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https://issues.apache.org/jira/browse/JCR-778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490717
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Michael Neale commented on JCR-778:
-----------------------------------
OK looking a little deeper, the problem stems from:
public Lock makeLock(final String name) {
final File lockFile = new File(directory, name);
return new Lock() {
public boolean obtain() throws IOException {
if (DISABLE_LOCKS) {
return true;
}
return lockFile.createNewFile();
}
In FSDirectory in jackrabbit core. IT seems that it is using an empty file as a
lock, yet when you look at JRE source for createNewFile, it EXPLICITLY says not
to use this for file locking:
* Note: this method should <i>not</i> be used for file-locking, as
* the resulting protocol cannot be made to work reliably. The
* [EMAIL PROTECTED] java.nio.channels.FileLock FileLock}
* facility should be used instead.
So this is a problem I believe.
> Error on query initialization - intermittent
> --------------------------------------------
>
> Key: JCR-778
> URL: https://issues.apache.org/jira/browse/JCR-778
> Project: Jackrabbit
> Issue Type: Bug
> Components: indexing
> Affects Versions: 1.1, 1.2.2
> Environment: Linux Fedora Core 5, ext2 filesystem, Java 1.5 (Sun)
> Reporter: Michael Neale
>
> About 1 in ten times, I get the error as shown in the stack trace below. This
> happens when I run test, or when I start the app. The only way to resolve
> (when testing) seems to be to blow away the repository.
> It always happens at the point the query manager is accessed (triggering the
> query subsystem to start up). It DOES NOT cause an exception to be thrown
> back to the caller, I just noticed it in the logs. Basically the queries
> return NO data at all (and show up as test failures of course).
> In each case when I startup the system/test, if the repository exists I use
> it, and (for tests) clean it by deleting the root node of the user content,
> and then starting again, otherwise there is nothing that exciting.
> Please let me know if more info is needed.
> ERROR 05-03 15:54:39,386 (LazyQueryResultImpl.java:getResults:266)
> -Exception while executing query:
> java.io.IOException : No such file or directory
> at java.io.UnixFileSystem.createFileExclusively(Native Method)
> at java.io.File.createNewFile(File.java:850)
> at org.apache.jackrabbit.core.query.lucene.FSDirectory$1.obtain(
> FSDirectory.java:119)
> at org.apache.lucene.store.Lock.obtain(Lock.java:51)
> at org.apache.lucene.store.Lock$With.run(Lock.java:98)
> at org.apache.lucene.index.IndexReader.open(IndexReader.java:141)
> at org.apache.lucene.index.IndexReader.open(IndexReader.java:136)
> at
> org.apache.jackrabbit.core.query.lucene.AbstractIndex.getReadOnlyIndexReader(AbstractIndex.java:191)
> at org.apache.jackrabbit.core.query.lucene.MultiIndex.getIndexReader
> (MultiIndex.java:616)
> at
> org.apache.jackrabbit.core.query.lucene.SearchIndex.executeQuery(SearchIndex.java:384)
> at
> org.apache.jackrabbit.core.query.lucene.LazyQueryResultImpl.executeQuery(LazyQueryResultImpl.java
> :204)
> at
> org.apache.jackrabbit.core.query.lucene.LazyQueryResultImpl.getResults(LazyQueryResultImpl.java:244)
> at
> org.apache.jackrabbit.core.query.lucene.LazyQueryResultImpl.<init>(LazyQueryResultImpl.java
> :161)
> at
> org.apache.jackrabbit.core.query.lucene.QueryImpl.execute(QueryImpl.java:164)
> at org.apache.jackrabbit.core.query.QueryImpl.execute(QueryImpl.java:142)
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