com.google.cloud.hadoop.fs.gcs

Class GoogleHadoopFileSystem

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.fs.FileSystem

com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase

com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystem

All Implemented Interfaces:

FileSystemDescriptor, Closeable, AutoCloseable, org.apache.hadoop.conf.Configurable

public class GoogleHadoopFileSystem
extends GoogleHadoopFileSystemBase

GoogleHadoopFileSystem is a version of GoogleHadoopFileSystemBase which is rooted in a single bucket at initialization time; in this case, Hadoop paths no longer correspond directly to general GCS paths, and all Hadoop operations going through this FileSystem will never touch any GCS bucket other than the bucket on which this FileSystem is rooted.

This implementation sacrifices a small amount of cross-bucket interoperability in favor of more straightforward FileSystem semantics and compatibility with existing Hadoop applications. In particular, it is not subject to bucket-naming constraints, and files are allowed to be placed in root.

Nested Class Summary

Nested classes/interfaces inherited from class com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase

GoogleHadoopFileSystemBase.Counter, GoogleHadoopFileSystemBase.ListStatusFileNotFoundBehavior, GoogleHadoopFileSystemBase.ParentTimestampUpdateIncludePredicate

Nested classes/interfaces inherited from class org.apache.hadoop.fs.FileSystem

org.apache.hadoop.fs.FileSystem.Statistics

Field Summary

Fields inherited from class com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase

AUTHENTICATION_PREFIX, BLOCK_SIZE_DEFAULT, BLOCK_SIZE_KEY, BUFFERSIZE_DEFAULT, BUFFERSIZE_KEY, counters, DEFAULT_FILTER, defaultBlockSize, ENABLE_GCE_SERVICE_ACCOUNT_AUTH_KEY, GCS_CLIENT_ID_KEY, GCS_CLIENT_SECRET_KEY, GCS_CREATE_SYSTEM_BUCKET_DEFAULT, GCS_CREATE_SYSTEM_BUCKET_KEY, GCS_ENABLE_FLAT_GLOB_DEFAULT, GCS_ENABLE_FLAT_GLOB_KEY, GCS_ENABLE_MARKER_FILE_CREATION_DEFAULT, GCS_ENABLE_MARKER_FILE_CREATION_KEY, GCS_ENABLE_METADATA_CACHE_DEFAULT, GCS_ENABLE_METADATA_CACHE_KEY, GCS_ENABLE_REPAIR_IMPLICIT_DIRECTORIES_DEFAULT, GCS_ENABLE_REPAIR_IMPLICIT_DIRECTORIES_KEY, GCS_FILE_SIZE_LIMIT_250GB, GCS_FILE_SIZE_LIMIT_250GB_DEFAULT, GCS_METADATA_CACHE_DIRECTORY_DEFAULT, GCS_METADATA_CACHE_DIRECTORY_KEY, GCS_METADATA_CACHE_TYPE_DEFAULT, GCS_METADATA_CACHE_TYPE_KEY, GCS_PARENT_TIMESTAMP_UPDATE_ENABLE_DEFAULT, GCS_PARENT_TIMESTAMP_UPDATE_ENABLE_KEY, GCS_PARENT_TIMESTAMP_UPDATE_EXCLUDES_DEFAULT, GCS_PARENT_TIMESTAMP_UPDATE_EXCLUDES_KEY, GCS_PARENT_TIMESTAMP_UPDATE_INCLUDES_DEFAULT, GCS_PARENT_TIMESTAMP_UPDATE_INCLUDES_KEY, GCS_PROJECT_ID_KEY, GCS_SYSTEM_BUCKET_KEY, GCS_WORKING_DIRECTORY_KEY, gcsfs, GHFS_ID, initUri, listStatusFileNotFoundBehavior, log, MR_JOB_HISTORY_DONE_DIR_KEY, MR_JOB_HISTORY_INTERMEDIATE_DONE_DIR_KEY, PROPERTIES_FILE, REPLICATION_FACTOR_DEFAULT, SERVICE_ACCOUNT_AUTH_EMAIL_KEY, SERVICE_ACCOUNT_AUTH_KEYFILE_KEY, systemBucket, UNKNOWN_VERSION, VERSION, VERSION_PROPERTY, WRITE_BUFFERSIZE_DEFAULT, WRITE_BUFFERSIZE_KEY

