Modifier and Type	Class and Description
private static class	IndexStatisticsDaemonImpl.KeyComparator Support class used to compare keys when scanning indexes.

Field Summary

Modifier and Type	Field and Description
private static final boolean	AS_BACKGROUND_TASK
private static final boolean	AS_EXPLICIT_TASK
private final ContextManager	ctxMgr The context manager for the worker thread.
private boolean	daemonDisabled Tells if the daemon has been disabled.
private LanguageConnectionContext	daemonLCC The language connection context for the worker thread.
private final String	databaseName
private final Database	db The database object for the database we are handling automatic index statistics update for.
private final String	dbOwner The name of the database owner.
private final boolean	doLog Tells if logging is enabled.
private final boolean	doTrace Tells if tracing is enabled.
private int	errorsConsecutive Number of consecutive errors, used as a metric to decide if the damoen should be automatically shut down.
private long	errorsKnown
private long	errorsUnknown
private final HeaderPrintWriter	logStream
private static final int	MAX_QUEUE_LENGTH Maximum number of work units allowed in the queue.
private final ArrayList<TableDescriptor>	queue A list of tables that shall have their index statistics updated.
private Thread	runningThread The thread in which the index statistics refresh operation is being executed, if any.
private long	runTime The period of time (ms) for which the daemon has been doing active work.
public final boolean	skipDisposableStats Tells if disposable stats should be generated, which will happen in soft-upgrade mode or when the user asks us to revert to the old behavior.
private final long	timeOfCreation Specifies when the daemon was created.
private final boolean	traceToDerbyLog Tells if traces are written to the Derby log file.
private final boolean	traceToStdOut Tells if traces are written to standard out.
private final StringBuffer	tsb
private long	wuProcessed
private long	wuRejectedDup
private long	wuRejectedFQ
private long	wuRejectedOther
private long	wuScheduled

Constructor Summary

Access	Constructor and Description
public	IndexStatisticsDaemonImpl(HeaderPrintWriter the log to write to log, boolean whether to log activity information doLog, String whether, and to where, trace information should be written ("off\|log\|stdout\|both") traceLevel, Database the database ("off\|log\|stdout\|both") db, String the name of the database owner userName, String the name of the database (not stored in the db obj) databaseName) Creates a new daemon.

Access

Constructor and Description

public

IndexStatisticsDaemonImpl(HeaderPrintWriter

the log to write to

log, boolean

whether to log activity information

doLog, String

whether, and to where, trace information should be written ("off|log|stdout|both")

traceLevel, Database

the database ("off|log|stdout|both")

db, String

the name of the database owner

userName, String

the name of the database (not stored in the db obj)

databaseName)

Creates a new daemon.

