// Tests that files are evicted when there is not enough space in the worker.
@Test
public void evictionTest() throws Exception {
final int blockSize = (int) WORKER_CAPACITY_BYTES / 2;
AlluxioURI file1 = new AlluxioURI("/file1");
FileSystemTestUtils.createByteFile(mFileSystem, file1, WriteType.MUST_CACHE, blockSize);
// File should be in memory after it is written with MUST_CACHE
URIStatus fileInfo1 = mFileSystem.getStatus(file1);
Assert.assertEquals(100, fileInfo1.getInMemoryPercentage());
AlluxioURI file2 = new AlluxioURI("/file2");
FileSystemTestUtils.createByteFile(mFileSystem, file2, WriteType.MUST_CACHE, blockSize);
// Both file 1 and 2 should be in memory since the combined size is not larger than worker space
fileInfo1 = mFileSystem.getStatus(file1);
URIStatus fileInfo2 = mFileSystem.getStatus(file2);
Assert.assertEquals(100, fileInfo1.getInMemoryPercentage());
Assert.assertEquals(100, fileInfo2.getInMemoryPercentage());
AlluxioURI file3 = new AlluxioURI("/file3");
FileSystemTestUtils.createByteFile(mFileSystem, file3, WriteType.MUST_CACHE, blockSize);
waitForHeartbeat();
fileInfo1 = mFileSystem.getStatus(file1);
fileInfo2 = mFileSystem.getStatus(file2);
URIStatus fileInfo3 = mFileSystem.getStatus(file3);
// File 3 should be in memory and one of file 1 or 2 should be in memory
Assert.assertEquals(100, fileInfo3.getInMemoryPercentage());
Assert.assertTrue(
"Exactly one of file1 and file2 should be 100% in memory",
fileInfo1.getInMemoryPercentage() == 100 ^ fileInfo2.getInMemoryPercentage() == 100);
}
/**
* Constructs a new stream for reading a file from HDFS.
*
* @param uri the Alluxio file URI
* @param conf Hadoop configuration
* @param bufferSize the buffer size
* @param stats filesystem statistics
* @throws IOException if the underlying file does not exist or its stream cannot be created
*/
public HdfsFileInputStream(
AlluxioURI uri,
org.apache.hadoop.conf.Configuration conf,
int bufferSize,
org.apache.hadoop.fs.FileSystem.Statistics stats)
throws IOException {
LOG.debug("HdfsFileInputStream({}, {}, {}, {}, {})", uri, conf, bufferSize, stats);
long bufferBytes = Configuration.getBytes(Constants.USER_FILE_BUFFER_BYTES);
mBuffer = new byte[Ints.checkedCast(bufferBytes) * 4];
mCurrentPosition = 0;
FileSystem fs = FileSystem.Factory.get();
mHadoopConf = conf;
mHadoopBufferSize = bufferSize;
mStatistics = stats;
try {
mFileInfo = fs.getStatus(uri);
mHdfsPath = new Path(mFileInfo.getUfsPath());
mAlluxioFileInputStream = fs.openFile(uri, OpenFileOptions.defaults());
} catch (FileDoesNotExistException e) {
throw new FileNotFoundException(
ExceptionMessage.HDFS_FILE_NOT_FOUND.getMessage(mHdfsPath, uri));
} catch (AlluxioException e) {
throw new IOException(e);
}
}
// Tests that caching a block successfully persists the block if the block exists
@Test
public void cacheBlockTest() throws Exception {
mFileSystem.createFile(new AlluxioURI("/testFile"));
URIStatus file = mFileSystem.getStatus(new AlluxioURI("/testFile"));
final int blockSize = (int) WORKER_CAPACITY_BYTES / 10;
// Construct the block ids for the file.
