How to open a RCF file: The best way to open an RCF file is to simply double-click it and let the default assoisated application open the file. If you are unable to open the file this way, it may be because you do not have the correct application associated with the extension to view or edit the RCF file. Software that will open, convert or fix RCF files. These apps are known to open certain types of RCF files. Since many different programs may use RCF files for different purposes, you may need to try a few of the apps to open your specific RCF file.
Many people share .rcf files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .rcf file can be edited, converted or printed with. On this page, we try to provide assistance for handling .rcf files.
1 filename extension(s) found in our database.
.rcf - SonicWALL VPN Configuration
The RCF configuration files are related to SonicWALL Global VPN Client. RCF file is a SonicWALL VPN Configuration. The SonicWALL VPN Gateway administrator can distribute the default.rcf file with the Global VPN Client software to automatically create preconfigured VPN connections for streamlined deployment.
- Application:
- SonicWALL Global VPN Client
- Category:
- Configuration files
- Mime-type:
- application/octet-stream
- Magic:
- - / -
- Aliases:
- -
- SonicWALL VPN Configuration related extensions:
- .xgi
- XBCD Custom Settings File
- .ipk
- iPack Configuration File
- .qyp
- Quantec Yardstick Presets
- .x4k
- XML4King Configuration
- .cnf
- Origin Configuration File
- .omc
- Origin Custom Menu Configuration
Naturally, other applications may also use the .rcf file extension. Even harmful programs can create .rcf files. Be especially cautious with .rcf files coming from an unknown source!
Can't open a .rcf file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Windows can't open this file:
example.rcf
To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.
To avoid this error, you need to set the file association correctly.
- Open Control Panel > Control Panel Home > Default Programs > Set Associations.
- Select a file type in the list and click Change Program.
The .rcf file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
cf, crf, dcf, ecf, fcf, gcf, rc, rcb, rcc, rcd, rce, rcg, rcr, rct, rcv
Is it possible that the filename extension is misspelled?
Similar file extensions in our database:
- .rf
- RealFlash Clip
- .rdf
- ProWorx NXT Cross-reference Data
- .rdf
- SmartWare Report Definition File
- .rdf
- Resource Description Framework
- .ecf
- Efficient Calendar v2 Document
- .dcf
- Safetica Free Encrypted Archive
Operating systems
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Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android
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RCFile (Record Columnar File) is a data placement structure that determines how to store relational tables on computer clusters. It is designed for systems using the MapReduce framework. The RCFile structure includes a data storage format, data compression approach, and optimization techniques for data reading. It is able to meet all the four requirements of data placement: (1) fast data loading, (2) fast query processing, (3) highly efficient storage space utilization, and (4) a strong adaptivity to dynamic data access patterns.
RCFile is the result of research and collaborative efforts from Facebook, The Ohio State University, and the Institute of Computing Technology at the Chinese Academy of Sciences.
Summary[edit]
Data storage format[edit]
Open Rcf File
For example, a table in a database consists of 4 columns (c1 to c4):
| c1 | c2 | c3 | c4 |
|---|---|---|---|
| 11 | 12 | 13 | 14 |
| 21 | 22 | 23 | 24 |
| 31 | 32 | 33 | 34 |
| 41 | 42 | 43 | 44 |
| 51 | 52 | 53 | 54 |
To serialize the table, RCFile partitions this table first horizontally and then vertically, instead of only partitioning the table horizontally like the row-oriented DBMS (row-store). The horizontal partitioning will first partition the table into multiple row groups based on the row-group size, which is a user-specified value determining the size of each row group. For example, the table mentioned above can be partitioned to two row groups if the user specifies three rows as the size of each row group.
| c1 | c2 | c3 | c4 |
|---|---|---|---|
| 11 | 12 | 13 | 14 |
| 21 | 22 | 23 | 24 |
| 31 | 32 | 33 | 34 |
| c1 | c2 | c3 | c4 |
|---|---|---|---|
| 41 | 42 | 43 | 44 |
| 51 | 52 | 53 | 54 |
Then, in every row group, RCFile partitions the data vertically like column-store. Thus, the table will be serialized as:
Column data compression[edit]
Within each row group, columns are compressed to reduce storage space usage. Since data of a column are stored adjacently, the pattern of a column can be detected and thus the suitable compression algorithm can be selected for a high compression ratio.
Performance Benefits[edit]
Column-store is more efficient when a query only requires a subset of columns, because column-store only read necessary columns from disks but row-store will read an entire row.
RCFile combines merits of row-store and column-store via horizontal-vertical partitioning. With horizontal partitioning, RCFile places all columns of a row in a single machine and thus can eliminate the extra network costs when constructing a row. With vertical partitioning, for a query, RCFile will only read necessary columns from disks and thus can eliminate the unnecessary local I/O costs. Moreover, in every row group, data compression can be done by using compression algorithms used in column-store.