Method Summary

Modifier and Type	Method and Description
private boolean	Returns: `true` if work can be accepted, `false` if not. acceptWork(TableDescriptor the table descriptor to check td) Determines if the given work can be accepted.
private void	appendRunStats(StringBuffer the string buffer to append to sb) Appends runtime statistics to the given string buffer.
private static String	Returns: A string. cardToStr(long[] index cardinality cardinality) Produces a textual representation of the cardinality numbers.
private boolean	dbAtLeast10_9(Database db) Tells if the database is 10.9 or newer.
private static String	extractIstatInfo(Throwable t) Purely for debugging, to avoid printing too much info.
private static String	fmtScanTimes(long[][] timings) Format array of scan durations as a string.
private void	generateStatistics(LanguageConnectionContext connection context to use to perform the work lcc, TableDescriptor target base table descriptor td) Generates index statistics for all indexes associated with the given table descriptor.
private static ContextService	getContextService() Must be private so that user code can't call this entry point.
private boolean	Returns: `true` if the error was handled, `false` otherwise handleExpectedErrors(TableDescriptor td, StandardException the exception to handle se) Handles expected errors.
private boolean	Returns: `true` if the error was handled, `false` otherwise handleFatalErrors(ContextManager context manager cm, StandardException the exception to handle se) Handles fatal errors that will cause the daemon to be shut down.
private boolean	Returns: `true` if the error was handled, `false` otherwise handleUnexpectedErrors(TableDescriptor td, StandardException the exception to handle se) Handles unexpected errors.
private void	invalidateStatements(LanguageConnectionContext connection context to use to perform the work lcc, TableDescriptor the table to invalidate for td, boolean whether the update is done automatically as part of a background task or if explicitly invoked by the user asBackgroundTask) Performs an invalidation action for the given table (the event being statistics update).
private boolean	isShuttingDown() Return true if we are being shutdown
private void	log(boolean asBackgroundTask, TableDescriptor td, String msg)
private void	log(boolean `true` if logging for the background daemon automatically updating stats, `false` if not asBackgroundTask, TableDescriptor current table descriptor being worked on, may be `null` td, Throwable raised error, may be `null` t, String the message to log msg) Logs the information given.
private void	logAlways(TableDescriptor current table descriptor being worked on, may be `null` td, Throwable raised error, may be `null` t, String the message to log msg) Logs the information given.
private void	processingLoop() Main processing loop which will compute statistics until the queue of scheduled work units has been drained.
public void	run() Implements java.lang.Runnable.run. Drives the statistics generation.
public void	runExplicitly(LanguageConnectionContext connection context to use to perform the work lcc, TableDescriptor the base table td, ConglomerateDescriptor[] the indexes to update (non-index conglomerates are ignored) cds, String the context in which the operation is run (i.e. 'ALTER TABLE', may be `null`) runContext) Implements org.apache.derby.iapi.services.daemon.IndexStatisticsDaemon.runExplicitly. Runs the statistics update sequence explicitly as requested by the user.
public void	schedule(TableDescriptor base table descriptor to update index statistics for td) Implements org.apache.derby.iapi.services.daemon.IndexStatisticsDaemon.schedule. Schedules an update of the index statistics for the specified table.
private void	setHeapRowEstimate(TransactionController transaction to use tc, long the heap table tableId, long estimate of number of rows in the table rowEstimate) Sets the row estimate for the heap conglomerate.
private static void	sleep(long target sleep time ms) Puts the current thread to sleep for maximum `ms` milliseconds.
public void	stop() Implements org.apache.derby.iapi.services.daemon.IndexStatisticsDaemon.stop. Stops the daemon.
private synchronized void	trace(int indentLevel, String msg)
private void	updateIndexStatsMinion(LanguageConnectionContext language connection context used to perform the work lcc, TableDescriptor the table to update index stats for td, ConglomerateDescriptor[] the conglomerates to update statistics for (non-index conglomerates will be ignored), `null` means all indexes cds, boolean whether the updates are done automatically as part of a background task or if explicitly invoked by the user asBackgroundTask) Updates the index statistics for the given table and the specified indexes.
private void	writeUpdatedStats(LanguageConnectionContext connection context to use to perform the work lcc, TableDescriptor the base table td, UUID the index of the base table index, long number of rows in the base table numRows, long[] the number of unique values in the index (per number of leading columns) cardinality, boolean whether the update is done automatically as part of a background task or if explicitly invoked by the user asBackgroundTask) Writes updated statistics for the specified index to the data dictionary.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

AS_BACKGROUND_TASK	back to summary
private static final boolean AS_BACKGROUND_TASK

AS_EXPLICIT_TASK	back to summary
private static final boolean AS_EXPLICIT_TASK

ctxMgr	back to summary
private final ContextManager ctxMgr The context manager for the worker thread.

daemonDisabled	back to summary
private boolean daemonDisabled Tells if the daemon has been disabled.

daemonLCC	back to summary
private LanguageConnectionContext daemonLCC The language connection context for the worker thread.

databaseName	back to summary
private final String databaseName

db	back to summary
private final Database db The database object for the database we are handling automatic index statistics update for.

dbOwner	back to summary
private final String dbOwner The name of the database owner.

doLog	back to summary
private final boolean doLog Tells if logging is enabled.

doTrace	back to summary
private final boolean doTrace Tells if tracing is enabled.

errorsConsecutive	back to summary
private int errorsConsecutive Number of consecutive errors, used as a metric to decide if the damoen should be automatically shut down.

errorsKnown	back to summary
private long errorsKnown

errorsUnknown	back to summary
private long errorsUnknown

logStream	back to summary
private final HeaderPrintWriter logStream

MAX_QUEUE_LENGTH	back to summary
private static final int MAX_QUEUE_LENGTH Maximum number of work units allowed in the queue.