final long blockId0 = BlockId.createBlockId(BlockId.getContainerId(file.getFileId()), 0);
final long blockId1 = BlockId.createBlockId(BlockId.getContainerId(file.getFileId()), 1);
String filename =
mBlockWorkerServiceHandler.requestBlockLocation(SESSION_ID, blockId0, blockSize);
createBlockFile(filename, blockSize);
mBlockWorkerServiceHandler.cacheBlock(SESSION_ID, blockId0);
// The master should be immediately updated with the persisted block
Assert.assertEquals(blockSize, mBlockMasterClient.getUsedBytes());
// Attempting to cache a non existent block should throw an exception
Exception exception = null;
try {
mBlockWorkerServiceHandler.cacheBlock(SESSION_ID, blockId1);
} catch (TException e) {
exception = e;
}
Assert.assertNotNull(exception);
}
private List<FileBlockInfo> getFileBlocks(AlluxioURI path) throws IOException {
try {
return mFileSystem.getStatus(path).getFileBlockInfos();
} catch (AlluxioException e) {
throw new IOException(e);
}
}
// Tests that lock block returns the correct path
@Test
public void lockBlockTest() throws Exception {
final int blockSize = (int) WORKER_CAPACITY_BYTES / 2;
CreateFileOptions options =
CreateFileOptions.defaults()
.setBlockSizeBytes(blockSize)
.setWriteType(WriteType.MUST_CACHE);
FileOutStream out = mFileSystem.createFile(new AlluxioURI("/testFile"), options);
URIStatus file = mFileSystem.getStatus(new AlluxioURI("/testFile"));
final long blockId = BlockId.createBlockId(BlockId.getContainerId(file.getFileId()), 0);
out.write(BufferUtils.getIncreasingByteArray(blockSize));
out.close();
String localPath = mBlockWorkerServiceHandler.lockBlock(blockId, SESSION_ID).getBlockPath();
// The local path should exist
Assert.assertNotNull(localPath);
UnderFileSystem ufs = UnderFileSystem.get(localPath, mMasterConfiguration);
byte[] data = new byte[blockSize];
int bytesRead = ufs.open(localPath).read(data);
// The data in the local file should equal the data we wrote earlier
Assert.assertEquals(blockSize, bytesRead);
Assert.assertTrue(BufferUtils.equalIncreasingByteArray(bytesRead, data));
mBlockWorkerServiceHandler.unlockBlock(blockId, SESSION_ID);
}
/**
* Convenience method which ensures the given path exists, wrapping any {@link AlluxioException}
* in {@link IOException}.
*
* @param path the path to look up
* @throws IOException if an Alluxio exception occurs
*/
private void ensureExists(AlluxioURI path) throws IOException {
try {
mFileSystem.getStatus(path);
} catch (AlluxioException e) {
throw new IOException(e);
}
}
@Override
public boolean rename(Path src, Path dst) throws IOException {
LOG.info("rename({}, {})", src, dst);
if (mStatistics != null) {
mStatistics.incrementWriteOps(1);
}
AlluxioURI srcPath = new AlluxioURI(HadoopUtils.getPathWithoutScheme(src));
AlluxioURI dstPath = new AlluxioURI(HadoopUtils.getPathWithoutScheme(dst));
ensureExists(srcPath);
URIStatus dstStatus;
try {
dstStatus = mFileSystem.getStatus(dstPath);
} catch (IOException | AlluxioException e) {
dstStatus = null;
}
// If the destination is an existing folder, try to move the src into the folder
if (dstStatus != null && dstStatus.isFolder()) {
dstPath = dstPath.join(srcPath.getName());
}
try {
mFileSystem.rename(srcPath, dstPath);
return true;
} catch (IOException | AlluxioException e) {
LOG.error("Failed to rename {} to {}", src, dst, e);
return false;
}
}
/**
* {@inheritDoc}
*
* <p>If the file does not exist in Alluxio, query it from HDFS.
