sijie commented on a change in pull request #1281: Issue #570: Introducing
EntryLogManager.
URL: https://github.com/apache/bookkeeper/pull/1281#discussion_r179294075
##########
File path:
bookkeeper-server/src/main/java/org/apache/bookkeeper/bookie/EntryLogger.java
##########
@@ -802,88 +881,230 @@ private long readLastLogId(File f) {
}
}
+ interface EntryLogManager {
+ /*
+ * acquire lock for this ledger.
+ */
+ void acquireLock(Long ledgerId);
+
+ /*
+ * acquire lock for this ledger if it is not already available for this
+ * ledger then it will create a new one and then acquire lock.
+ */
+ void acquireLockByCreatingIfRequired(Long ledgerId);
+
+ /*
+ * release lock for this ledger
+ */
+ void releaseLock(Long ledgerId);
+
+ /*
+ * sets the logChannel for the given ledgerId. The previous one will be
+ * removed from replicaOfCurrentLogChannels. Previous logChannel will
be
+ * added to rotatedLogChannels.
+ */
+ void setCurrentLogForLedger(Long ledgerId, BufferedLogChannel
logChannel);
+
+ /*
+ * gets the logChannel for the given ledgerId.
+ */
+ BufferedLogChannel getCurrentLogForLedger(Long ledgerId);
+
+ /*
+ * gets the copy of rotatedLogChannels
+ */
+ Set<BufferedLogChannel> getCopyOfRotatedLogChannels();
+
+ /*
+ * gets the copy of replicaOfCurrentLogChannels
+ */
+ Set<BufferedLogChannel> getCopyOfCurrentLogs();
+
+ /*
+ * gets the active logChannel with the given entryLogId. null if it is
+ * not existing.
+ */
+ BufferedLogChannel getCurrentLogIfPresent(long entryLogId);
+
+ /*
+ * removes the logChannel from rotatedLogChannels collection
+ */
+ void removeFromRotatedLogChannels(BufferedLogChannel
rotatedLogChannelToRemove);
+
+ /*
+ * 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;
+
+ /*
+ * roll entryLogs.
+ */
+ void rollLogs() throws IOException;
+
+ /*
+ * gets the log id of the current activeEntryLog. for
+ * EntryLogManagerForSingleEntryLog it returns logid of current
+ * activelog, for EntryLogManagerForEntryLogPerLedger it would return
+ * some constant value.
+ */
+ long getCurrentLogId();
+ }
+
+ class EntryLogManagerForSingleEntryLog implements EntryLogManager {
+
+ private volatile BufferedLogChannel activeLogChannel;
+ private Lock lockForActiveLogChannel;
+ private final Set<BufferedLogChannel> rotatedLogChannels;
+
+ EntryLogManagerForSingleEntryLog() {
+ rotatedLogChannels = ConcurrentHashMap.newKeySet();
+ lockForActiveLogChannel = new ReentrantLock();
+ }
+
+ /*
+ * since entryLogPerLedger is not enabled, it is just one lock for all
+ * ledgers.