queue	back to summary
private final ArrayList<TableDescriptor> queue A list of tables that shall have their index statistics updated. Note that the descriptor isn't removed before the work has been completed.

runningThread	back to summary
private Thread runningThread The thread in which the index statistics refresh operation is being executed, if any. Created as needed, but there will only be one thread doing the work. The thread is allowed to die since it is assumed that index statistics regeneration is rather infrequent.

runTime	back to summary
private long runTime The period of time (ms) for which the daemon has been doing active work.

skipDisposableStats	back to summary
public final boolean skipDisposableStats Tells if disposable stats should be generated, which will happen in soft-upgrade mode or when the user asks us to revert to the old behavior. Made public to allow access for CreateIndexConstantAction and FromBaseTable, but this is no longer necessary when the debug property to keep disposable statistics is removed.

skipDisposableStats

back to summary

public final boolean skipDisposableStats

Tells if disposable stats should be generated, which will happen in soft-upgrade mode or when the user asks us to revert to the old behavior.

Made public to allow access for CreateIndexConstantAction and FromBaseTable, but this is no longer necessary when the debug property to keep disposable statistics is removed.

timeOfCreation	back to summary
private final long timeOfCreation Specifies when the daemon was created.

traceToDerbyLog	back to summary
private final boolean traceToDerbyLog Tells if traces are written to the Derby log file.

traceToStdOut	back to summary
private final boolean traceToStdOut Tells if traces are written to standard out.

tsb	back to summary
private final StringBuffer tsb

wuProcessed	back to summary
private long wuProcessed

wuRejectedDup	back to summary
private long wuRejectedDup

wuRejectedFQ	back to summary
private long wuRejectedFQ

wuRejectedOther	back to summary
private long wuRejectedOther

wuScheduled	back to summary
private long wuScheduled

Constructor Detail

IndexStatisticsDaemonImpl	back to summary
public IndexStatisticsDaemonImpl(HeaderPrintWriter log, boolean doLog, String traceLevel, Database db, String userName, String databaseName) Creates a new daemon. Parameters log:HeaderPrintWriter the log to write to doLog:boolean whether to log activity information traceLevel:String whether, and to where, trace information should be written ("off\|log\|stdout\|both") db:Database the database ("off\|log\|stdout\|both") userName:String the name of the database owner databaseName:String the name of the database (not stored in the db obj)

IndexStatisticsDaemonImpl

back to summary

public IndexStatisticsDaemonImpl(HeaderPrintWriter log, boolean doLog, String traceLevel, Database db, String userName, String databaseName)

Creates a new daemon.

Parameters

log:HeaderPrintWriter: the log to write to
doLog:boolean: whether to log activity information
traceLevel:String: whether, and to where, trace information should be written ("off|log|stdout|both")
db:Database: the database ("off|log|stdout|both")
userName:String: the name of the database owner
databaseName:String: the name of the database (not stored in the db obj)

Method Detail

acceptWork back to summary

acceptWork	back to summary
private boolean acceptWork(TableDescriptor td) Determines if the given work can be accepted. Parameters td:TableDescriptor the table descriptor to check Returns:boolean `true` if work can be accepted, `false` if not.

private boolean acceptWork(TableDescriptor td)

Determines if the given work can be accepted.

Parameters

td:TableDescriptor: the table descriptor to check

Returns:boolean

true if work can be accepted, false if not.

appendRunStats	back to summary
private void appendRunStats(StringBuffer sb) Appends runtime statistics to the given string buffer. Parameters sb:StringBuffer the string buffer to append to

appendRunStats

back to summary

private void appendRunStats(StringBuffer sb)

Appends runtime statistics to the given string buffer.

Parameters

sb:StringBuffer: the string buffer to append to

cardToStr	back to summary
private static String cardToStr(long[] cardinality) Produces a textual representation of the cardinality numbers. Parameters cardinality:long[] index cardinality Returns:String A string.

cardToStr

back to summary

private static String cardToStr(long[] cardinality)

Produces a textual representation of the cardinality numbers.

