That was fast! I was already writting a patch... just to see if it works. On Thu, Apr 8, 2010 at 12:02 PM, Uwe Schindler <u...@thetaphi.de> wrote:
> Hi Shai, hi Ruben, > > I will take care of this in > https://issues.apache.org/jira/browse/LUCENE-2074 where some parts of the > Tokenizer impl are rewritten. > > ----- > Uwe Schindler > H.-H.-Meier-Allee 63, D-28213 Bremen > http://www.thetaphi.de > eMail: u...@thetaphi.de > > > > -----Original Message----- > > From: Ruben Laguna [mailto:ruben.lag...@gmail.com] > > Sent: Thursday, April 08, 2010 11:51 AM > > To: java-user@lucene.apache.org > > Subject: Re: IndexWriter memory leak? > > > > I was investigating this a little further and in the JFlex mailing list > > I > > found [1] > > > > I don't know much about flex / JFlex but it seems that this guy resets > > the > > zzBuffer to 16384 or less when setting the input for the lexer > > > > > > Quoted from shef <she...@ya...> > > > > > > I set > > > > %buffer 0 > > > > in the options section, and then added this method to the lexer: > > > > /** > > * Set the input for the lexer. The size parameter really speeds > > things up, > > * because by default, the lexer allocates an internal buffer of > > 16k. For > > * most strings, this is unnecessarily large. If the size param is > > 0 or greater > > * than 16k, then the buffer is set to 16k. If the size param is > > smaller, then > > * the buf will be set to the exact size. > > * @param r the reader that provides the data > > * @param the size of the data in the reader. > > */ > > public void reset(Reader r, int size) { > > if (size == 0 || size > 16384) > > size = 16384; > > zzBuffer = new char[size]; > > yyreset(r); > > } > > > > > > So maybe there is a way to trim the zzBuffer this way (?). > > > > BTW, I will try to find out which is the "big token" in my dataset this > > afternoon. Thanks for the help. > > > > I actually workaround this memory problem for the time being by > > wrapping the > > IndexWriter in a class that periodically closes the IndexWriter and > > creates > > a new one, allowing the old to be GCed, but I would be really good if > > either > > JFlex or Lucene can take care of this zzBuffer going berserk. > > > > > > Again thanks for the quick response. /Rubén > > > > > > [1] > > https://sourceforge.net/mailarchive/message.php?msg_id=444070.38422.qm@ > > web38901.mail.mud.yahoo.com > > > > On Thu, Apr 8, 2010 at 11:32 AM, Shai Erera <ser...@gmail.com> wrote: > > > > > If we could change the Flex file so that yyreset(Reader) would check > > the > > > size of zzBuffer, we could trim it when it gets too big. But I don't > > think > > > we have such control when writing the flex syntax ... yyreset is > > generated > > > by JFlex and that's the only place I can think of to trim the buffer > > down > > > when it exceeds a predefined threshold .... > > > > > > Maybe what we can do is create our own method which will be called by > > > StandardTokenizer after yyreset is called, something like > > > trimBufferIfTooBig(int threshold) which will reallocate zzBuffer if > > it > > > exceeded the threshold. We can decide on a reasonable 64K threshold > > or > > > something, or simply always cut back to 16 KB. As far as I > > understand, that > > > buffer should never grow that much. I.e. in zzRefill, which is the > > only > > > place where the buffer gets resized, there is an attempt to first > > move back > > > characters that were already consumed and only then allocate a bigger > > > buffer. Which means only if there is a token whose size is larger > > than 16KB > > > (!?), will this buffer get expanded. > > > > > > A trimBuffer method might not be that bad .. as a protective measure. > > What > > > do you think? Of course, JFlex can fix it on their own ... but until > > that > > > happens ... > > > > > > Shai > > > > > > On Thu, Apr 8, 2010 at 10:35 AM, Uwe Schindler <u...@thetaphi.de> > > wrote: > > > > > > > > I would like to identify also the problematic document I have > > 10000 so, > > > > > what > > > > > would be the best way of identifying the one that it making > > zzBuffer to > > > > > grow > > > > > without control? > > > > > > > > Dont index your documents, but instead pass them directly to the > > analyzer > > > > and consume the tokenstream manually. Then visit > > > TermAttribute.termLength() > > > > for each Token. > > > > > > > > > > > > ------------------------------------------------------------------- > > -- > > > > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > > > > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > > > > > > > > > > > > > > > > -- > > /Rubén > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > -- /Rubén