Fields inherited from class org.apache.hadoop.fs.FileSystem

DEFAULT_FS, FS_DEFAULT_NAME_KEY, LOG, SHUTDOWN_HOOK_PRIORITY, statistics

Constructor Summary

Constructors

Constructor and Description
GoogleHadoopFileSystem() Constructs an instance of GoogleHadoopFileSystem; the internal GoogleCloudStorageFileSystem will be set up with config settings when initialize() is called.
GoogleHadoopFileSystem(GoogleCloudStorageFileSystem gcsfs) Constructs an instance of GoogleHadoopFileSystem using the provided GoogleCloudStorageFileSystem; initialize() will not re-initialize it.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	checkPath(org.apache.hadoop.fs.Path path)
void	configureBuckets(String systemBucketName, boolean createConfiguredBuckets) Validates and possibly creates the system bucket.
org.apache.hadoop.fs.Path	getDefaultWorkingDirectory() Gets the default value of working directory.
org.apache.hadoop.fs.Path	getFileSystemRoot() Returns the Hadoop path representing the root of the FileSystem associated with this FileSystemDescriptor.
URI	getGcsPath(org.apache.hadoop.fs.Path hadoopPath) Translates a "gs:/" style hadoopPath (or relative path which is not fully-qualified) into the appropriate GCS path which is compatible with the underlying GcsFs or gsutil.
org.apache.hadoop.fs.Path	getHadoopPath(URI gcsPath) Validates GCS Path belongs to this file system.
protected String	getHomeDirectorySubpath() Override to allow a homedir subpath which sits directly on our FileSystem root.
String	getScheme() As the global-rooted FileSystem, our hadoop-path "scheme" is exactly equal to the general GCS scheme.

Methods inherited from class com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase

append, close, completeLocalOutput, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, create, createCounterMap, delete, delete, deleteOnExit, getCanonicalServiceName, getContentSummary, getDefaultBlockSize, getDefaultPort, getDefaultReplication, getDelegationToken, getFileChecksum, getFileStatus, getHadoopScheme, getHomeDirectory, getUri, getUsed, getWorkingDirectory, globStatus, globStatus, initialize, initialize, listStatus, makeQualified, mkdirs, open, processDeleteOnExit, rename, setListStatusFileNotFoundBehavior, setOwner, setPermission, setTimes, setVerifyChecksum, setWorkingDirectory, startLocalOutput

Methods inherited from class org.apache.hadoop.fs.FileSystem

addDelegationTokens, append, append, areSymlinksEnabled, cancelDeleteOnExit, canonicalizeUri, clearStatistics, closeAll, closeAllForUGI, concat, copyFromLocalFile, copyFromLocalFile, copyToLocalFile, copyToLocalFile, create, create, create, create, create, create, create, create, create, create, create, create, createNewFile, createNonRecursive, createNonRecursive, createNonRecursive, createSnapshot, createSnapshot, createSymlink, deleteSnapshot, enableSymlinks, exists, fixRelativePart, get, get, get, getAclStatus, getAllStatistics, getBlockSize, getCanonicalUri, getChildFileSystems, getDefaultBlockSize, getDefaultReplication, getDefaultUri, getFileBlockLocations, getFileBlockLocations, getFileLinkStatus, getFileSystemClass, getFSofPath, getInitialWorkingDirectory, getLength, getLinkTarget, getLocal, getName, getNamed, getReplication, getServerDefaults, getServerDefaults, getStatistics, getStatistics, getStatus, getStatus, isDirectory, isFile, listCorruptFileBlocks, listFiles, listLocatedStatus, listLocatedStatus, listStatus, listStatus, listStatus, mkdirs, mkdirs, modifyAclEntries, moveFromLocalFile, moveFromLocalFile, moveToLocalFile, newInstance, newInstance, newInstance, newInstanceLocal, open, primitiveCreate, primitiveMkdir, primitiveMkdir, printStatistics, removeAcl, removeAclEntries, removeDefaultAcl, rename, renameSnapshot, resolveLink, resolvePath, setAcl, setDefaultUri, setDefaultUri, setReplication, setWriteChecksum, supportsSymlinks

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Constructor Detail

GoogleHadoopFileSystem

public GoogleHadoopFileSystem()

Constructs an instance of GoogleHadoopFileSystem; the internal GoogleCloudStorageFileSystem will be set up with config settings when initialize() is called.

GoogleHadoopFileSystem

public GoogleHadoopFileSystem(GoogleCloudStorageFileSystem gcsfs)

Constructs an instance of GoogleHadoopFileSystem using the provided GoogleCloudStorageFileSystem; initialize() will not re-initialize it.

Method Detail

configureBuckets

public void configureBuckets(String systemBucketName,
                    boolean createConfiguredBuckets)
                      throws IOException

Validates and possibly creates the system bucket. Should be overridden to configure other buckets. Sets and validates the root bucket.

Overrides:

configureBuckets in class GoogleHadoopFileSystemBase

Parameters:

systemBucketName - Name of system bucket

createConfiguredBuckets - Whether or not to create systemBucketName if it does not exist.

Throws:

IOException - if systemBucketName is invalid or cannot be found. and createSystemBucket is false.

checkPath

protected void checkPath(org.apache.hadoop.fs.Path path)

Overrides:

checkPath in class GoogleHadoopFileSystemBase

getHomeDirectorySubpath

protected String getHomeDirectorySubpath()

Override to allow a homedir subpath which sits directly on our FileSystem root.

Specified by:

getHomeDirectorySubpath in class GoogleHadoopFileSystemBase

getHadoopPath

public org.apache.hadoop.fs.Path getHadoopPath(URI gcsPath)

Validates GCS Path belongs to this file system. The bucket must match the root bucket provided at initialization time.

Specified by:

getHadoopPath in class GoogleHadoopFileSystemBase

Parameters:

gcsPath - Fully-qualified GCS path, of the form gs:///