Package org.apache.accumulo.server.manager.recovery

Class NoOpLogCloser

java.lang.Object

org.apache.accumulo.server.manager.recovery.NoOpLogCloser

All Implemented Interfaces:

LogCloser

public class NoOpLogCloser
extends Object
implements LogCloser

HadoopLogCloser recovers leases in DistributedFileSystem implementations and does nothing in local FileSystem implementations. For other implementations HadoopLogCloser throws an exception. However, Accumulo could be used with other Hadoop compatible FileSystem implementations that do not support lease recovery and we should not throw an exception in this case. This LogCloser implementation supports that case. WARNING: USE AT YOUR OWN RISK! When using this class as the LogCloser, it's possible that WALog recovery will not work if the file system implementation needs some type of recovery to occur for files that were being written to, but not properly closed. To use this class, set the Property Property.MANAGER_WAL_CLOSER_IMPLEMENTATION to the full name of this class.

Constructor Summary

Constructors

Constructor	Description
NoOpLogCloser()

Method Summary

Modifier and Type	Method	Description
long	close(AccumuloConfiguration conf, org.apache.hadoop.conf.Configuration hadoopConf, VolumeManager fs, org.apache.hadoop.fs.Path path)	Attempts to properly close a WALog

Methods inherited from class java.lang.Object

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

Constructor Details

NoOpLogCloser

public NoOpLogCloser()

Method Details

close

public long close(AccumuloConfiguration conf,
 org.apache.hadoop.conf.Configuration hadoopConf,
 VolumeManager fs,
 org.apache.hadoop.fs.Path path)
           throws IOException

Description copied from interface: LogCloser

Attempts to properly close a WALog

Specified by:

close in interface LogCloser

Parameters:

conf - AccumuloConfiguration

hadoopConf - Hadoop configuration

fs - VolumeManager

path - WALog file path

Returns:

amount of time to wait before retrying, 0 if succeeded

Throws:

IOException - exception closing walog