Wojtek Kozaczynski created LUCENE-6176:
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Summary: Modify FSIndexOutpue in FSDirectory to pen output steam
for Write and Read
Key: LUCENE-6176
URL: https://issues.apache.org/jira/browse/LUCENE-6176
Project: Lucene - Core
Issue Type: Improvement
Components: core/store
Affects Versions: 4.10.2
Environment: Windows
Reporter: Wojtek Kozaczynski
Fix For: 4.10.2
The FSIndexOutput, in FSDirecotry, opens the output file stream for
Write/Append (W/A), but no Read. This is an issue when Windos wites to remote
files. For local storage files the Windows cache manager is part of the kernel
and can read from the file even if it is opened for W/A only (and it needs to
read the current content of the page). When accessing remote files, like SMB
shares, the cache manager is restricted to the access mode requested from the
remote system. In this case since it is W/A every write, even a single byte, is
a roundtrip to the remote storage server.
Openning the output file stream for Write and Read, which does not impact other
functionality, allows Windows to cache the individual Lucene writes regadless
of their size
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