Package org.apache.hadoop.hdfs.server.federation.store.impl

Class MountTableStoreImpl

java.lang.Object

org.apache.hadoop.hdfs.server.federation.store.RecordStore<R>

org.apache.hadoop.hdfs.server.federation.store.CachedRecordStore<MountTable>

org.apache.hadoop.hdfs.server.federation.store.MountTableStore

org.apache.hadoop.hdfs.server.federation.store.impl.MountTableStoreImpl

All Implemented Interfaces:

MountTableManager, StateStoreCache

@Private
@Evolving
public class MountTableStoreImpl
extends MountTableStore

Implementation of the MountTableStore state store API.

Constructor Summary

Constructors

Constructor	Description
MountTableStoreImpl(StateStoreDriver driver)

Method Summary

Modifier and Type	Method	Description
AddMountTableEntriesResponse	addMountTableEntries(AddMountTableEntriesRequest request)	Add multiple entries to the mount table.
AddMountTableEntryResponse	addMountTableEntry(AddMountTableEntryRequest request)	When add mount table entry, it needs WRITE permission of the nearest parent entry if exist, and EXECUTE permission of other ancestor entries.
GetDestinationResponse	getDestination(GetDestinationRequest request)	Get the destination subcluster (namespace) of a file/directory.
GetMountTableEntriesResponse	getMountTableEntries(GetMountTableEntriesRequest request)	List all mount table entries present at or below the path.
RefreshMountTableEntriesResponse	refreshMountTableEntries(RefreshMountTableEntriesRequest request)	Refresh mount table entries cache from the state store.
RemoveMountTableEntryResponse	removeMountTableEntry(RemoveMountTableEntryRequest request)	Remove an entry from the mount table.
UpdateMountTableEntryResponse	updateMountTableEntry(UpdateMountTableEntryRequest request)	Updates an existing entry in the mount table.

Methods inherited from class org.apache.hadoop.hdfs.server.federation.store.MountTableStore

getQuotaManager, setQuotaManager, setRefreshService, updateCacheAllRouters

Methods inherited from class org.apache.hadoop.hdfs.server.federation.store.CachedRecordStore

getCachedRecords, getCachedRecordsAndTimeStamp, loadCache, overrideExpiredRecord, overrideExpiredRecords

Methods inherited from class org.apache.hadoop.hdfs.server.federation.store.RecordStore

getDriver, getRecordClass, newInstance

Methods inherited from class java.lang.Object

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

Constructor Detail

MountTableStoreImpl

public MountTableStoreImpl(StateStoreDriver driver)

Method Detail

addMountTableEntry

public AddMountTableEntryResponse addMountTableEntry(AddMountTableEntryRequest request)
                                              throws java.io.IOException

When add mount table entry, it needs WRITE permission of the nearest parent entry if exist, and EXECUTE permission of other ancestor entries.

Parameters:

request - add mount table entry request

Returns:

add mount table entry response

Throws:

java.io.IOException - if mount table cannot be accessed

addMountTableEntries

public AddMountTableEntriesResponse addMountTableEntries(AddMountTableEntriesRequest request)
                                                  throws java.io.IOException

Description copied from interface: MountTableManager

Add multiple entries to the mount table.

Parameters:

request - Request object with fully populated list of mount point entries.

Returns:

True if all the mount table entries were successfully committed to the data store.

Throws:

java.io.IOException - Throws exception if the data store is not initialized.

updateMountTableEntry

public UpdateMountTableEntryResponse updateMountTableEntry(UpdateMountTableEntryRequest request)
                                                    throws java.io.IOException

Description copied from interface: MountTableManager

Updates an existing entry in the mount table.

Parameters:

request - Fully populated request object.

Returns:

True if the mount table entry was successfully committed to the data store.

Throws:

java.io.IOException - Throws exception if the data store is not initialized.

removeMountTableEntry

public RemoveMountTableEntryResponse removeMountTableEntry(RemoveMountTableEntryRequest request)
                                                    throws java.io.IOException

Description copied from interface: MountTableManager

Remove an entry from the mount table.

Parameters:

request - Fully populated request object.

Returns:

True the mount table entry was removed from the data store.

Throws:

java.io.IOException - Throws exception if the data store is not initialized.

getMountTableEntries

public GetMountTableEntriesResponse getMountTableEntries(GetMountTableEntriesRequest request)
                                                  throws java.io.IOException

Description copied from interface: MountTableManager

List all mount table entries present at or below the path. Fetches from the state store.

Parameters:

request - Fully populated request object.

Returns:

List of all mount table entries under the path. Zero-length list if none are found.

Throws:

java.io.IOException - Throws exception if the data store cannot be queried.

refreshMountTableEntries

public RefreshMountTableEntriesResponse refreshMountTableEntries(RefreshMountTableEntriesRequest request)
                                                          throws java.io.IOException

Description copied from interface: MountTableManager

Refresh mount table entries cache from the state store. Cache is updated periodically but with this API cache can be refreshed immediately. This API is primarily meant to be called from the Admin Server. Admin Server will call this API and refresh mount table cache of all the routers while changing mount table entries.

Parameters:

request - Fully populated request object.

Returns:

True the mount table entry was updated without any error.

Throws:

java.io.IOException - Throws exception if the data store is not initialized.

getDestination

public GetDestinationResponse getDestination(GetDestinationRequest request)
                                      throws java.io.IOException

Description copied from interface: MountTableManager

Get the destination subcluster (namespace) of a file/directory.

Parameters:

request - Fully populated request object including the file to check.

Returns:

The response including the subcluster where the input file is.

Throws:

java.io.IOException - Throws exception if the data store is not initialized.