Issue, I will move this logic to individual implamentations of
- * EntryLogManager and it would be free of this booalen flag based
logic.
+ */
+ void prepareSortedLedgerStorageCheckpoint(long numBytesFlushed) throws
IOException;
+
+ /*
+ * this method should be called before doing entrymemtable flush, it
+ * would save the state of the entrylogger before entrymemtable flush
+ * and commitEntryMemTableFlush would take appropriate action after
+ * entrymemtable flush.
+ */
+ void prepareEntryMemTableFlush();
+
+ /*
+ * this method should be called after doing entrymemtable flush,it
would
+ * take appropriate action after entrymemtable flush depending on the
+ * current state of the entrylogger and the state of the entrylogger
+ * during prepareEntryMemTableFlush.
+ *
+ * It is assumed that there would be corresponding
+ * prepareEntryMemTableFlush for every commitEntryMemTableFlush and
both
+ * would be called from the same thread.
*
+ * returns boolean value indicating whether EntryMemTable should do
checkpoint
+ * after this commit method.
*/
- if (entryLogPerLedgerEnabled) {
- flushCurrentLog();
- }
+ boolean commitEntryMemTableFlush() throws IOException;
}
- void flushRotatedLogs() throws IOException {
- List<BufferedLogChannel> channels = null;
- long flushedLogId = INVALID_LID;
- synchronized (this) {
- channels = logChannelsToFlush;
- logChannelsToFlush = null;
+ abstract class EntryLogManagerBase implements EntryLogManager {
+ final List<BufferedLogChannel> rotatedLogChannels;
+
+ EntryLogManagerBase() {
+ rotatedLogChannels = new
CopyOnWriteArrayList<BufferedLogChannel>();
Review comment:
based on my understanding, you will use Set for per-ledger manager. why not
move `rotatedLogChannels` to single-log manager, and keep the original logic
unchanged? because I am not convinced that we need to change this to
`CopyOnWriteArrayList`.
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