Parameters

cardinality:long[]: index cardinality

Returns:String

A string.

dbAtLeast10_9	back to summary
private boolean dbAtLeast10_9(Database db) Tells if the database is 10.9 or newer.

extractIstatInfo	back to summary
private static String extractIstatInfo(Throwable t) Purely for debugging, to avoid printing too much info.

fmtScanTimes	back to summary
private static String fmtScanTimes(long[][] timings) Format array of scan durations as a string.

generateStatistics	back to summary
private void generateStatistics(LanguageConnectionContext lcc, TableDescriptor td) throws StandardException Generates index statistics for all indexes associated with the given table descriptor. This method is run as a background task. Parameters lcc:LanguageConnectionContext connection context to use to perform the work td:TableDescriptor target base table descriptor Exceptions StandardException: if accessing the conglomerates fail

generateStatistics

back to summary

private void generateStatistics(LanguageConnectionContext lcc, TableDescriptor td) throws StandardException

Generates index statistics for all indexes associated with the given table descriptor.

This method is run as a background task.

Parameters

lcc:LanguageConnectionContext: connection context to use to perform the work
td:TableDescriptor: target base table descriptor

Exceptions

StandardException:: if accessing the conglomerates fail

getContextService	back to summary
private static ContextService getContextService() Must be private so that user code can't call this entry point.

handleExpectedErrors back to summary

handleExpectedErrors	back to summary
private boolean handleExpectedErrors(TableDescriptor td, StandardException se) Handles expected errors. The logging of expected errors is for observability purposes only. The daemon is capable of dealing with these errors, and no interaction from the user is expected. Parameters se:StandardException the exception to handle Returns:boolean `true` if the error was handled, `false` otherwise

private boolean handleExpectedErrors(TableDescriptor td, StandardException se)

Handles expected errors.

The logging of expected errors is for observability purposes only. The daemon is capable of dealing with these errors, and no interaction from the user is expected.

Parameters

se:StandardException: the exception to handle

Returns:boolean

true if the error was handled, false otherwise

handleFatalErrors back to summary

handleFatalErrors	back to summary
private boolean handleFatalErrors(ContextManager cm, StandardException se) Handles fatal errors that will cause the daemon to be shut down. Parameters cm:ContextManager context manager se:StandardException the exception to handle Returns:boolean `true` if the error was handled, `false` otherwise

private boolean handleFatalErrors(ContextManager cm, StandardException se)

Handles fatal errors that will cause the daemon to be shut down.

Parameters

cm:ContextManager: context manager
se:StandardException: the exception to handle

Returns:boolean

true if the error was handled, false otherwise

handleUnexpectedErrors back to summary

handleUnexpectedErrors	back to summary
private boolean handleUnexpectedErrors(TableDescriptor td, StandardException se) Handles unexpected errors. Unexpected errors are error conditions the daemon isn't set up to handle specifically. For this reason the stack trace will be logged to allow for later investigation. In general it is expected that the daemon will be able to recover by dropping the current unit of work and move on to the next one (if any). Parameters se:StandardException the exception to handle Returns:boolean `true` if the error was handled, `false` otherwise

private boolean handleUnexpectedErrors(TableDescriptor td, StandardException se)

Handles unexpected errors.

Unexpected errors are error conditions the daemon isn't set up to handle specifically. For this reason the stack trace will be logged to allow for later investigation.

In general it is expected that the daemon will be able to recover by dropping the current unit of work and move on to the next one (if any).

Parameters

se:StandardException: the exception to handle

Returns:boolean

true if the error was handled, false otherwise

invalidateStatements	back to summary
private void invalidateStatements(LanguageConnectionContext lcc, TableDescriptor td, boolean asBackgroundTask) throws StandardException Performs an invalidation action for the given table (the event being statistics update). Parameters lcc:LanguageConnectionContext connection context to use to perform the work td:TableDescriptor the table to invalidate for asBackgroundTask:boolean whether the update is done automatically as part of a background task or if explicitly invoked by the user Exceptions StandardException: if the invalidation request fails

invalidateStatements

back to summary

private void invalidateStatements(LanguageConnectionContext lcc, TableDescriptor td, boolean asBackgroundTask) throws StandardException

Performs an invalidation action for the given table (the event being statistics update).

