OpenRegionHandler (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.executor.EventHandler
- - org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler

All Implemented Interfaces:

Comparable<Runnable>, Runnable

Direct Known Subclasses:

OpenMetaHandler
```
@InterfaceAudience.Private
public class OpenRegionHandler
extends EventHandler
```
Handles opening of a region on a region server.
This is executed after receiving an OPEN RPC from the master or client.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

(package private) static class OpenRegionHandler.PostOpenDeployTasksThread
Thread to run region post open tasks.
- Nested classes/interfaces inherited from class org.apache.hadoop.hbase.executor.EventHandler
  EventHandler.EventHandlerListener

Nested Classes
Modifier and Type	Class and Description
`(package private) static class`	`OpenRegionHandler.PostOpenDeployTasksThread` Thread to run region post open tasks.

Field Summary

Fields
Modifier and Type	Field and Description
`private OpenRegionCoordination`	`coordination`
`private HTableDescriptor`	`htd`
`private static org.apache.commons.logging.Log`	`LOG`
`private long`	`masterSystemTime`
`private OpenRegionCoordination.OpenRegionDetails`	`ord`
`private HRegionInfo`	`regionInfo`
`protected RegionServerServices`	`rsServices`
`private boolean`	`useZKForAssignment`

Fields inherited from class org.apache.hadoop.hbase.executor.EventHandler
eventType, seqids, server, waitingTimeForEvents

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`OpenRegionHandler(Server server, RegionServerServices rsServices, HRegionInfo regionInfo, HTableDescriptor htd, EventType eventType, long masterSystemTime, OpenRegionCoordination coordination, OpenRegionCoordination.OpenRegionDetails ord)`
	`OpenRegionHandler(Server server, RegionServerServices rsServices, HRegionInfo regionInfo, HTableDescriptor htd, long masterSystemTime, OpenRegionCoordination coordination, OpenRegionCoordination.OpenRegionDetails ord)`

Method Summary

Methods
Modifier and Type	Method and Description
`(package private) void`	`cleanupFailedOpen(HRegion region)`
`private void`	`doCleanUpOnFailedOpen(HRegion region, boolean transitionedToOpening, OpenRegionCoordination.OpenRegionDetails ord)`
`HRegionInfo`	`getRegionInfo()`
`private boolean`	`isRegionStillOpening()`
`private static boolean`	`isRegionStillOpening(HRegionInfo regionInfo, RegionServerServices rsServices)`
`(package private) HRegion`	`openRegion()`
`void`	`process()` This method is the main processing loop to be implemented by the various subclasses.
`(package private) boolean`	`updateMeta(HRegion r, long masterSystemTime)` Update ZK or META.

Methods inherited from class org.apache.hadoop.hbase.executor.EventHandler
compareTo, getEventType, getInformativeName, getListener, getPriority, getSeqid, handleException, prepare, run, setListener, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LOG

private static final org.apache.commons.logging.Log LOG

rsServices

protected final RegionServerServices rsServices

regionInfo
```
private final HRegionInfo regionInfo
```

htd
```
private final HTableDescriptor htd
```

masterSystemTime
```
private final long masterSystemTime
```

coordination

private OpenRegionCoordination coordination

ord

private OpenRegionCoordination.OpenRegionDetails ord

useZKForAssignment

private final boolean useZKForAssignment

Constructor Detail

OpenRegionHandler

public OpenRegionHandler(Server server,
                 RegionServerServices rsServices,
                 HRegionInfo regionInfo,
                 HTableDescriptor htd,
                 long masterSystemTime,
                 OpenRegionCoordination coordination,
                 OpenRegionCoordination.OpenRegionDetails ord)

OpenRegionHandler

protected OpenRegionHandler(Server server,
                 RegionServerServices rsServices,
                 HRegionInfo regionInfo,
                 HTableDescriptor htd,
                 EventType eventType,
                 long masterSystemTime,
                 OpenRegionCoordination coordination,
                 OpenRegionCoordination.OpenRegionDetails ord)

Method Detail

getRegionInfo
```
public HRegionInfo getRegionInfo()
```

process
```
public void process()
             throws IOException
```
Description copied from class: EventHandler

This method is the main processing loop to be implemented by the various subclasses.

Specified by:

process in class EventHandler

Throws:

IOException

doCleanUpOnFailedOpen

private void doCleanUpOnFailedOpen(HRegion region,
                         boolean transitionedToOpening,
                         OpenRegionCoordination.OpenRegionDetails ord)
                            throws IOException

Throws:: IOException

updateMeta
```
boolean updateMeta(HRegion r,
                 long masterSystemTime)
```
Update ZK or META. This can take a while if for example the hbase:meta is not available -- if server hosting hbase:meta crashed and we are waiting on it to come back -- so run in a thread and keep updating znode state meantime so master doesn't timeout our region-in-transition. Caller must cleanup region if this fails.

openRegion
```
HRegion openRegion()
```
Returns:
Instance of HRegion if successful open else null.

cleanupFailedOpen

void cleanupFailedOpen(HRegion region)
                 throws IOException

Throws:: IOException

isRegionStillOpening

private static boolean isRegionStillOpening(HRegionInfo regionInfo,
                           RegionServerServices rsServices)

isRegionStillOpening

private boolean isRegionStillOpening()

Class OpenRegionHandler

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.executor.EventHandler

Field Summary

Fields inherited from class org.apache.hadoop.hbase.executor.EventHandler

Constructor Summary

Method Summary

Methods inherited from class org.apache.hadoop.hbase.executor.EventHandler

Methods inherited from class java.lang.Object

Field Detail

LOG

rsServices

regionInfo

htd

masterSystemTime

coordination

ord

useZKForAssignment

Constructor Detail

OpenRegionHandler

OpenRegionHandler

Method Detail

getRegionInfo

process

doCleanUpOnFailedOpen

updateMeta

openRegion

cleanupFailedOpen

isRegionStillOpening

isRegionStillOpening