/** @see LN#writeToLog */
public void writeToLog(ByteBuffer logBuffer) {
/*
* Add the tracked (live) summary to the base summary before writing it
* to the log, and reset the tracked summary. Do this even when
* deleting the LN, so that the tracked summary is cleared.
*/
if (trackedSummary != null) {
baseSummary.add(trackedSummary);
if (!isDeleted()) {
getOffsets();
}
/* Reset the totals to zero and clear the tracked offsets. */
trackedSummary.reset();
}
super.writeToLog(logBuffer);
if (!isDeleted()) {
baseSummary.writeToLog(logBuffer);
obsoleteOffsets.writeToLog(logBuffer);
}
}
/** If tracked offsets may be present, get them so they are ready to be written to the log. */
private void getOffsets() {
if (needOffsets) {
long[] offsets = trackedSummary.getObsoleteOffsets();
if (offsets != null) {
int oldSize = obsoleteOffsets.getExtraMemorySize();
obsoleteOffsets.pack(offsets);
int newSize = obsoleteOffsets.getExtraMemorySize();
memBudget.updateTreeMemoryUsage(newSize - oldSize);
}
needOffsets = false;
}
}
/**
* This reader looks at all nodes for the max node id and database id. It only returns
* non-provisional INs and IN delete entries.
*/
protected boolean processEntry(ByteBuffer entryBuffer) throws DatabaseException {
boolean useEntry = false;
boolean entryLoaded = false;
/* If this is a targetted entry, read the entire log entry. */
if (targetLogEntry != null) {
targetLogEntry.readEntry(entryBuffer, currentEntrySize, currentEntryTypeVersion, true);
DatabaseId dbId = getDatabaseId();
boolean isMapDb = dbId.equals(DbTree.ID_DB_ID);
useEntry = (!mapDbOnly || isMapDb);
entryLoaded = true;
}
/* Do a partial load during tracking if necessary. */
if (trackIds) {
/*
* Do partial load of db and txn id tracking entries if necessary.
* Note that these entries do not overlap with targetLogEntry.
*
* XXX We're doing a full load for now, since LNLogEntry does not
* read the db and txn id in a partial load, only the node id.
*/
LNLogEntry lnEntry = null;
if (dbIdTrackingEntry != null) {
/* This entry has a db id */
lnEntry = dbIdTrackingEntry;
lnEntry.readEntry(
entryBuffer, currentEntrySize, currentEntryTypeVersion, true /* full load */);
entryLoaded = true;
MapLN mapLN = (MapLN) lnEntry.getMainItem();
int dbId = mapLN.getDatabase().getId().getId();
if (dbId > maxDbId) {
maxDbId = dbId;
}
}
if (txnIdTrackingEntry != null) {
/* This entry has a txn id */
if (lnEntry == null) {
lnEntry = txnIdTrackingEntry;
lnEntry.readEntry(
entryBuffer, currentEntrySize, currentEntryTypeVersion, true /* full load */);
entryLoaded = true;
}
long txnId = lnEntry.getTxnId().longValue();
if (txnId > maxTxnId) {
maxTxnId = txnId;
}
}
/*
* Perform utilization counting under trackIds to prevent
* double-counting.
*/
if (fsTrackingEntry != null) {
/* Must do full load to get key from file summary LN. */
if (!entryLoaded) {
nodeTrackingEntry.readEntry(
entryBuffer, currentEntrySize, currentEntryTypeVersion, true /* full load */);
entryLoaded = true;
}
/*
* When a FileSummaryLN is encountered, reset the tracked
* summary for that file to replay what happens when a
* FileSummaryLN log entry is written.
*/
byte[] keyBytes = fsTrackingEntry.getKey();
FileSummaryLN fsln = (FileSummaryLN) fsTrackingEntry.getMainItem();
long fileNum = fsln.getFileNumber(keyBytes);
TrackedFileSummary trackedLN = tracker.getTrackedFile(fileNum);
if (trackedLN != null) {
trackedLN.reset();
}
/* Save the LSN of the FileSummaryLN for use by undo/redo. */
fileSummaryLsns.put(new Long(fileNum), new Long(getLastLsn()));
/*
* SR 10395: Do not cache the file summary in the
* UtilizationProfile here, since it may be for a deleted log
* file.
*/
}
/*
* Do partial load of nodeTrackingEntry (and inTrackingEntry) if not
* already loaded. We only need the node id.
*/
if (nodeTrackingEntry != null) {
if (!entryLoaded) {
nodeTrackingEntry.readEntry(
entryBuffer, currentEntrySize, currentEntryTypeVersion, false /* partial load */);
entryLoaded = true;
}
/* Keep track of the largest node id seen. */
long nodeId = nodeTrackingEntry.getNodeId();
maxNodeId = (nodeId > maxNodeId) ? nodeId : maxNodeId;
}
if (inTrackingEntry != null) {
assert entryLoaded : "All nodes should have been loaded";
/*
* Count the obsolete LSN of the previous version, if available
* and if not already counted. Use inexact counting for two
* reasons: 1) we don't always have the full LSN because earlier
* log versions only had the file number, and 2) we can't
* guarantee obsoleteness for provisional INs.
*/
long oldLsn = inTrackingEntry.getObsoleteLsn();
if (oldLsn != DbLsn.NULL_LSN) {
long newLsn = getLastLsn();
if (!isObsoleteLsnAlreadyCounted(oldLsn, newLsn)) {
tracker.countObsoleteNodeInexact(oldLsn, fromLogType);
}
}
/*
* Count a provisional IN as obsolete if it follows
* partialCkptStart. It cannot have been already counted,
* because provisional INs are not normally counted as obsolete;
* they are only considered obsolete when they are part of a
* partial checkpoint.
*
* Depending on the exact point at which the checkpoint was
* aborted, this technique is not always accurate; therefore
* inexact counting must be used.
*/
if (isProvisional && partialCkptStart != DbLsn.NULL_LSN) {
oldLsn = getLastLsn();
if (DbLsn.compareTo(partialCkptStart, oldLsn) < 0) {
tracker.countObsoleteNodeInexact(oldLsn, fromLogType);
}
}
}
}
/* Return true if this entry should be processed */
return useEntry;
}