+ */
+ @Override
+ public void acquireLock(Long ledgerId) {
+ lockForActiveLogChannel.lock();
+ }
+
+ @Override
+ public void acquireLockByCreatingIfRequired(Long ledgerId) {
+ acquireLock(ledgerId);
+ }
+
+ @Override
+ public void releaseLock(Long ledgerId) {
+ lockForActiveLogChannel.unlock();
+ }
+
+ @Override
+ public void setCurrentLogForLedger(Long ledgerId, BufferedLogChannel
logChannel) {
+ acquireLock(ledgerId);
+ try {
+ BufferedLogChannel hasToRotateLogChannel = activeLogChannel;
+ activeLogChannel = logChannel;
+ if (hasToRotateLogChannel != null) {
+ rotatedLogChannels.add(hasToRotateLogChannel);
+ }
+ } finally {
+ releaseLock(ledgerId);
+ }
+ }
+
+ @Override
+ public BufferedLogChannel getCurrentLogForLedger(Long ledgerId) {
+ return activeLogChannel;
+ }
+
+ @Override
+ public Set<BufferedLogChannel> getCopyOfRotatedLogChannels() {
+ return new HashSet<BufferedLogChannel>(rotatedLogChannels);
+ }
+
+ @Override
+ public Set<BufferedLogChannel> getCopyOfCurrentLogs() {
+ HashSet<BufferedLogChannel> copyOfCurrentLogs = new
HashSet<BufferedLogChannel>();
+ copyOfCurrentLogs.add(activeLogChannel);
+ return copyOfCurrentLogs;
+ }
+
+ @Override
+ public BufferedLogChannel getCurrentLogIfPresent(long entryLogId) {
+ BufferedLogChannel activeLogChannelTemp = activeLogChannel;
+ if ((activeLogChannelTemp != null) &&
(activeLogChannelTemp.getLogId() == entryLogId)) {
+ return activeLogChannelTemp;
+ }
+ return null;
+ }
+
+ @Override
+ public void removeFromRotatedLogChannels(BufferedLogChannel
rotatedLogChannelToRemove) {
+ rotatedLogChannels.remove(rotatedLogChannelToRemove);
+ }
+
+ @Override
+ public File getDirForNextEntryLog(List<File> writableLedgerDirs) {
+ Collections.shuffle(writableLedgerDirs);
+ return writableLedgerDirs.get(0);
+ }
+
+ @Override
+ public void checkpoint() throws IOException {
+ flushRotatedLogs();
+ }
+
+ @Override
+ public void rollLogs() throws IOException {
+ createNewLog(INVALID_LEDGERID);
+ }
+
+ @Override
+ public long getCurrentLogId() {
+ return activeLogChannel.getLogId();
+ }
+ }
+
/**
* Flushes all rotated log channels. After log channels are flushed,
* move leastUnflushedLogId ptr to current logId.
*/
void checkpoint() throws IOException {
- flushRotatedLogs();
- /*
- * 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.
- *
- */
- if (entryLogPerLedgerEnabled) {
- flushCurrentLog();
- }
+ entryLogManager.checkpoint();
}
void flushRotatedLogs() throws IOException {
- List<BufferedLogChannel> channels = null;
- long flushedLogId = INVALID_LID;
- synchronized (this) {
- channels = logChannelsToFlush;
- logChannelsToFlush = null;
- }
+ Set<BufferedLogChannel> channels =
entryLogManager.getCopyOfRotatedLogChannels();
if (null == channels) {
return;
}
- Iterator<BufferedLogChannel> chIter = channels.iterator();
- while (chIter.hasNext()) {
- BufferedLogChannel channel = chIter.next();
- try {
- channel.flushAndForceWrite(false);
- } catch (IOException ioe) {
- // rescue from flush exception, add unflushed channels back
- synchronized (this) {
- if (null == logChannelsToFlush) {
- logChannelsToFlush = channels;
- } else {
- logChannelsToFlush.addAll(0, channels);
- }
- }
- throw ioe;
- }
- // remove the channel from the list after it is successfully
flushed
- chIter.remove();
+ for (BufferedLogChannel channel : channels) {
+ channel.flushAndForceWrite(true);
// since this channel is only used for writing, after flushing the
channel,
// we had to close the underlying file channel. Otherwise, we
might end up
// leaking fds which cause the disk spaces could not be reclaimed.
closeFileChannel(channel);
- if (channel.getLogId() > flushedLogId) {
- flushedLogId = channel.getLogId();
- }
+
recentlyCreatedEntryLogsStatus.flushRotatedEntryLog(channel.getLogId());
+ entryLogManager.removeFromRotatedLogChannels(channel);
LOG.info("Synced entry logger {} to disk.", channel.getLogId());
}
- // move the leastUnflushedLogId ptr
- leastUnflushedLogId = flushedLogId + 1;
}
public void flush() throws IOException {
+ flushCurrentLogs();
Review comment:
why you change the sequence here?
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