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From "Michael Neale (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-778) Error on query initialization - intermittent
Date Sun, 22 Apr 2007 12:00:19 GMT

    [ https://issues.apache.org/jira/browse/JCR-778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490717
] 

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 
     * {@link 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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