Hi Marcel, Thanks for you reply. I'll make the change.
-- Unico On Thu, Oct 9, 2014 at 1:47 PM, Marcel Reutegger <[email protected]> wrote: > Hi, > > so far we basically left it up to the application using Jackrabbit > to decide whether SimpleFSDirectory should be used or not. In many > cases you know if your threads may get interrupted. On the other > hand it might indeed be better to have a safe default. I'd be OK > to change the default to useSimpleFSDirectory=true. > > Regards > Marcel > > On 09/10/14 13:17, "Unico Hommes" <[email protected]> wrote: > >>Hi all, >> >>We have recently discovered a problem with the way Lucene index files >>are accessed in Jackrabbit 2 when running with the default repository >>configuration. >> >>For reading and writing its indexes Lucene can use different >>implementations. By default implementations are preferred based on >>the java.nio package. These implementations however have the following >>drawback: >> >>"Accessing this class either directly or indirectly from a thread >>while it's interrupted can close the underlying file descriptor >>immediately if at the same time the thread is blocked on IO. The file >>descriptor will remain closed and subsequent access to [this class] >>will throw a ClosedChannelException." >> >>So if the application at one point sets an interrupt on a thread that >>at the same time is accessing a Lucene index file, the file channel is >>closed and subsequent access will throw an exception. If that happens, >>the application needs to be reinitialized before the Lucene index can >>be used again. >> >>Refer to the discussion of this issue on the lucene developer list at [1]. >> >>To say the least, this is very brittle behaviour. >> >>Fortunately Jackrabbit SearchIndex can be configured with a parameter >>to use a different Lucene IO access implementation that does not >>suffer from this issue (useSimpleFSDirectory which causes Jackrabbit >>to use a FSDirectory that is based on access via >>java.io.RandomAccessFile). >> >>My question to the community is: would it be wise to make this the >>default? Applications using Jackrabbit which run into this issue will >>simply go down. This is a big price to pay for increased performance. >> >>1. http://marc.info/?l=lucene-dev&m=126466874929360&w=4 >> >>-- >>Unico >