For example, a database might have this table:
| EmpId | Lastname | Firstname | Salary |
|---|---|---|---|
| 10 | Smith | Joe | 40000 |
| 12 | Jones | Mary | 50000 |
| 11 | Johnson | Cathy | 44000 |
| 22 | Jones | Bob | 55000 |
This simple table includes an employee identifier (EmpId), name fields (Lastname and Firstname) and a salary (Salary). This two-dimensional format exists only in theory, in practice, storage hardware requires the data to be serialized into one form or another.
In MapReduce-based systems, data is normally stored on a distributed system, such as Hadoop Distributed File System (HDFS), and different data blocks might be stored in different machines. Thus, for column-store on MapReduce, different groups of columns might be stored on different machines, which introduces extra network costs when a query projects columns placed on different machines. For MapReduce-based systems, the merit of row-store is that there is no extra network costs to construct a row in query processing, and the merit of column-store is that there is no unnecessary local I/O costs when read data from disks.
Row-oriented systems[edit]
The common solution to the storage problem is to serialize each row of data, like this;
Row-based systems are designed to efficiently return data for an entire row, or an entire record, in as few operations as possible. This matches use-cases where the system is attempting to retrieve all the information about a particular object, say the full information about one contact in a rolodex system, or the complete information about one product in an online shopping system.
Row-based systems are not efficient at performing operations that apply to the entire data set, as opposed to a specific record. For instance, in order to find all the records in the example table that have salaries between 40,000 and 50,000, the row-based system would have to seek through the entire data set looking for matching records. While the example table shown above may fit in a single disk block, a table with even a few hundred rows would not, therefore multiple disk operations would be needed to retrieve the data.
Column-oriented systems[edit]
A column-oriented system serializes all of the values of a column together, then the values of the next column. For our example table, the data would be stored in this fashion;
The difference can be more clearly seen in this common modification:
Two of the records store the same value, 'Jones', therefore it is now possible to store this in the column-oriented system only once instead of twice. For many common searches, like 'find all the people with the last name Jones', the answer can now be retrieved in a single operation.
Whether or not a column-oriented system will be more efficient in operation depends heavily on the operations being automated. Operations that retrieve data for objects would be slower, requiring numerous disk operations to assemble data from different columns to build up a whole-row record. However, such whole-row operations are generally rare. In the majority of cases, only a limited subset of data is retrieved. In a rolodex application, for instance, operations collecting the first names and last names from many rows in order to build a list of contacts is far more common than operations reading the data for home address.
Adoption[edit]
Rcp Viewer
RCFile has been adopted in real-world systems for big data analytics.
- RCFile became the default data placement structure in Facebook's production Hadoop cluster.[1] By 2010 it was the world's largest Hadoop cluster,[2] where 40 terabytes compressed data sets are added every day.[3] In addition, all the data sets stored in HDFS before RCFile have also been transformed to use RCFile .[1]
- RCFile has been adopted in Apache Hive (since v0.4),[4] which is an open source data store system running on top of Hadoop and is being widely used in various companies around the world,[5] including several Internet services, such as Facebook, Taobao, and Netflix.[6]
- RCFile has been adopted in Apache Pig (since v0.7),[7] which is another open source data processing system being widely used in many organizations,[8] including several major Web service providers, such as Twitter, Yahoo, LinkedIn, AOL, and Salesforce.com.
- RCFile became the de facto standard data storage structure in Hadoop software environment supported by the Apache HCatalog project (formerly known as Howl[9]) that is the table and storage management service for Hadoop.[10] RCFile is supported by the open source Elephant Bird library used in Twitter for daily data analytics.[11]
Over the following years, other Hadoop data formats also became popular. In February 2013, an Optimized Row Columnar (ORC) file format was announced by Hortonworks.[12]A month later, the Apache Parquet format was announced, developed by Cloudera and Twitter.[13]
Application To Open Rcf File
See also[edit]
References[edit]
- ^ ab'Hive integration: HBase and Rcfile__HadoopSummit2010'. 2010-06-30.
- ^'Facebook has the world's largest Hadoop cluster!'. 2010-05-09.
- ^'Apache Hadoop India Summit 2011 talk 'Hive Evolution' by Namit Jain'. 2011-02-24.
- ^'Class RCFile'. Archived from the original on 2011-11-23. Retrieved 2012-07-21.
- ^'PoweredBy - Apache Hive - Apache Software Foundation'.
- ^'Hive user group presentation from Netflix (3/18/2010)'. 2010-03-19.
- ^'HiveRCInputFormat (Pig 0.17.0 API)'.
- ^'PoweredBy - Apache Pig - Apache Software Foundation'.
- ^Howl
- ^'HCatalog'. Archived from the original on 2012-07-20. Retrieved 2012-07-21.
- ^'Twitter's collection of LZO and Protocol Buffer-related Hadoop, Pig, Hive, and HBase code.: Kevinweil/elephant-bird'. 2018-12-15.
- ^Alan Gates (February 20, 2013). 'The Stinger Initiative: Making Apache Hive 100 Times Faster'. Hortonworks blog. Retrieved May 4, 2017.
- ^Justin Kestelyn (March 13, 2013). 'Introducing Parquet: Efficient Columnar Storage for Apache Hadoop'. Cloudera blog. Retrieved May 4, 2017.