org.apache.hadoop.hbase.regionserver.wal

Interface WALActionsListener

All Known Implementing Classes:

Replication

@InterfaceAudience.Private
public interface WALActionsListener

Get notification of FSHLog/WAL log events. The invocations are inline so make sure your implementation is fast else you'll slow hbase.

Method Summary

Methods

Modifier and Type	Method and Description
void	logCloseRequested() The WAL is about to close.
void	logRollRequested() A request was made that the WAL be rolled.
void	postLogArchive(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL has been archived.
void	postLogRoll(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL has been rolled.
void	preLogArchive(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL is going to be archived.
void	preLogRoll(org.apache.hadoop.fs.Path oldPath, org.apache.hadoop.fs.Path newPath) The WAL is going to be rolled.
void	visitLogEntryBeforeWrite(HRegionInfo info, HLogKey logKey, WALEdit logEdit) Called before each write.
void	visitLogEntryBeforeWrite(HTableDescriptor htd, HLogKey logKey, WALEdit logEdit)

Method Detail

preLogRoll

void preLogRoll(org.apache.hadoop.fs.Path oldPath,
              org.apache.hadoop.fs.Path newPath)
                throws IOException

The WAL is going to be rolled. The oldPath can be null if this is the first log file from the regionserver.

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

postLogRoll

void postLogRoll(org.apache.hadoop.fs.Path oldPath,
               org.apache.hadoop.fs.Path newPath)
                 throws IOException

The WAL has been rolled. The oldPath can be null if this is the first log file from the regionserver.

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

preLogArchive

void preLogArchive(org.apache.hadoop.fs.Path oldPath,
                 org.apache.hadoop.fs.Path newPath)
                   throws IOException

The WAL is going to be archived.

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

postLogArchive

void postLogArchive(org.apache.hadoop.fs.Path oldPath,
                  org.apache.hadoop.fs.Path newPath)
                    throws IOException

The WAL has been archived.

Parameters:

oldPath - the path to the old hlog

newPath - the path to the new hlog

Throws:

IOException

logRollRequested

void logRollRequested()

A request was made that the WAL be rolled.

logCloseRequested

void logCloseRequested()

The WAL is about to close.

visitLogEntryBeforeWrite

void visitLogEntryBeforeWrite(HRegionInfo info,
                            HLogKey logKey,
                            WALEdit logEdit)

Called before each write.

Parameters:

info -

logKey -

logEdit -

visitLogEntryBeforeWrite

void visitLogEntryBeforeWrite(HTableDescriptor htd,
                            HLogKey logKey,
                            WALEdit logEdit)

Parameters:

htd -

logKey -

logEdit -