X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/290274d8413e674d087542f247e944c1277bae2b..4cfb296612f7b483b56c36f119ca175def706d2f:/crunch_scripts/split-fastq.py diff --git a/crunch_scripts/split-fastq.py b/crunch_scripts/split-fastq.py index e8c87120c0..17aabf2930 100755 --- a/crunch_scripts/split-fastq.py +++ b/crunch_scripts/split-fastq.py @@ -14,89 +14,116 @@ manifest_text = "" inp = arvados.CollectionReader(arvados.getjobparam('reads')) -prog = re.compile(r'(.*?)_1.fastq(.gz)?$') +manifest_list = [] -manifest_text = "" +chunking = False #arvados.getjobparam('chunking') -def readline(reader, start): - line = "" +def nextline(reader, start): n = -1 - while n == -1: - r = reader.readfrom(start, 1024) + while True: + r = reader.readfrom(start, 128) if r == '': break n = string.find(r, "\n") - line += r[0:n] - start += len(r) - return line - + if n > -1: + break + else: + start += 128 + return n + +# Chunk a fastq into approximately 64 MiB chunks. Requires that the input data +# be decompressed ahead of time, such as using decompress-all.py. Generates a +# new manifest, but doesn't actually move any data around. Handles paired +# reads by ensuring that each chunk of a pair gets the same number of records. +# +# This works, but in practice is so slow that potential gains in alignment +# performance are lost in the prep time, which is why it is currently disabled. +# +# A better algorithm would seek to a file position a bit less than the desired +# chunk size and then scan ahead for the next record, making sure that record +# was matched by the read pair. def splitfastq(p): for i in xrange(0, len(p)): p[i]["start"] = 0 p[i]["end"] = 0 - while True: - recordsize = [0, 0] + count = 0 + recordsize = [0, 0] - # read 4 lines starting at "start" - for ln in xrange(0, 4): - for i in xrange(0, len(p)): - r = readline(p[i]["reader"], p[i]["start"]) - if r == '': - return - recordsize[i] += len(r) + global piece + finish = False + while not finish: + for i in xrange(0, len(p)): + recordsize[i] = 0 - splitnow = False + # read next 4 lines + for i in xrange(0, len(p)): + for ln in xrange(0, 4): + r = nextline(p[i]["reader"], p[i]["end"]+recordsize[i]) + if r == -1: + finish = True + break + recordsize[i] += (r+1) + + splitnow = finish for i in xrange(0, len(p)): - if ((p[i]["end"] - p[i]["start"]) + recordsize[i]) >= arvados.BLOCKSIZE: + if ((p[i]["end"] - p[i]["start"]) + recordsize[i]) >= (64*1024*1024): splitnow = True if splitnow: for i in xrange(0, len(p)): - global piece - global manifest_text + global manifest_list + print >>sys.stderr, "Finish piece ./_%s/%s (%s %s)" % (piece, p[i]["reader"].name(), p[i]["start"], p[i]["end"]) manifest = [] - manifest.extend("./_" + str(piece)) - manifest.extend([d[arvados.LOCATOR] for d in p["reader"]._stream._data_locators]) - manifest.extend(["{}:{}:{}".format(seg[arvados.LOCATOR], seg[arvados.BLOCKSIZE], self.name().replace(' ', '\\040')) for seg in arvados.locators_and_ranges(p[i]["reader"].segments, p[i]["start"], p[i]["end"] - p[i]["start"])]) - manifest_text += manifest.join(" ") + "\n" + manifest.extend(["./_" + str(piece)]) + manifest.extend([d[arvados.LOCATOR] for d in p[i]["reader"]._stream._data_locators]) + manifest.extend(["{}:{}:{}".format(seg[arvados.LOCATOR]+seg[arvados.OFFSET], seg[arvados.SEGMENTSIZE], p[i]["reader"].name().replace(' ', '\\040')) for seg in arvados.locators_and_ranges(p[i]["reader"].segments, p[i]["start"], p[i]["end"] - p[i]["start"])]) + manifest_list.append(manifest) p[i]["start"] = p[i]["end"] + piece += 1 else: for i in xrange(0, len(p)): p[i]["end"] += recordsize[i] + count += 1 + if count % 10000 == 0: + print >>sys.stderr, "Record %s at %s" % (count, p[i]["end"]) +prog = re.compile(r'(.*?)(_[12])?\.fastq(\.gz)?$') +# Look for fastq files for s in inp.all_streams(): - if s.name() == ".": - for f in s.all_files(): - result = prog.match(f.name()) - if result != None: - p = [{}, {}] - p[0]["reader"] = s.files()[result.group(0)] - if result.group(2) != None: - p[1]["reader"] = s.files()[result.group(1) + "_2.fastq" + result.group(2)] - else: - p[1]["reader"] = s.files()[result.group(1) + "_2.fastq"] - splitfastq(p) - #m0 = p[0]["reader"].as_manifest()[1:] - #m1 = p[1]["reader"].as_manifest()[1:] - #manifest_text += "./_" + str(piece) + m0 - #manifest_text += "./_" + str(piece) + m1 - piece += 1 - -# No pairs found so just put each fastq file into a separate directory -if manifest_text == "": - for s in inp.all_streams(): - prog = re.compile("(.*?).fastq(.gz)?$") - if s.name() == ".": - for f in s.all_files(): - result = prog.match(f.name()) - if result != None: - p = [{}] - p[0]["reader"] = s.files()[result.group(0)] + for f in s.all_files(): + name_pieces = prog.match(f.name()) + if name_pieces is not None: + if s.name() != ".": + # The downstream tool (run-command) only iterates over the top + # level of directories so if there are fastq files in + # directories in the input, the choice is either to forget + # there are directories (which might lead to name conflicts) or + # just fail. + print >>sys.stderr, "fastq must be at the root of the collection" + sys.exit(1) + + p = None + if name_pieces.group(2) is not None: + if name_pieces.group(2) == "_1": + p = [{}, {}] + p[0]["reader"] = s.files()[name_pieces.group(0)] + p[1]["reader"] = s.files()[name_pieces.group(1) + "_2.fastq" + (name_pieces.group(3) if name_pieces.group(3) else '')] + else: + p = [{}] + p[0]["reader"] = s.files()[name_pieces.group(0)] + + if p is not None: + if chunking: splitfastq(p) - #m0 = p[0]["reader"].as_manifest()[1:] - #manifest_text += "./_" + str(piece) + m0 + else: + for i in xrange(0, len(p)): + m = p[i]["reader"].as_manifest().split() + m[0] = "./_" + str(piece) + manifest_list.append(m) piece += 1 +manifest_text = "\n".join(" ".join(m) for m in manifest_list) + "\n" + arvados.current_task().set_output(manifest_text)