com.sleepycat.je.recovery
Class RecoveryManager

java.lang.Object
  com.sleepycat.je.recovery.RecoveryManager

public class RecoveryManager
extends Object

Constructor Summary

RecoveryManager(EnvironmentImpl env)
Make a recovery manager

Method Summary

RecoveryInfo	recover(boolean readOnly) Look for an existing log and use it to create an in memory structure for accessing existing databases.
static void	traceRootDeletion(Level level, DatabaseImpl database) Log trace information about root deletions, called by INCompressor and recovery.
static void	undo(Level traceLevel, DatabaseImpl db, TreeLocation location, LN lnFromLog, byte[] mainKey, byte[] dupKey, long logLsn, long abortLsn, boolean abortKnownDeleted, RecoveryInfo info, boolean splitsAllowed) Undo the changes to this node.

Methods inherited from class java.lang.Object

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

Constructor Detail

RecoveryManager

public RecoveryManager(EnvironmentImpl env)
                throws DatabaseException

Make a recovery manager

Throws:

DatabaseException

Method Detail

recover

public RecoveryInfo recover(boolean readOnly)
                     throws DatabaseException

Look for an existing log and use it to create an in memory structure for accessing existing databases. The file manager and logging system are only available after recovery.

Returns:

RecoveryInfo statistics about the recovery process.

Throws:

DatabaseException

undo

public static void undo(Level traceLevel,
                        DatabaseImpl db,
                        TreeLocation location,
                        LN lnFromLog,
                        byte[] mainKey,
                        byte[] dupKey,
                        long logLsn,
                        long abortLsn,
                        boolean abortKnownDeleted,
                        RecoveryInfo info,
                        boolean splitsAllowed)
                 throws DatabaseException

Undo the changes to this node. Here are the rules that govern the action taken.

 found LN in  | abortLsn is | logLsn ==       | action taken
    tree      | null        | LSN in tree     | by undo
 -------------+-------------+----------------------------------------
      Y       |     N       |      Y          | replace w/abort LSN
 ------------ +-------------+-----------------+-----------------------
      Y       |     Y       |      Y          | remove from tree
 ------------ +-------------+-----------------+-----------------------
      Y       |     N/A     |      N          | no action
 ------------ +-------------+-----------------+-----------------------
      N       |     N/A     |    N/A          | no action (*)
 (*) If this key is not present in the tree, this record doesn't
 reflect the IN state of the tree and this log entry is not applicable.

 

Parameters:

location - holds state about the search in the tree. Passed in from the recovery manager to reduce objection creation overhead.

lnFromLog - - the new node to put in the tree.

mainKey - is the key that navigates us through the main tree

dupTreeKey - is the key that navigates us through the duplicate tree

logLsn - is the LSN from the just-read log entry

abortLsn - gives us the location of the original version of the node

info - is a recovery stats object.

Throws:

DatabaseException

traceRootDeletion

public static void traceRootDeletion(Level level,
                                     DatabaseImpl database)

Log trace information about root deletions, called by INCompressor and recovery.