Retrieves a listing of files from HDFS. Each time a listing is performed, the files with the latest timestamp will be excluded and picked up during the next execution of the processor. This is done to ensure that we do not miss any files, or produce duplicates, in the cases where files with the same timestamp are written immediately before and after a single execution of the processor. For each file that is listed in HDFS, this processor creates a FlowFile that represents the HDFS file to be fetched in conjunction with FetchHDFS. This Processor is designed to run on Primary Node only in a cluster. If the primary node changes, the new Primary Node will pick up where the previous node left off without duplicating all of the data. Unlike GetHDFS, this Processor does not delete any data from HDFS.
| Name | Default Value | Allowable Values | Description |
|---|
| Hadoop Configuration Resources | | | A file or comma separated list of files which contains the Hadoop file system configuration. Without this, Hadoop will search the classpath for a 'core-site.xml' and 'hdfs-site.xml' file or will revert to a default configuration. To use swebhdfs, see 'Additional Details' section of PutHDFS's documentation.
This property expects a comma-separated list of file resources.
Supports Expression Language: true (will be evaluated using variable registry only) |
| Kerberos Credentials Service | | Controller Service API:
KerberosCredentialsService
Implementation: KeytabCredentialsService | Specifies the Kerberos Credentials Controller Service that should be used for authenticating with Kerberos |
| Kerberos User Service | | Controller Service API:
KerberosUserService
Implementations: KerberosPasswordUserService
KerberosTicketCacheUserService
KerberosKeytabUserService | Specifies the Kerberos User Controller Service that should be used for authenticating with Kerberos |
| Kerberos Principal | | | Kerberos principal to authenticate as. Requires nifi.kerberos.krb5.file to be set in your nifi.properties
Supports Expression Language: true (will be evaluated using variable registry only) |
| Kerberos Keytab | | | Kerberos keytab associated with the principal. Requires nifi.kerberos.krb5.file to be set in your nifi.properties
This property requires exactly one file to be provided..
Supports Expression Language: true (will be evaluated using variable registry only) |
| Kerberos Password | | | Kerberos password associated with the principal.
Sensitive Property: true |
| Kerberos Relogin Period | 4 hours | | Period of time which should pass before attempting a kerberos relogin.
This property has been deprecated, and has no effect on processing. Relogins now occur automatically.
Supports Expression Language: true (will be evaluated using variable registry only) |
| Additional Classpath Resources | | | A comma-separated list of paths to files and/or directories that will be added to the classpath and used for loading native libraries. When specifying a directory, all files with in the directory will be added to the classpath, but further sub-directories will not be included.
This property expects a comma-separated list of resources. Each of the resources may be of any of the following types: file, directory.
|
| Distributed Cache Service | | Controller Service API:
DistributedMapCacheClient
Implementations: HBase_2_ClientMapCacheService
CassandraDistributedMapCache
HBase_1_1_2_ClientMapCacheService
DistributedMapCacheClientService
CouchbaseMapCacheClient
HazelcastMapCacheClient
RedisDistributedMapCacheClientService | This property is ignored. State will be stored in the LOCAL or CLUSTER scope by the State Manager based on NiFi's configuration. |
| Directory | | | The HDFS directory from which files should be read
Supports Expression Language: true (will be evaluated using variable registry only) |
| Recurse Subdirectories | true | | Indicates whether to list files from subdirectories of the HDFS directory |
| Record Writer | | Controller Service API:
RecordSetWriterFactory
Implementations: AvroRecordSetWriter
ScriptedRecordSetWriter
JsonRecordSetWriter
ParquetRecordSetWriter
RecordSetWriterLookup
FreeFormTextRecordSetWriter
XMLRecordSetWriter
CSVRecordSetWriter | Specifies the Record Writer to use for creating the listing. If not specified, one FlowFile will be created for each entity that is listed. If the Record Writer is specified, all entities will be written to a single FlowFile. |
| File Filter | [^\.].* | | Only files whose names match the given regular expression will be picked up |
| File Filter Mode | filter-mode-directories-and-files | - Directories and Files
 - Files Only
- Full Path
| Determines how the regular expression in File Filter will be used when retrieving listings. |
| Minimum File Age | | | The minimum age that a file must be in order to be pulled; any file younger than this amount of time (based on last modification date) will be ignored |
| Maximum File Age | | | The maximum age that a file must be in order to be pulled; any file older than this amount of time (based on last modification date) will be ignored. Minimum value is 100ms. |
| Name | Description |
|---|
| filename | The name of the file that was read from HDFS. |
| path | The path is set to the absolute path of the file's directory on HDFS. For example, if the Directory property is set to /tmp, then files picked up from /tmp will have the path attribute set to "./". If the Recurse Subdirectories property is set to true and a file is picked up from /tmp/abc/1/2/3, then the path attribute will be set to "/tmp/abc/1/2/3". |
| hdfs.owner | The user that owns the file in HDFS |
| hdfs.group | The group that owns the file in HDFS |
| hdfs.lastModified | The timestamp of when the file in HDFS was last modified, as milliseconds since midnight Jan 1, 1970 UTC |
| hdfs.length | The number of bytes in the file in HDFS |
| hdfs.replication | The number of HDFS replicas for hte file |
| hdfs.permissions | The permissions for the file in HDFS. This is formatted as 3 characters for the owner, 3 for the group, and 3 for other users. For example rw-rw-r-- |