Package org.apache.bookkeeper.bookie.storage.directentrylogger

Class LogMetadata

java.lang.Object

org.apache.bookkeeper.bookie.storage.directentrylogger.LogMetadata

class LogMetadata
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final long	INVALID_LID
(package private) static final long	LEDGERS_MAP_ENTRY_ID
(package private) static final int	LEDGERS_MAP_ENTRY_SIZE
(package private) static final int	LEDGERS_MAP_HEADER_SIZE	Ledgers map is composed of multiple parts that can be split into separated entries.
(package private) static final int	LEDGERS_MAP_MAX_BATCH_SIZE
(package private) static final int	LEDGERS_MAP_MAX_MAP_SIZE

Constructor Summary

Constructors

Constructor	Description
LogMetadata()

Method Summary

Modifier and Type	Method	Description
(package private) static EntryLogMetadata	read(LogReader reader)
(package private) static void	write(LogWriter writer, EntryLogMetadata metadata, io.netty.buffer.ByteBufAllocator allocator)

Methods inherited from class java.lang.Object

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

Field Details

LEDGERS_MAP_HEADER_SIZE

static final int LEDGERS_MAP_HEADER_SIZE

Ledgers map is composed of multiple parts that can be split into separated entries. Each of them is composed of:

 length: (4 bytes) [0-3]
 ledger id (-1): (8 bytes) [4 - 11]
 entry id: (8 bytes) [12-19]
 num ledgers stored in current metadata entry: (4 bytes) [20 - 23]
 ledger entries: sequence of (ledgerid, size) (8 + 8 bytes each) [24..]
 

See Also:

• Constant Field Values

LEDGERS_MAP_ENTRY_SIZE

static final int LEDGERS_MAP_ENTRY_SIZE

See Also:

• Constant Field Values

LEDGERS_MAP_MAX_BATCH_SIZE

static final int LEDGERS_MAP_MAX_BATCH_SIZE

See Also:

• Constant Field Values

LEDGERS_MAP_MAX_MAP_SIZE

static final int LEDGERS_MAP_MAX_MAP_SIZE

See Also:

• Constant Field Values

INVALID_LID

static final long INVALID_LID

See Also:

• Constant Field Values

LEDGERS_MAP_ENTRY_ID

static final long LEDGERS_MAP_ENTRY_ID

See Also:

• Constant Field Values

Constructor Details

LogMetadata

LogMetadata()

Method Details

write

static void write(LogWriter writer,
 EntryLogMetadata metadata,
 io.netty.buffer.ByteBufAllocator allocator)
           throws IOException

Throws:

IOException

read

static EntryLogMetadata read(LogReader reader)
                      throws IOException

Throws:

IOException