Parameters

lcc:LanguageConnectionContext: connection context to use to perform the work
td:TableDescriptor: the table to invalidate for
asBackgroundTask:boolean: whether the update is done automatically as part of a background task or if explicitly invoked by the user

Exceptions

StandardException:: if the invalidation request fails

isShuttingDown	back to summary
private boolean isShuttingDown() Return true if we are being shutdown

log	back to summary
private void log(boolean asBackgroundTask, TableDescriptor td, String msg) See Also `log(boolean, TableDescriptor, Throwable, String)`

log back to summary

log	back to summary
private void log(boolean asBackgroundTask, TableDescriptor td, Throwable t, String msg) Logs the information given. Note that if `asBackgroundTask` is false, nothing will be logged currently. Parameters asBackgroundTask:boolean `true` if logging for the background daemon automatically updating stats, `false` if not td:TableDescriptor current table descriptor being worked on, may be `null` t:Throwable raised error, may be `null` msg:String the message to log

private void log(boolean asBackgroundTask, TableDescriptor td, Throwable t, String msg)

Logs the information given.

Note that if asBackgroundTask is false, nothing will be logged currently.

Parameters

asBackgroundTask:boolean: true if logging for the background daemon automatically updating stats, false if not
td:TableDescriptor: current table descriptor being worked on, may be null
t:Throwable: raised error, may be null
msg:String: the message to log

logAlways back to summary

logAlways	back to summary
private void logAlways(TableDescriptor td, Throwable t, String msg) Logs the information given. Parameters td:TableDescriptor current table descriptor being worked on, may be `null` t:Throwable raised error, may be `null` msg:String the message to log

private void logAlways(TableDescriptor td, Throwable t, String msg)

Logs the information given.

Parameters

td:TableDescriptor: current table descriptor being worked on, may be null
t:Throwable: raised error, may be null
msg:String: the message to log

processingLoop	back to summary
private void processingLoop() Main processing loop which will compute statistics until the queue of scheduled work units has been drained.

run

back to summary

public void run()

Implements java.lang.Runnable.run.

Drives the statistics generation.

This method will be run in a separate thread, and it will keep working as long as there is work to do. When the queue is exhausted, the method will exit (the thread dies).

runExplicitly back to summary

public void runExplicitly(LanguageConnectionContext lcc, TableDescriptor td, ConglomerateDescriptor[] cds, String runContext) throws StandardException

Implements org.apache.derby.iapi.services.daemon.IndexStatisticsDaemon.runExplicitly.

Runs the statistics update sequence explicitly as requested by the user.

Parameters

lcc:LanguageConnectionContext: connection context to use to perform the work
td:TableDescriptor: the base table
cds:ConglomerateDescriptor[]: the indexes to update (non-index conglomerates are ignored)
runContext:String: the context in which the operation is run (i.e. 'ALTER TABLE', may be null)

Exceptions

StandardException:: if updating the index statistics fails

schedule

back to summary

public void schedule(TableDescriptor td)

Implements org.apache.derby.iapi.services.daemon.IndexStatisticsDaemon.schedule.

Schedules an update of the index statistics for the specified table.

Assume the descriptor will be valid until we get around to generate the statistics. If it turns out to be invalid, it will be discarded.

Parameters

td:TableDescriptor: base table descriptor to update index statistics for

setHeapRowEstimate

back to summary

private void setHeapRowEstimate(TransactionController tc, long tableId, long rowEstimate) throws StandardException

Sets the row estimate for the heap conglomerate.

Parameters

tc:TransactionController: transaction to use
tableId:long: the heap table
rowEstimate:long: estimate of number of rows in the table

Exceptions

StandardException:: if accessing the table fails

sleep back to summary

private static void sleep(long ms)

Puts the current thread to sleep for maximum ms milliseconds.

No guarantee is provided for the minimum amount of time slept. If interrupted, the interrupt flag will be set again.

Parameters

ms:long: target sleep time

stop

back to summary

public void stop()

Implements org.apache.derby.iapi.services.daemon.IndexStatisticsDaemon.stop.

Stops the daemon.

Will also clear the queue and print runtime statistics to the log the first time the method is invoked.

trace	back to summary
private synchronized void trace(int indentLevel, String msg)

updateIndexStatsMinion back to summary

private void updateIndexStatsMinion(LanguageConnectionContext lcc, TableDescriptor td, ConglomerateDescriptor[] cds, boolean asBackgroundTask) throws StandardException

Updates the index statistics for the given table and the specified indexes.

