@Test
public void reserveTest() throws Exception {
// Reserve on top tier
long blockId = 100;
BlockStoreLocation tier0 = BlockStoreLocation.anyDirInTier(StorageLevelAlias.MEM.getValue());
for (int i = 0; i < 3; i++) {
TieredBlockStoreTestUtils.cache(SESSION_ID, blockId++, BLOCK_SIZE, mBlockStore, tier0);
}
CommonUtils.sleepMs(
WorkerContext.getConf().getLong(Constants.WORKER_SPACE_RESERVER_INTERVAL_MS));
BlockStoreMeta storeMeta = mBlockStore.getBlockStoreMeta();
Assert.assertEquals(3 * BLOCK_SIZE, storeMeta.getUsedBytes());
List<Long> usedBytesOnTiers = storeMeta.getUsedBytesOnTiers();
Assert.assertEquals(
2 * BLOCK_SIZE, (long) usedBytesOnTiers.get(StorageLevelAlias.MEM.getValue() - 1));
Assert.assertEquals(
BLOCK_SIZE, (long) usedBytesOnTiers.get(StorageLevelAlias.HDD.getValue() - 1));
// Reserve on under tier
for (int i = 0; i < 7; i++) {
TieredBlockStoreTestUtils.cache(SESSION_ID, blockId++, BLOCK_SIZE, mBlockStore, tier0);
}
CommonUtils.sleepMs(
WorkerContext.getConf().getLong(Constants.WORKER_SPACE_RESERVER_INTERVAL_MS));
storeMeta = mBlockStore.getBlockStoreMeta();
Assert.assertEquals(9 * BLOCK_SIZE, storeMeta.getUsedBytes());
usedBytesOnTiers = storeMeta.getUsedBytesOnTiers();
Assert.assertEquals(
2 * BLOCK_SIZE, (long) usedBytesOnTiers.get(StorageLevelAlias.MEM.getValue() - 1));
Assert.assertEquals(
7 * BLOCK_SIZE, (long) usedBytesOnTiers.get(StorageLevelAlias.HDD.getValue() - 1));
}
/**
* Gets the StorageDir given its location in the store.
*
* @param location Location of the dir
* @return the StorageDir object
* @throws IllegalArgumentException if location is not a specific dir or the location is invalid
*/
public synchronized StorageDir getDir(BlockStoreLocation location) {
if (location.equals(BlockStoreLocation.anyTier())
|| location.equals(BlockStoreLocation.anyDirInTier(location.tierAlias()))) {
throw new IllegalArgumentException(
"Failed to get block path: " + location + " is not a specific dir.");
}
return getTier(location.tierAlias()).getDir(location.dir());
}
/**
* Moves the metadata of an existing block to another location or throws IOExceptions.
*
* @param blockMeta the meta data of the block to move
* @param newLocation new location of the block
* @return the new block metadata if success, absent otherwise
* @throws IllegalArgumentException when the newLocation is not in the tiered storage
* @throws NotFoundException when the block to move is not found
* @throws AlreadyExistsException when the block to move already exists in the destination
* @throws OutOfSpaceException when destination have no extra space to hold the block to move
*/
public synchronized BlockMeta moveBlockMeta(BlockMeta blockMeta, BlockStoreLocation newLocation)
throws NotFoundException, AlreadyExistsException, OutOfSpaceException {
// If existing location belongs to the target location, simply return the current block meta.
BlockStoreLocation oldLocation = blockMeta.getBlockLocation();
if (oldLocation.belongTo(newLocation)) {
LOG.info("moveBlockMeta: moving {} to {} is a noop", oldLocation, newLocation);
return blockMeta;
}
long blockSize = blockMeta.getBlockSize();
int newTierAlias = newLocation.tierAlias();
StorageTier newTier = getTier(newTierAlias);
StorageDir newDir = null;
if (newLocation.equals(BlockStoreLocation.anyDirInTier(newTierAlias))) {
for (StorageDir dir : newTier.getStorageDirs()) {
if (dir.getAvailableBytes() >= blockSize) {
newDir = dir;
break;
}
}
} else {
StorageDir dir = newTier.getDir(newLocation.dir());
if (dir.getAvailableBytes() >= blockSize) {
newDir = dir;
}
}
if (newDir == null) {
throw new OutOfSpaceException(
"Failed to move BlockMeta: newLocation "
+ newLocation
+ " does not have enough space for "
+ blockSize
+ " bytes");
}
StorageDir oldDir = blockMeta.getParentDir();
oldDir.removeBlockMeta(blockMeta);
BlockMeta newBlockMeta = new BlockMeta(blockMeta.getBlockId(), blockSize, newDir);
newDir.addBlockMeta(newBlockMeta);
return newBlockMeta;
}
/**
* Gets the amount of available space of given location in bytes. Master queries the total number
* of bytes available on each tier of the worker, and Evictor/Allocator often cares about the
* bytes at a {@link StorageDir}.
