com.sleepycat.je.log

Class UtilizationFileReader

java.lang.Object

com.sleepycat.je.log.FileReader

com.sleepycat.je.log.UtilizationFileReader

public class UtilizationFileReader
extends FileReader

Summarizes the utilized and unutilized portion of each log file by examining each log entry. Does not use the Cleaner UtilizationProfile information in order to provide a second measure against which to evaluation the UtilizationProfile accuracy. Limitations =========== BINDeltas are all considered obsolete, because we would have to model the Btree differently to count them accurately. We would need the ability to lookup an IN by LSN, since the delta does not contain the node ID. Holds memory for all active LNs, i.e., a duplication of what is in the Btree. Holds memory for txns with no abort or commit entry until the end of the run. Could consider these txns to be aborted when a recovery is encountered, if we can recognize a recovery. Relies on the live Btree to get Database information -- whether dups are configured and whether the database is deleted -- rather than reading the log, which would require a separate initial pass. Because of cleaner migration, we can't rely on a database's MapLN preceding the other log entries in the database.

Nested Class Summary

Nested classes/interfaces inherited from class com.sleepycat.je.log.FileReader

FileReader.EOFException, FileReader.ReadWindow

Field Summary

Fields inherited from class com.sleepycat.je.log.FileReader

cksumValidator, currentEntryHeader, currentEntryOffset, currentEntryPrevOffset, envImpl, eof, fileManager, forward, logger, nextEntryOffset, startLsn, window

Method Summary

Methods

Modifier and Type	Method and Description
static java.util.Map<java.lang.Long,FileSummary>	calcFileSummaryMap(EnvironmentImpl envImpl) Creates a UtilizationReader, reads the log, and returns the resulting Map of Long file number to FileSummary.
protected boolean	isTargetEntry()
protected boolean	processEntry(java.nio.ByteBuffer entryBuffer) Each file reader implements this method to process the entry data.

Methods inherited from class com.sleepycat.je.log.FileReader

entryIsReplicated, getAndResetNReads, getLastEntrySize, getLastLsn, getNRepeatIteratorReads, getNumRead, initStartingPosition, makeWindow, readNextEntry, readNextEntryAllowExceptions, resyncReader, setAlwaysValidateChecksum, setBackwardPosition, setForwardPosition, skipData, skipEntry, threadSafeBufferFlip, threadSafeBufferPosition, threadSafeBufferPosition

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isTargetEntry

protected boolean isTargetEntry()

Overrides:

isTargetEntry in class FileReader

Returns:

true if this reader should process this entry, or just skip over it.

processEntry

protected boolean processEntry(java.nio.ByteBuffer entryBuffer)
                        throws DatabaseException

Description copied from class: FileReader

Each file reader implements this method to process the entry data.

Specified by:

processEntry in class FileReader

Parameters:

entryBuffer - contains the entry data and is positioned at the data

Returns:

true if this entry should be returned

Throws:

DatabaseException

calcFileSummaryMap

public static java.util.Map<java.lang.Long,FileSummary> calcFileSummaryMap(EnvironmentImpl envImpl)

Creates a UtilizationReader, reads the log, and returns the resulting Map of Long file number to FileSummary.