API note: Using null to update the statistics for all conglomerates is preferred over explicitly passing an array with all the conglomerates for the table. Doing so allows for some optimizations, and will cause a disposable statistics check to be performed.

Parameters

lcc:LanguageConnectionContext: language connection context used to perform the work
td:TableDescriptor: the table to update index stats for
cds:ConglomerateDescriptor[]: the conglomerates to update statistics for (non-index conglomerates will be ignored), null means all indexes
asBackgroundTask:boolean: whether the updates are done automatically as part of a background task or if explicitly invoked by the user

Exceptions

StandardException:: if something goes wrong

writeUpdatedStats

back to summary

private void writeUpdatedStats(LanguageConnectionContext lcc, TableDescriptor td, UUID index, long numRows, long[] cardinality, boolean asBackgroundTask) throws StandardException

Writes updated statistics for the specified index to the data dictionary.

Parameters

lcc:LanguageConnectionContext: connection context to use to perform the work
td:TableDescriptor: the base table
index:UUID: the index of the base table
numRows:long: number of rows in the base table
cardinality:long[]: the number of unique values in the index (per number of leading columns)
asBackgroundTask:boolean: whether the update is done automatically as part of a background task or if explicitly invoked by the user

Exceptions

StandardException:: if updating the data dictionary fails

org.apache.derby.impl.services.daemon back to summary

private Class IndexStatisticsDaemonImpl.KeyComparator

Class Inheritance

extends Object

java.lang.Object
org.apache.derby.impl.services.daemon.IndexStatisticsDaemonImpl.KeyComparator

Support class used to compare keys when scanning indexes.

Field Summary

Modifier and Type	Field and Description
private DataValueDescriptor[]	curr
private static final int	FETCH_SIZE Number of rows fetched per iteration.
private DataValueDescriptor[]	lastUniqueKey
private long	numRows
private DataValueDescriptor[]	prev
private final DataValueDescriptor[][]	rowBufferArray
private int	rowsReadLastRead

Constructor Summary

Access	Constructor and Description
public	KeyComparator(ExecIndexRow index row (template) ir) Creates a key comparator for the given index.

Method Summary

Modifier and Type	Method and Description
public int	Returns: `-1` if the current and previous key are identical, the index of the changed part of the key otherwise ([0, key length>) compareWithPrevKey(int row index index) Compares the key at the specified index with the previous key.
public int	Returns: Number of rows fetched. fetchRows(GroupFetchScanController the scan controller gsc) Fetches rows from the scan controller.
public long	Returns: Number of rows fetched. getRowCount() Returns the number of rows fetched.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

Field Detail

curr	back to summary
private DataValueDescriptor[] curr

FETCH_SIZE	back to summary
private static final int FETCH_SIZE Number of rows fetched per iteration.

lastUniqueKey	back to summary
private DataValueDescriptor[] lastUniqueKey

numRows	back to summary
private long numRows

prev	back to summary
private DataValueDescriptor[] prev

rowBufferArray	back to summary
private final DataValueDescriptor[][] rowBufferArray

rowsReadLastRead	back to summary
private int rowsReadLastRead

Constructor Detail

KeyComparator

back to summary

public KeyComparator(ExecIndexRow ir)

Creates a key comparator for the given index.

Parameters

ir:ExecIndexRow: index row (template)

Method Detail

compareWithPrevKey back to summary

public int compareWithPrevKey(int index) throws StandardException

Compares the key at the specified index with the previous key.

Parameters

index:int: row index

Returns:int

-1 if the current and previous key are identical, the index of the changed part of the key otherwise ([0, key length>)

Exceptions

StandardException:: if comparing the two keys fails

fetchRows

back to summary

public int fetchRows(GroupFetchScanController gsc) throws StandardException

Fetches rows from the scan controller.

Parameters

gsc:GroupFetchScanController: the scan controller

Returns:int

Number of rows fetched.

Exceptions

StandardException:: if fetching rows fails

getRowCount

back to summary

public long getRowCount()

Returns the number of rows fetched.

Returns:long: Number of rows fetched.

public Class IndexStatisticsDaemonImpl

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail

private Class IndexStatisticsDaemonImpl.KeyComparator

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail