Indexing tools unable to handle large MAF files

[blankenberg]

One example is the hg38 projected chr1 multiz100way from UCSC: http://hgdownload.soe.ucsc.edu/goldenPath/hg38/multiz100way/maf/chr1.maf.gz (5.9G gz'd, 66G gunzip'd)

maf_build_index.py chr1.maf
Traceback (most recent call last):
  File "/path_to/bin/maf_build_index.py", line 83, in <module>
    if __name__ == "__main__": main()
  File "/path_to/bin/maf_build_index.py", line 80, in main
    indexes.write( out )
  File "/path_to/lib/python2.7/site-packages/bx/interval_index_file.py", line 332, in write
    write_packed( f, ">I", base )
  File "/path_to/lib/python2.7/site-packages/bx/interval_index_file.py", line 463, in write_packed
    f.write( pack( pattern, *vals ) )
struct.error: 'I' format requires 0 <= number <= 4294967295

One possibility is to up the version number and store unsigned integers as unsigned long long >Q, which would max out at 18446744073709551615 vs 4294967295. Would double the packed size though.

Another potential workaround could be to break the MAF up into multiple files, but I haven't tested this.

xref: https://biostar.usegalaxy.org/p/18196/

[jxtx]

I think pushing the version is the right solution. Somebody just needs to
find time to work on this...

-- jt

On Fri, Jul 29, 2016 at 12:41 PM, Daniel Blankenberg <
notifications@github.com> wrote:

One example is the hg38 projected chr1 multiz100way from UCSC:
http://hgdownload.soe.ucsc.edu/goldenPath/hg38/multiz100way/maf/chr1.maf.gz
(5.9G gz'd, 66G gunzip'd)

maf_build_index.py chr1.maf
Traceback (most recent call last):
File "/path_to/bin/maf_build_index.py", line 83, in
if name == "main": main()
File "/path_to/bin/maf_build_index.py", line 80, in main
indexes.write( out )
File "/path_to/lib/python2.7/site-packages/bx/interval_index_file.py", line 332, in write
write_packed( f, ">I", base )
File "/path_to/lib/python2.7/site-packages/bx/interval_index_file.py", line 463, in write_packed
f.write( pack( pattern, *vals ) )
struct.error: 'I' format requires 0 <= number <= 4294967295

One possibility is to up the version number and store unsigned integers as
unsigned long long >Q, which would max out at 18446744073709551615 vs
4294967295. Would double the packed size though.

Another potential workaround could be to break the MAF up into multiple
files, but I haven't tested this.

xref: https://biostar.usegalaxy.org/p/18196/

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[poojanarang]

Thanks for looking into this.
This issue have been bothering us for several weeks. Hope to have a solution to this problem soon.

[jodyhey]

Any progress on this?
I just ran into what seems to be the same problem on a large MAF file (48Gb):

(base) /mnt/e/genemod/better_dNdS_models/drosophila/11_6_2020/cactus_work$ python /home/jodyhey/miniconda3/bin/maf_build_index.py drosophila_cactus.maf drosophila_cactus.mafindex

Traceback (most recent call last):
File "/home/jodyhey/miniconda3/bin/maf_build_index.py", line 82, in
main()
File "/home/jodyhey/miniconda3/bin/maf_build_index.py", line 77, in main
indexes.write(out)
File "/home/jodyhey/miniconda3/lib/python3.8/site-packages/bx/interval_index_file.py", line 351, in write
write_packed(f, ">I", base)
File "/home/jodyhey/miniconda3/lib/python3.8/site-packages/bx/interval_index_file.py", line 486, in write_packed
f.write(pack(pattern, *vals))
struct.error: 'I' format requires 0 <= number <= 4294967295

[nsoranzo]

@jodyhey No one is working on this issue, sorry, but pull requests are welcome!

[pkncsk]

Is there any update on this issue? with how .maf files have gotten bigger lately, this might become a more common issue.

here I ran the script on a 30 Gb .lzo file (85 Gb uncompressed)

python3 maf_index.py

Traceback (most recent call last):
  File "maf_index.py", line 75, in <module>
    main()
  File "maf_index.py", line 70, in main
    indexes.write(out)
  File "/home/pc575/jupyter-env-icelake/lib/python3.7/site-packages/bx/interval_index_file.py", line 351, in write
    write_packed(f, ">I", base)
  File "/home/pc575/jupyter-env-icelake/lib/python3.7/site-packages/bx/interval_index_file.py", line 486, in write_packed
    f.write(pack(pattern, *vals))
struct.error: 'I' format requires 0 <= number <= 4294967295