Hadoop FileSystem interface implemented by DseFileSystem

DseFileSystem has partial support of the Hadoop FileSystem interface.

The DseFileSystem class has partial support of the Hadoop FileSystem interface.

Specify the DSEFS URI by using the following form: dsefs://host0[:port][,host1[:port]]/. Multiple contact points can be specified in the URI, separated by commas. For example: dsefs://host1.example.com,host2.example.com/. If host1.example.com is down, a connection to host2.example.com will be attempted.

The following table outlines which methods have been implemented.

Table 1. Methods of Hadoop FileSystem interface implemented by DseFileSystem
Method	Status	Comment
`getScheme()`	✓	since 5.0.12, 5.1.6
`getURI()`	✓
`getName()`	✓	default, deprecated
`getDefaultPort()`	✓	since 5.0.12, 5.1.6
`makeQualified(Path)`	✓	default
`getDelegationToken(String)`	☓	returns null
`addDelegationTokens(String, Credentials)`	☓
`collectDelegationTokens(...)`	☓
`getChildFileSystems()`	✓	default, returns null
`getFileBlockLocations(FileStatus, long, long)`	✓
`getFileBlockLocations(Path, long, long)`	✓
`getServerDefaults()`	✓	default, deprecated
`getServerDefaults(Path)`	✓	default
`resolvePath(Path)`	✓	default
`open`	✓	all variants, buffer size not supported
`create`	✓	all variants, checksum options, progress reporting and `APPEND`, `NEW_BLOCK` flags not supported
`createNonRecursive`	☓	all variants
`createNewFile`	✓	default
`append`	✓	all variants, progress reporting not supported
`concat`	✓	since 5.0.12, 5.1.6
`getReplication(Path)`	✓
`setReplication(Path, short)`	☓	does nothing
`rename`	✓
`truncate(Path, long)`	✓	since 5.0.12, 5.1.6
`delete(Path)`	✓
`delete(Path, boolean)`	✓
`deleteOnExit(Path)`	✓	default
`cancelDeleteOnExit(Path)`	✓	default
`exists(Path)`	✓
`isDirectory(Path)`	✓
`isFile(Path)`	✓
`getLength(Path)`	✓
`getContentSummary(Path)`	✓	default
`listStatus`	✓	all variants
`listCorruptFileBlocks(Path)`	☓	throws `UnsupportedOperationException`
`globStatus`	✓	default
`listLocatedStatus`	✓	default
`listStatusIterator`	✓	default
`listFiles`	✓	default
`getHomeDirectory()`	✓	default
`getWorkingDirectory()`	✓
`setWorkingDirectory()`	✓
`getInitialWorkingDirectory()`	⚠	default,returns null
`mkdirs`	✓
`copyFromLocalFile`	✓	default
`moveFromLocalFile`	✓	default
`copyToLocalFile`	✓	default
`moveToLocalFile`	✓	default
`startLocalOutput`	✓	default
`close`	✓
`getUsed`	✓	default, slow
`getBlockSize`	✓
`getDefaultBlockSize()`	✓	since 5.0.12, 5.1.6
`getDefaultBlockSize(Path)`	✓	since 5.0.12, 5.1.6
`getDefaultReplication()`	✓	since 5.0.12, 5.1.6
`getDefaultReplication(Path)`	✓	since 5.0.12, 5.1.6
`getFileStatus(Path)`	✓
`access(Path, FsAction)`	✓	default
`createSymLink`	☓	throws `UnsupportedOperationException`
`getFileLinkStatus`	⚠	default, same as `getFileStatus`
`supportsSymLinks`	✓	returns false
`getLinkTarget`	☓	throws `UnsupportedOperationException`
`resolveLink`	☓	throws `UnsupportedOperationException`
`getFileChecksum`	☓	returns null
`setVerifyChecksum`	☓	does nothing
`setWriteChecksum`	☓	does nothing
`getStatus`	☓	default, returns incorrect default data
`setPermission`	✓
`setOwner`	✓
`setTimes`	☓	does nothing
`createSnapshot`	☓	throws `UnsupportedOperationException`
`renameSnapshot`	☓	throws `UnsupportedOperationException`
`deleteSnapshot`	☓	throws `UnsupportedOperationException`
`modifyAclEntries`	☓	throws `UnsupportedOperationException`
`removeAclEntries`	☓	throws `UnsupportedOperationException`
`removeDefaultAcl`	☓	throws `UnsupportedOperationException`
`removeAcl`	☓	throws `UnsupportedOperationException`
`setAcl`	☓	throws `UnsupportedOperationException`
`getAclStatus`	☓	throws `UnsupportedOperationException`
`setXAttr`	☓	throws `UnsupportedOperationException`
`getXAttr`	☓	throws `UnsupportedOperationException`
`getXAttrs`	☓	throws `UnsupportedOperationException`
`listXAttrs`	☓	throws `UnsupportedOperationException`
`removeXAttr`	☓	throws `UnsupportedOperationException`