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- lock improvement suggestion

- lock improvement suggestion

2007-11-09       - By Nikolay Diakov

 Back
Reply:     1     2     3     4     5  

I have briefly reviewed the SimpleFSLock of Lucene 2.1 and 2.2. I see
that the lock release mechanism does not check the return value of delete:

  public void release() {
    lockFile.delete();
  }

On most linux-es this can never return false, however under some windows
FS if someone (a virus scanner) touches the file at the proper
(improper) time, one may get a delete failure and get a false value. In
the original code this means that the directory stays locked forever
(unless someone does double unlocking or until a clearLock from the lock
factory). For diagnosting purposes, it may be a good idea to throw an
exception in that case. Alternatively, release() may return a boolean up
the chain, however this may require more changes in the code using the
release(). Just a suggestion.

Cheers,
  Nikolay

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