[
https://issues.apache.org/jira/browse/LUCENE-1322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612911#action_12612911
]
Jason Rutherglen commented on LUCENE-1322:
------------------------------------------
Seeing a possible bug in this patch:
{noformat}
1) testSystem(org.apache.lucene.ocean.TestSystem)java.io.IOException: Negative
seek offset
at java.io.RandomAccessFile.seek(Native Method)
at
org.apache.lucene.store.FSDirectory$FSIndexInput.readInternal(FSDirectory.java:578)
at
org.apache.lucene.store.BufferedIndexInput.readBytes(BufferedIndexInput.java:131)
at
org.apache.lucene.index.CompoundFileReader$CSIndexInput.readInternal(CompoundFileReader.java:247)
at
org.apache.lucene.store.BufferedIndexInput.refill(BufferedIndexInput.java:152)
at
org.apache.lucene.store.BufferedIndexInput.readByte(BufferedIndexInput.java:38)
at org.apache.lucene.store.IndexInput.readInt(IndexInput.java:68)
at org.apache.lucene.store.IndexInput.readLong(IndexInput.java:91)
at org.apache.lucene.index.FieldsReader.doc(FieldsReader.java:212)
at org.apache.lucene.index.SegmentReader.document(SegmentReader.java:760)
at org.apache.lucene.index.IndexReader.document(IndexReader.java:572)
at org.apache.lucene.search.IndexSearcher.doc(IndexSearcher.java:92)
{noformat}
> Remove synchronization in CompoundFileReader
> --------------------------------------------
>
> Key: LUCENE-1322
> URL: https://issues.apache.org/jira/browse/LUCENE-1322
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.3.1
> Reporter: Jason Rutherglen
> Assignee: Michael McCandless
> Priority: Trivial
> Fix For: 2.4
>
> Attachments: lucene-1322.patch
>
>
> Currently there is what seems to be unnecessary synchronization in
> CompoundFileReader. This is solved by cloning the base IndexInput.
> Synchronization in low level IO classes creates lock contention on highly
> multi threaded Lucene installations, so much so that in many cases the CPU
> utilization never reaches the maximum without using something like
> ParallelMultiSearcher.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