*/
@Override
public FileStatus getFileStatus(Path path) throws IOException {
LOG.info("getFileStatus({})", path);
if (mStatistics != null) {
mStatistics.incrementReadOps(1);
}
AlluxioURI uri = new AlluxioURI(HadoopUtils.getPathWithoutScheme(path));
URIStatus fileStatus;
try {
fileStatus = mFileSystem.getStatus(uri);
} catch (FileDoesNotExistException e) {
throw new FileNotFoundException(e.getMessage());
} catch (AlluxioException e) {
throw new IOException(e);
}
return new FileStatus(
fileStatus.getLength(),
fileStatus.isFolder(),
BLOCK_REPLICATION_CONSTANT,
fileStatus.getBlockSizeBytes(),
fileStatus.getLastModificationTimeMs(),
fileStatus.getCreationTimeMs(),
new FsPermission((short) fileStatus.getMode()),
fileStatus.getOwner(),
fileStatus.getGroup(),
new Path(mAlluxioHeader + uri));
}
/**
* Attempts to create a file. Overwrite will not succeed if the path exists and is a folder.
*
* @param path path to create
* @param permission permissions of the created file/folder
* @param overwrite overwrite if file exists
* @param bufferSize the size in bytes of the buffer to be used
* @param replication under filesystem replication factor
* @param blockSize block size in bytes
* @param progress queryable progress
* @return an {@link FSDataOutputStream} created at the indicated path of a file
* @throws IOException if overwrite is not specified and the path already exists or if the path is
* a folder
*/
@Override
public FSDataOutputStream create(
Path path,
FsPermission permission,
boolean overwrite,
int bufferSize,
short replication,
long blockSize,
Progressable progress)
throws IOException {
LOG.info(
"create({}, {}, {}, {}, {}, {}, {})",
path,
permission,
overwrite,
bufferSize,
replication,
blockSize,
progress);
if (mStatistics != null) {
mStatistics.incrementWriteOps(1);
}
// Check whether the file already exists, and delete it if overwrite is true
AlluxioURI uri = new AlluxioURI(HadoopUtils.getPathWithoutScheme(path));
try {
if (mFileSystem.exists(uri)) {
if (!overwrite) {
throw new IOException(ExceptionMessage.FILE_ALREADY_EXISTS.getMessage(uri));
}
if (mFileSystem.getStatus(uri).isFolder()) {
throw new IOException(ExceptionMessage.FILE_CREATE_IS_DIRECTORY.getMessage(uri));
}
mFileSystem.delete(uri);
}
} catch (AlluxioException e) {
throw new IOException(e);
}
// The file no longer exists at this point, so we can create it
CreateFileOptions options =
CreateFileOptions.defaults()
.setBlockSizeBytes(blockSize)
.setMode(new Mode(permission.toShort()));
try {
FileOutStream outStream = mFileSystem.createFile(uri, options);
return new FSDataOutputStream(outStream, mStatistics);
} catch (AlluxioException e) {
throw new IOException(e);
}
}
// Tests that lock block returns error on failure
@Test
public void lockBlockFailureTest() throws Exception {
mFileSystem.createFile(new AlluxioURI("/testFile"));
URIStatus file = mFileSystem.getStatus(new AlluxioURI("/testFile"));
final long blockId = BlockId.createBlockId(BlockId.getContainerId(file.getFileId()), 0);
Exception exception = null;
try {
mBlockWorkerServiceHandler.lockBlock(blockId, SESSION_ID);
} catch (AlluxioTException e) {
exception = e;
}
// A file does not exist exception should have been thrown
Assert.assertNotNull(exception);
}
// Tests that cancelling a block will remove the temporary file
@Test
public void cancelBlockTest() throws Exception {
mFileSystem.createFile(new AlluxioURI("/testFile"));
URIStatus file = mFileSystem.getStatus(new AlluxioURI("/testFile"));
final int blockSize = (int) WORKER_CAPACITY_BYTES / 2;
final long blockId = BlockId.createBlockId(BlockId.getContainerId(file.getFileId()), 0);
String filename =
mBlockWorkerServiceHandler.requestBlockLocation(SESSION_ID, blockId, blockSize);
createBlockFile(filename, blockSize);
mBlockWorkerServiceHandler.cancelBlock(SESSION_ID, blockId);
// The block should not exist after being cancelled
Assert.assertFalse(new File(filename).exists());
// The master should not have recorded any used space after the block is cancelled
waitForHeartbeat();
Assert.assertEquals(0, mBlockMasterClient.getUsedBytes());
}
