That is what I did in my implementation.
It is easy to implement this as a protected abstract method in
IndexInput, which uses synchronization (and seek(), read(byte
[],off,len). In the 'real" version just override it to do it properly
without using seek().
On Dec 19, 2006, at 7:40 PM, Yonik Seeley (JIRA) wrote:
[ http://issues.apache.org/jira/browse/LUCENE-753?
page=comments#action_12459805 ]
Yonik Seeley commented on LUCENE-753:
-------------------------------------
CSIndexInput synchronization could also be elimitated if there was
a pread added to IndexInput
public abstract void readBytes(byte[] b, int offset, int len,
long fileposition)
Unfortunately, that would break any custom Directory based
implementations out there, and we can't provide a suitable default
with seek & read because we don't know what object to synchronize on.
Worth it or not???
Use NIO positional read to avoid synchronization in FSIndexInput
----------------------------------------------------------------
Key: LUCENE-753
URL: http://issues.apache.org/jira/browse/LUCENE-753
Project: Lucene - Java
Issue Type: New Feature
Components: Store
Reporter: Yonik Seeley
Attachments: FSIndexInput.patch
As suggested by Doug, we could use NIO pread to avoid
synchronization on the underlying file.
This could mitigate any MT performance drop caused by reducing the
number of files in the index format.
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