Hi everybody,
we just recently upgraded to lucene 2.9 nightly build, since we needed some of
the comparator fixes. We got ooms with some ScoreDocComparators which are now
replaced with FieldComparators.
I refactored the usages of deprecated apis and changed only small things.
However during index updates, lucene now seems to leave files open.
The files are deleted, but the jvm is still holding filehandles on them:
-bash-3.2$ /usr/sbin/lsof | grep 31159| grep deleted
java 31159 asuser 72r REG 253,3 18596499 3680841
/var/APP/ME.local/lucene/indexWriter/editorialContent/_pzd.cfs (deleted)
java 31159 asuser 78r REG 253,3 2750904146 3035091
/var/APP/ME.local/lucene/indexWriter/items/_3e.cfs (deleted)
java 31159 asuser 381r REG 253,3 2750298670 3713134
/var/APP/ME.local/lucene-local/indexWriter/items/_3c.cfs (deleted)
java 31159 asuser 384r REG 253,3 41138379 3713132
/var/APP/ME.local/lucene-local/indexWriter/contributors/_gp.cfs (deleted)
java 31159 asuser 386r REG 253,3 18596353 3713127
/var/APP/ME.local/lucene-local/indexWriter/editorialContent/_pzb.cfs (deleted)
java 31159 asuser 429r REG 253,3 2750298670 3035086
/var/APP/ME.local/lucene/indexWriter/items/_3c.cfs (deleted)
Our lucene index is based on a shared index lying around on nfs. The shared
index is the one which gets all updates from our database. The lucene instances
will notice the updates and have a running
copy on a tmpfs ramdisk for performance reasons.
Since searching on the nfs index is very slow, we copy the index first to local
disk and use it temporarily for indexSearcher during update. Then we delete the
ramdisk index and replace it.
This is the method responsible for an indexSearcher update:
public void updateIndexSearcher() {
if (!isReaderUp2Date() && !disableUpdates) {
if (fileLockService.lock("locked for indexSearcher
update", false)) {
if (isIndexValid(getIndexWriterPath())) {
try {
log.info("updateIndexSearcher:
{} updating IndexSearcher", indexAlias);
long startTime =
System.currentTimeMillis();
// Temporary we need a copy of
the current local index
FileUtils.deleteDirectory(new
File(getTempIndexWriterLocalPath()));
Directory tmpDir =
FSDirectory.open(new File(getTempIndexWriterLocalPath()), lockFactory);
Directory.copy(directory,
tmpDir, false);
log.info("updateIndexSearcher:
finished copy of {} to {}", directory, tmpDir);
// Before switching the
reference of indexSearcher we
// create
// the new indexSearcher in a
temporary reference. Going
// this way we guarantee that
we've never a corrupt
// indexSearcher during
recreation.
IndexSearcher indexSearcherTmp
= new IndexSearcher(tmpDir, true);
// temporary store the
indexSearcher ref. for closing
IndexSearcher tempIndexSearcher
= indexSearcher;
log.info("updateIndexSearcher:
Now starting to read from {}", indexSearcherTmp.getIndexReader().directory());
indexSearcher =
indexSearcherTmp;
// Give all remaining searches
a chance to finish,
// before closing the
indexSearcher. Lucene doesn't seem
// to gracefully close
IndexSearcher (at least not in
// the current release
try {
Thread.sleep(15000);
} catch (InterruptedException
e) {
log.error("updateIndexSearcher: InterruptedException", e);
}
if (tempIndexSearcher != null)
tempIndexSearcher.close();
localDirectory.close();
log.info("updateIndexSearcher:
Now deleting {}. And starting to copy {} to {}", new Object[] {
getIndexWriterLocalPath(), tmpDir,
localDirectory
});
FileUtils.deleteDirectory(new
File(getIndexWriterLocalPath()));
// indexSearcher is now reading
from the tmp local index
// so
// we recreate the
localDirectory
localDirectory =
FSDirectory.open(new File(getIndexWriterLocalPath()), lockFactory);
Directory.copy(tmpDir,
localDirectory, true);
// and finally switch back to a
new localDirectory
tempIndexSearcher = new
IndexSearcher(localDirectory, true);
indexSearcher =
tempIndexSearcher;
indexSearcherTmp.close();
tmpDir.close();
log.info("updateIndexSearcher:
{} finished {}ms", indexAlias, System.currentTimeMillis() - startTime);
// set lastIndexSearcherUpdate
to value from
// index.properties since
indexReader is now up2date
lastIndexSearcherUpdate =
getLastUpdateTimestmp();
} catch (CorruptIndexException e) {
log.error("updateIndexSearcher:
" + indexAlias + " Index CorruptIndexException ", e);
} catch (IOException e) {
log.error("updateIndexSearcher:
" + indexAlias + " Index: IOException ", e);
} finally {
fileLockService.releaseLock();
}
} else {
log.warn("updateIndexSearcher: {} index
validation failed. Keeping old index.", indexAlias);
fileLockService.releaseLock();
}
} else {
log.info("updateIndexSearcher: {} Couldn't get
file lock...so I assume an index update is happening...no update of
IndexSearcher", indexAlias);
}
}
}
As far as I can see each IndexSearcher and Directory is closed properly. It
worked well with 2.4. Part of the refactoring I did which might be related is
to replace:
Directory tmpDir = FSDirectory.getDirectory(getTempIndexWriterLocalPath());
with
Directory tmpDir = FSDirectory.open(new File(getTempIndexWriterLocalPath()),
lockFactory);
and:
IndexSearcher indexSearcherTmp = new IndexSearcher(tmpDir);
with
IndexSearcher indexSearcherTmp = new IndexSearcher(tmpDir, true);
No errors in the logfiles, no catched exceptions, etc. I'm a kinda out of ideas
at the moment. I googled and tried couple of things
(IndexWriter.setUseCompoundFile(true), etc.) but didn't find a
solution. Any help is appreciated.
Cheers,
Thomas
--
Thomas Becker
Senior JEE Developer
net mobile AG
Zollhof 17
40221 Düsseldorf
GERMANY
Phone: +49 211 97020-195
Fax: +49 211 97020-949
Mobile: +49 173 5146567 (private)
E-Mail: mailto:thomas.bec...@net-m.de
Internet: http://www.net-m.de
Registergericht: Amtsgericht Düsseldorf, HRB 48022
Vorstand: Theodor Niehues (Vorsitzender), Frank Hartmann,
Kai Markus Kulas, Dieter Plassmann
Vorsitzender des
Aufsichtsrates: Dr. Michael Briem
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