org.apache.hadoop.hbase.util

Class HBaseFsckRepair

java.lang.Object

org.apache.hadoop.hbase.util.HBaseFsckRepair

@InterfaceAudience.Private
public class HBaseFsckRepair
extends Object

This class contains helper methods that repair parts of hbase's filesystem contents.

Field Summary

Fields

Modifier and Type	Field and Description
private static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
HBaseFsckRepair()

Method Summary

Modifier and Type	Method and Description
static void	closeRegionSilentlyAndWait(Connection connection, ServerName server, RegionInfo region) Contacts a region server and waits up to hbase.hbck.close.timeout ms (default 120s) to close the region.
static HRegion	createHDFSRegionDir(org.apache.hadoop.conf.Configuration conf, RegionInfo hri, TableDescriptor htd) Creates, flushes, and closes a new region.
static void	fixMetaHoleOnlineAndAddReplicas(org.apache.hadoop.conf.Configuration conf, RegionInfo hri, Collection<ServerName> servers, int numReplicas) Puts the specified RegionInfo into META with replica related columns
static void	fixMultiAssignment(Connection connection, RegionInfo region, List<ServerName> servers) Fix multiple assignment by doing silent closes on each RS hosting the region and then force ZK unassigned node to OFFLINE to trigger assignment by master.
static void	fixUnassigned(Admin admin, RegionInfo region) Fix unassigned by creating/transition the unassigned ZK node for this region to OFFLINE state with a special flag to tell the master that this is a forced operation by HBCK.
private static void	forceOfflineInZK(Admin admin, RegionInfo region) In 0.90, this forces an HRI offline by setting the RegionTransitionData in ZK to have HBCK_CODE_NAME as the server.
static void	removeParentInMeta(org.apache.hadoop.conf.Configuration conf, RegionInfo hri)
static void	waitUntilAssigned(Admin admin, RegionInfo region)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final org.slf4j.Logger LOG

Constructor Detail

HBaseFsckRepair

public HBaseFsckRepair()

Method Detail

fixMultiAssignment

public static void fixMultiAssignment(Connection connection,
                                      RegionInfo region,
                                      List<ServerName> servers)
                               throws IOException,
                                      org.apache.zookeeper.KeeperException,
                                      InterruptedException

Fix multiple assignment by doing silent closes on each RS hosting the region and then force ZK unassigned node to OFFLINE to trigger assignment by master.

Parameters:

connection - HBase connection to the cluster

region - Region to undeploy

servers - list of Servers to undeploy from

Throws:

IOException

org.apache.zookeeper.KeeperException

InterruptedException

fixUnassigned

public static void fixUnassigned(Admin admin,
                                 RegionInfo region)
                          throws IOException,
                                 org.apache.zookeeper.KeeperException,
                                 InterruptedException

Fix unassigned by creating/transition the unassigned ZK node for this region to OFFLINE state with a special flag to tell the master that this is a forced operation by HBCK. This assumes that info is in META. nnnn

Throws:

IOException

org.apache.zookeeper.KeeperException

InterruptedException

forceOfflineInZK

private static void forceOfflineInZK(Admin admin,
                                     RegionInfo region)
                              throws ZooKeeperConnectionException,
                                     org.apache.zookeeper.KeeperException,
                                     IOException,
                                     InterruptedException

In 0.90, this forces an HRI offline by setting the RegionTransitionData in ZK to have HBCK_CODE_NAME as the server. This is a special case in the AssignmentManager that attempts an assign call by the master. This doesn't seem to work properly in the updated version of 0.92+'s hbck so we use assign to force the region into transition. This has the side-effect of requiring a RegionInfo that considers regionId (timestamp) in comparators that is addressed by HBASE-5563.

Throws:

ZooKeeperConnectionException

org.apache.zookeeper.KeeperException

IOException

InterruptedException

waitUntilAssigned

public static void waitUntilAssigned(Admin admin,
                                     RegionInfo region)
                              throws IOException,
                                     InterruptedException

Throws:

IOException

InterruptedException

closeRegionSilentlyAndWait

public static void closeRegionSilentlyAndWait(Connection connection,
                                              ServerName server,
                                              RegionInfo region)
                                       throws IOException,
                                              InterruptedException

Contacts a region server and waits up to hbase.hbck.close.timeout ms (default 120s) to close the region. This bypasses the active hmaster.

Throws:

IOException

InterruptedException

fixMetaHoleOnlineAndAddReplicas

public static void fixMetaHoleOnlineAndAddReplicas(org.apache.hadoop.conf.Configuration conf,
                                                   RegionInfo hri,
                                                   Collection<ServerName> servers,
                                                   int numReplicas)
                                            throws IOException

Puts the specified RegionInfo into META with replica related columns

Throws:

IOException

createHDFSRegionDir

public static HRegion createHDFSRegionDir(org.apache.hadoop.conf.Configuration conf,
                                          RegionInfo hri,
                                          TableDescriptor htd)
                                   throws IOException

Creates, flushes, and closes a new region.

Throws:

IOException

removeParentInMeta

public static void removeParentInMeta(org.apache.hadoop.conf.Configuration conf,
                                      RegionInfo hri)
                               throws IOException

Throws:

IOException