[LUCENE-2453] Make Index Output Buffer Size Configurable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0, 4.1
• Fix Version/s: 4.2, 6.0
• Component/s: core/store
• Lucene Fields: New, Patch Available
• Assignee: Simon Willnauer
• Reporter: Karthick Sankarachary
• Created: 10/May/10 06:42
• Updated: 28/Aug/22 12:26
• Resolved: 23/Jan/13 08:51

Description

Currently, the buffered index input class allows sub-classes and users thereof to specify a size for the input buffer, which by default is 1024 bytes. In practice, this option is leveraged by the simple file and compound segment index input sub-classes.

By the same token, it would be nice if the buffered index output class could open up it's buffer size for users to configure. In particular, this would allow sub-classes thereof to align the output buffer size, which by default is 16348 bytes, to that of the underlying directory's data unit. For example, a network-based directory might want to buffer data in multiples of it's maximum transmission unit. To use an existing use-case, the file system-based directory could potentially choose to align it's output buffer size to the operating system's file block size.

The proposed change to the buffered index output class involves defining a one-arg constructor that takes a user-defined buffer size, and a default constructor that uses the currently defined buffer size.

Issue Links

• is duplicated by: LUCENE-4549 Allow variable buffer size on BufferedIndexOutput
• is required by: LUCENE-2456 A Column-Oriented Cassandra-Based Lucene Directory