Hi All,
I need some help in analyzing some contentions we observe in the Lucene
execution.
We are supporting the Sterling 9.0 fulfillment application and it uses
Lucene 2.4 for catalog search functionality.
---The Issue----
This system is Live in production since Nov 2012 and only recently (Mid June
2013) our application is forming stuck threads during lucene invocations,
this causes our application to crash.
This occurs 2 - 3 times a week, on other days we see spikes of very slow
performance on the exact places that causes stuck threads.
---The research---
We have validated that the data or the usage has not grown between Jan 2012
& now.
We took snapshot of the code execution (through visual VM) and for slow
running treads we validated that too much time is spent at certain spots
(these very same spots appear in the stack trace of the stuck threads).
---Help needed---
If you can guide me on what kind of contentions (heap, IO, Data, CPU, JVM
params) can cause such a behavior it will really help.
---Lucene Invocation contentions observed---
(We find stuck threads & slowness at the following spots, ordered in the
order of severity [high to low])
1. java.io.RandomAccessFile.readBytes(Native Method)
java.io.RandomAccessFile.read(RandomAccessFile.java:338)
org.apache.lucene.store.FSDirectory$FSIndexInput.readInternal(FSDirectory.java:596)
org.apache.lucene.store.BufferedIndexInput.readBytes(BufferedIndexInput.java:136)
2. org.apache.lucene.index.TermBuffer.toTerm(TermBuffer.java:122)
org.apache.lucene.index.SegmentTermEnum.term(SegmentTermEnum.java:167)
org.apache.lucene.search.FieldCacheImpl$10.createValue(FieldCacheImpl.java:373)
org.apache.lucene.search.FieldCacheImpl$Cache.get(FieldCacheImpl.java:71)
org.apache.lucene.search.FieldCacheImpl.getStringIndex(FieldCacheImpl.java:351)
3. org.apache.lucene.store.IndexInput.readVInt(IndexInput.java:80)
org.apache.lucene.index.TermBuffer.read(TermBuffer.java:65)
org.apache.lucene.index.SegmentTermEnum.next(SegmentTermEnum.java:127)
org.apache.lucene.search.FieldCacheImpl$10.createValue(FieldCacheImpl.java:389)
org.apache.lucene.search.FieldCacheImpl$Cache.get(FieldCacheImpl.java:71)
org.apache.lucene.search.FieldCacheImpl.getStringIndex(FieldCacheImpl.java:351)
4. java.io.RandomAccessFile.seek(Native Method)
org.apache.lucene.store.FSDirectory$FSIndexInput.readInternal(FSDirectory.java:591)
org.apache.lucene.store.BufferedIndexInput.readBytes(BufferedIndexInput.java:136)
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