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Is Lucene query provider tunable?

We are seeing very slow performance that all seem to point to the Lucene search engine using JIRA 6.3.  Our JIRA instance is running on a 32CPUx84GB machine, with 24GB configured for the JVM.  Despite not seeing any indicators that there is a resource shortage on the server, accessing Jira through the web interface is slow.  Browsing a project summary takes 26-30 seconds to respond.  While the searches take that long to return , the load average on the host is 0.77, and there are 0 processes with any IOWait percentage. 


If I do a thread dump there are 16 threads in this same place:

"http-bio-" daemon prio=10 tid=0x00007fe3c0001000 nid=0x21aa runnable [0x00007fe6f7b83000]
java.lang.Thread.State: RUNNABLE
at sun.misc.Unsafe.getByte(Native Method)
at java.nio.DirectByteBuffer.get(
at java.nio.ByteBuffer.get(
at java.nio.DirectByteBuffer.get(
at org.apache.lucene.index.SegmentTermEnum.scanTo(
at org.apache.lucene.index.TermInfosReader.get(
at org.apache.lucene.index.TermInfosReader.get(
at org.apache.lucene.index.SegmentReader.docFreq(



We reindex regularly...

If I turn on Profiling, the Lucene search provider typically uses about 98% of the time.


Any ideas?

2 answers

1 vote
Daniel Wester Community Leader Mar 09, 2015

Where is the JIRA home directory hosted and have you look at it's performance?

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