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https://issues.apache.org/jira/browse/LUCENE-3586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155894#comment-13155894
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Luca Cavanna edited comment on LUCENE-3586 at 11/23/11 2:23 PM:
----------------------------------------------------------------

Hi Uwe,
I'm working with lucene 3.4 and jvm 1.6.0_23 64 bit. I have ulimit unlimited 
and /proc/sys/vm/max_map_count 65530. The index size is 76GB, I have problems 
with just one segment, the first and definitely the biggest one, on which the 
fdt is 22GB, tvf is 13GB, prx is 4.2GB, frq is 2.8GB, and so on (others are 
under 1GB). I tried to run the checkindex with -Xmx512m and -Xms512m. Here is 
my output:

Segments file=segments_kj numSegments=31 version=3.4 format=FORMAT_3_1 [Lucene 
3.1+]
  1 of 31: name=_1iz docCount=3186709
    compound=false
    hasProx=true
    numFiles=12
    size (MB)=41,902.362
    diagnostics = {optimize=true, mergeFactor=23, 
os.version=2.6.27.59-1POi-x86_64, os=Linux, lucene.version=3.4.0 1167142 - mike 
- 2011-09-09 09:02:09, source=merge, os.arch=amd64, java.version=1.6.0_23, 
java.vendor=Sun Microsystems Inc.}
    has deletions [delFileName=_1iz_r.del]
    test: open reader.........FAILED

Thanks, and please let me know if you have any questions.
                
      was (Author: lucacavanna):
    Hi Uwe,
I'm working with lucene 3.4 and jvm 1.6.0_23 64 bit. I have ulimit unlimited 
and /proc/sys/vm/max_map_count 65530. The index size is 76GB, I have problems 
with just one segment, the first and definitely the bigger one, on which the 
fdt is 22GB, tvf is 13GB, prx is 4.2GB, frq is 2.8GB, and so on (others are 
under 1GB). I tried to run the checkindex with -Xmx512m and -Xms512m. Here is 
my output:

Segments file=segments_kj numSegments=31 version=3.4 format=FORMAT_3_1 [Lucene 
3.1+]
  1 of 31: name=_1iz docCount=3186709
    compound=false
    hasProx=true
    numFiles=12
    size (MB)=41,902.362
    diagnostics = {optimize=true, mergeFactor=23, 
os.version=2.6.27.59-1POi-x86_64, os=Linux, lucene.version=3.4.0 1167142 - mike 
- 2011-09-09 09:02:09, source=merge, os.arch=amd64, java.version=1.6.0_23, 
java.vendor=Sun Microsystems Inc.}
    has deletions [delFileName=_1iz_r.del]
    test: open reader.........FAILED

Thanks, and please let me know if you have any questions.
                  
> Choose a specific Directory implementation running the CheckIndex main
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-3586
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3586
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Luca Cavanna
>            Assignee: Luca Cavanna
>            Priority: Minor
>
> It should be possible to choose a specific Directory implementation to use 
> during the CheckIndex process when we run it from its main.
> What about an additional main parameter?
> In fact, I'm experiencing some problems with MMapDirectory working with a big 
> segment, and after some failed attempts playing with maxChunkSize, I decided 
> to switch to another FSDirectory implementation but I needed to do that on my 
> own main.
> Should we also consider to use a FileSwitchDirectory?
> I'm willing to contribute, could you please let me know your thoughts about 
> it?

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