*
* @param location location the check available bytes
* @return available bytes
* @throws IllegalArgumentException when location does not belong to tiered storage
*/
public synchronized long getAvailableBytes(BlockStoreLocation location) {
long spaceAvailable = 0;
if (location.equals(BlockStoreLocation.anyTier())) {
for (StorageTier tier : mTiers) {
spaceAvailable += tier.getAvailableBytes();
}
return spaceAvailable;
}
int tierAlias = location.tierAlias();
StorageTier tier = getTier(tierAlias);
// TODO: This should probably be max of the capacity bytes in the dirs?
if (location.equals(BlockStoreLocation.anyDirInTier(tierAlias))) {
return tier.getAvailableBytes();
}
int dirIndex = location.dir();
StorageDir dir = tier.getDir(dirIndex);
return dir.getAvailableBytes();
}
/**
* Moves a block from its current location to a target location, currently only tier level moves
* are supported
*
* @param sessionId The id of the client
* @param blockId The id of the block to move
* @param tierAlias The alias of the tier to move the block to
* @throws IllegalArgumentException if tierAlias is out of range of tiered storage
* @throws BlockDoesNotExistException if blockId cannot be found
* @throws BlockAlreadyExistsException if blockId already exists in committed blocks of the
* newLocation
* @throws InvalidWorkerStateException if blockId has not been committed
* @throws WorkerOutOfSpaceException if newLocation does not have enough extra space to hold the
* block
* @throws IOException if block cannot be moved from current location to newLocation
*/
public void moveBlock(long sessionId, long blockId, String tierAlias)
throws BlockDoesNotExistException, BlockAlreadyExistsException, InvalidWorkerStateException,
WorkerOutOfSpaceException, IOException {
BlockStoreLocation dst = BlockStoreLocation.anyDirInTier(tierAlias);
mBlockStore.moveBlock(sessionId, blockId, dst);
}
/**
* Frees space to make a specific amount of bytes available in the tier.
*
* @param sessionId the session ID
* @param availableBytes the amount of free space in bytes
* @param tierAlias the alias of the tier to free space
* @throws WorkerOutOfSpaceException if there is not enough space
* @throws BlockDoesNotExistException if blocks can not be found
* @throws IOException if blocks fail to be moved or deleted on file system
* @throws BlockAlreadyExistsException if blocks to move already exists in destination location
* @throws InvalidWorkerStateException if blocks to move/evict is uncommitted
*/
public void freeSpace(long sessionId, long availableBytes, String tierAlias)
throws WorkerOutOfSpaceException, BlockDoesNotExistException, IOException,
BlockAlreadyExistsException, InvalidWorkerStateException {
BlockStoreLocation location = BlockStoreLocation.anyDirInTier(tierAlias);
mBlockStore.freeSpace(sessionId, availableBytes, location);
}
/**
* Creates a block. This method is only called from a data server.
*
* <p>Call {@link #getTempBlockWriterRemote(long, long)} to get a writer for writing to the block.
*
* @param sessionId The id of the client
* @param blockId The id of the block to be created
* @param tierAlias The alias of the tier to place the new block in
* @param initialBytes The initial amount of bytes to be allocated
* @throws IllegalArgumentException if location does not belong to tiered storage
* @throws BlockAlreadyExistsException if blockId already exists, either temporary or committed,
* or block in eviction plan already exists
* @throws WorkerOutOfSpaceException if this Store has no more space than the initialBlockSize
* @throws IOException if blocks in eviction plan fail to be moved or deleted
*/
public void createBlockRemote(long sessionId, long blockId, String tierAlias, long initialBytes)
throws BlockAlreadyExistsException, WorkerOutOfSpaceException, IOException {
BlockStoreLocation loc = BlockStoreLocation.anyDirInTier(tierAlias);
TempBlockMeta createdBlock = mBlockStore.createBlockMeta(sessionId, blockId, loc, initialBytes);
FileUtils.createBlockPath(createdBlock.getPath());
}
