An analysis of the strengths and weaknesses of Apache Arrow In my previous blog postI discussed the relatively new Apache Arrow project, and compared it with two similar column-oriented storage formats in ORC and Parquet.
Callaghan Request for Comments: Staubach Sun Microsystems, Inc. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
This is the significance of the specification not being on the standards track. Abstract This paper describes the NFS version 3 protocol. This paper is provided so that people can write compatible implementations.
Table of Contents 1.
Read from symbolic link. Create a symbolic link. Create a special device. Rename a file or directory. Create link to an object.
Extended read from directory.
Get dynamic file system information. Get static file system information. Commit cached data on a server to stable storage 92 4. Remove all mount entries. Introduction Sun's NFS protocol provides transparent remote access to shared file systems across networks.
The NFS protocol is designed to be machine, operating system, network architecture, and transport protocol independent. Implementations of the NFS version 2 protocol exist for a variety of machines, from personal computers to supercomputers. A description of the initial implementation can be found in [Sandberg].
The supporting MOUNT protocol performs the operating system-specific functions that allow clients to attach remote directory trees to a point within the local file system.
The mount process also allows the server to grant remote access privileges to a restricted set of clients via export control. The Network Lock Manager NLM protocol isolates the inherently stateful aspects of file locking into a separate protocol.
The purpose of this document is to: The normative text is the description of the RPC procedures and arguments and results, which defines the over-the-wire protocol, and the semantics of those procedures. The material describing implementation practice aids the understanding of the protocol specification and describes some possible implementation issues and solutions.
It is not possible to describe all implementations and the UNIX operating system implementation of the NFS version 3 protocol is most often used to provide examples.
Given that, the implementation discussion does not bear the authority of the description of the over-the-wire protocol itself. The need to support larger files and file systems has prompted extensions to allow 64 bit file sizes and offsets.
The revision enhances security by adding support for an access check to be done on the server. Performance modifications are of three types: The number of over-the-wire packets for a given set of file operations is reduced by returning file attributes on every operation, thus decreasing the number of calls to get modified attributes.
The write throughput bottleneck caused by the synchronous definition of write in the NFS version 2 protocol has been addressed by adding support so that the NFS server can do unsafe writes.
Unsafe writes are writes which have not been committed to stable storage before the operation returns. This specification defines a method for committing these unsafe writes to stable storage in a reliable way. Limitations on transfer sizes have been relaxed. The ability to support multiple versions of a protocol in RPC will allow implementors of the NFS version 3 protocol to define clients and servers that provide backwards compatibility with the existing installed base of NFS version 2 protocol implementations.
The extensions described here represent an evolution of the existing NFS protocol and most of the design features of the NFS protocol described in [Sandberg] persist.
See Changes from the NFS version 2 protocol on page 11 for a more detailed summary of the changes introduced by this revision. Each server supplies a program, which is a set of procedures.
The NFS service is one such program. The combination of host address, program number, version number, and procedure number specify one remote service procedure.
Servers can support multiple versions of a program by using different protocol version numbers.Feb 04, · Write a two-page report describing what you think the nature of the accounting function and the accounting information system in a large company will be like in the year Adapted from the CMA Examination.
Approx. words / page; Font: 12 point Arial/Times New Roman; Double line spacing; Any citation style (APA, MLA, Chicago/Turabian, Harvard) Free bibliography page.
Roland Kaufmann. The work presented here extends an existing algorithm for testing if an inclusion relation exists between two markup schemata, to only take into account the parts.
Write a 3-page paper describing Write a 3-page paper describing four types of failures that may occur in a distributed system. Specify which of these are also applicable to a centralized system.
Choose two of the four failures and describe how you would isolate and fix each failure. Prevent Plagiarism. Identify unoriginal content with the world’s most effective plagiarism detection solution.
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