Description:

Write FlowFile data to Hadoop Distributed File System (HDFS)

Tags:

hadoop, HDFS, put, copy, filesystem

Properties:

In the list below, the names of required properties appear in bold. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the NiFi Expression Language.

NameDefault ValueAllowable ValuesDescription
Hadoop Configuration ResourcesA 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.
Kerberos PrincipalKerberos principal to authenticate as. Requires nifi.kerberos.krb5.file to be set in your nifi.properties
Kerberos KeytabKerberos keytab associated with the principal. Requires nifi.kerberos.krb5.file to be set in your nifi.properties
Kerberos Relogin Period4 hoursPeriod of time which should pass before attempting a kerberos relogin
DirectoryThe parent HDFS directory to which files should be written
Supports Expression Language: true
Conflict Resolution Strategyfail
  • replace
  • ignore
  • fail
Indicates what should happen when a file with the same name already exists in the output directory
Block SizeSize of each block as written to HDFS. This overrides the Hadoop Configuration
IO Buffer SizeAmount of memory to use to buffer file contents during IO. This overrides the Hadoop Configuration
ReplicationNumber of times that HDFS will replicate each file. This overrides the Hadoop Configuration
Permissions umaskA umask represented as an octal number which determines the permissions of files written to HDFS. This overrides the Hadoop Configuration dfs.umaskmode
Remote OwnerChanges the owner of the HDFS file to this value after it is written. This only works if NiFi is running as a user that has HDFS super user privilege to change owner
Remote GroupChanges the group of the HDFS file to this value after it is written. This only works if NiFi is running as a user that has HDFS super user privilege to change group
Compression codecNONE
  • NONE
  • DEFAULT
  • BZIP
  • GZIP
  • LZ4
  • SNAPPY
  • AUTOMATIC
No Description Provided.

Relationships:

NameDescription
failureFiles that could not be written to HDFS for some reason are transferred to this relationship
successFiles that have been successfully written to HDFS are transferred to this relationship

Reads Attributes:

None specified.

Writes Attributes:

NameDescription
filenameThe name of the file written to HDFS comes from the value of this attribute.

See Also:

GetHDFS