Adam学习14之Fasta在Adam中的初始存储格式NucleotideContigFragment

更多Adam学习代码等资料请见：https://github.com/xubo245/AdamLearning

1.Fasta格式在Adam里面的Avro模式是NucleotideContigFragment，具体在package org.bdgenomics.formats.avro包下，这个包在bdg-formats项目下，更多的可以看git：https://github.com/bigdatagenomics/bdg-formats

2.参考2中有具体的fasta的操作，截取结果为：

{"contig": {"contigName": "chrUn_KN707606v1_decoy", "contigLength": 2200, "contigMD5": null, "referenceURL": null, "assembly": null, "species": null, "referenceIndex": null}, "description": "AC:KN707606.1  gi:734691250  LN:2200  rl:unplaced  M5:20c768ac79ca38077e5012ee0e5f8333  AS:hs38d1", "fragmentSequence": "ctagtagctgggactacaagcgcccgccaccacacccggctaatttttttgtatttttagtggagacaggtttcaccgtgttggccaggatggtctcgatctcctgaccttgtgatctgcccaccttgccctcccaaagtgctgggattacaggcatgagccaccatacccggcagTGTCCTATCCATTTTTAAGGCAGCCACTTGGAGTTGGAGCATGTCTTTCTCTCATAATCTCTTACCAGATGTCTCAGAGCAGCCTGTGCACTTTAACTCCAGACATTCTGCCACTGAGCCCCCTAGAGCTCCAGCTTTTAAAGCACTTGGGGTGAGCCTCGAGAGATGACAGACGGAGCTGCCCAAGAGCTGCCAGCTGCCAACCCTGCCTGGGGCTTCACGGCCCGCGCCCTACTTCCTCTCAGCTGGCTCCACACCCTGGGGCGTGTAATTTCCAAATTCTCACTCCCAGGGCTAATTTGGGGGATAAGACATTTGATTAGAAGTATCAgaaaccagctgggcatggtggctcacacctgtaatcccagcactttgggaggttatgactagaggatcatttgaactcaggaattcaagaccagcctggataacagtgagaccccatctctacaaaatataaacaattatgtgagcatggtggtgcacacctgtagtccctgttccttgggaggctgaggccggaggatcccttgagcccaggagttcaaggctgcagagagctgcgattgtgccactgcacactaacctgggagatagagcaagaacttgtctcagaaaaaaaaagtatcaggaaCTAATCTCCAGTCCTATCAAGTTAGGCATAAGGTCAATGTGTGATAGCTGAGTGTCACAGAAACCAAGGACAGGAATGCAACTGCCACTGGGGATGAACTGGAAGTGGGGAGTTAAACCACCTCAGAATGTccccatttttgtttcttctccagATGTGCTGCTTTGCTTTTCCGTATGTTTCTCTACGGACCAGCTACCTCTCCTCTGCCAACAGATCCAAGTTGTGCATGTTATGGGTCCAAACACCACGTGACAAGCCCATTCTTCCAGTTTCTCAGACCAGAAACTGCACTGTCCTCTAACTGCTTCTTCTCCCTCTTGCATCTGGTCCTTGGGGAAATCCTGTTTGCCCGGCCTTCAGCATATATCCACAGTTTAACCTTAACCACTCCTCGCCACCACTCGCGGGGGCGAGCAGCCTTCGCCCCCTGCCTAGATTACTACAGTAACTTCATTGTTCTTTCTACTTCTCTCTTTGCCCCTCTGCTATCTCAAAACAGCATCCAAAATGCACCTAGCAAGAGCATGTCATTCCTCTGCACAAAACTCTccaacttctctctttttttttttttttttttttttgagacggagtctcactctgtcacccaggctggagtgcaatagtgtgatcttggctcactgcaacctccacctcccagattcaagcgattctcctgcctcagcctcctgagtagctgagattacaggttcatgtcaccatgcccggctaatttttgtatttttagtagagacagggtttcaccatgttagtcaggctggtctcgaactcctgaccttgtgatccacccgcctcagcctcccaaagtgctgggattataggcatgagccaccgtgcatgacCAACTTCTCTTTTTGTTCAGAGTAAAAGCCAACGGCCCATGAGGCTTTCCATGGTCACGCCTCCGCTCATTCGCTCTGTGGCTTTGTCTTACACGGGTTCACTCCTCACTGGCCGCCTTGCTGACCCCATAGCTCACGGGCCTTACTCTGCTctcggggcctttgcacttgctccaCTGCAAATGCTCCTCCCCCAGAGGCCTTTGTGGCCCATTCCCTCGGTTCCTTAGGAACAATCCCTTCCCTGGTCAAACCTCCACTGACATCTGTCTCCTtcccttctgaattttttttctccgGTAGTATTTATCACTCTGCTATCCTTAGGATTTCCTTATCTTGTTTATCATCATCTCCTCATCCAGAGcttaagtcctttttttttttttgagatagagtctcgctctgtcgcccaggctggagtgcagtggcgcgatctcgtctcgctgaaagctccacctcccgggttcacgccattctcccgcctcagcctcccgagtagctgggactacaggcactcg", "fragmentNumber": 0, "fragmentStartPosition": 0, "fragmentLength": 2200, "numberOfFragmentsInContig": 1}

3.创建空的：

代码：

/**
 * @author xubo
 * Fasta/Fastq/SAM/BAM read
 */
package org.bdgenomics.adamLocal.algorithms.test

import org.apache.spark.SparkConf
import org.apache.spark.SparkContext
import org.bdgenomics.adam.rdd.ADAMContext
import org.bdgenomics.formats.avro.NucleotideContigFragment
import org.bdgenomics.formats.avro.Contig
//import scala.collection.parallel.Foreach

object NucleotideContigFragmentTest {
  def main(args: Array[String]) {
    val conf = new SparkConf().setAppName("FastaAndNucleotideContigFragment").setMaster("local")
    val sc = new SparkContext(conf)
    val ac = new ADAMContext(sc)
    val builder = NucleotideContigFragment.newBuilder()
    val contig = Contig.newBuilder
    builder.setContig(contig.build)
    val build1 = builder.build()
    println(build1);
    sc.stop

  }
}

结果：

{"contig": {"contigName": null, "contigLength": null, "contigMD5": null, "referenceURL": null, "assembly": null, "species": null, "referenceIndex": null}, "description": null, "fragmentSequence": null, "fragmentNumber": null, "fragmentStartPosition": null, "fragmentLength": null, "numberOfFragmentsInContig": null}

附加：通过分析ADAMContext中loadFasta方法，里面有调用package org.bdgenomics.adam.converters下的FastaConverter，里面有段代码创建了改格式，故可以参考

  def loadFasta(
    filePath: String,
    fragmentLength: Long): RDD[NucleotideClontigFragment] = {
    val fastaData: RDD[(LongWritable, Text)] = sc.newAPIHadoopFile(
      filePath,
      classOf[TextInputFormat],
      classOf[LongWritable],
      classOf[Text]
    )
    if (Metrics.isRecording) fastaData.instrument() else fastaData

    val remapData = fastaData.map(kv => (kv._1.get, kv._2.toString))

    FastaConverter(remapData, fragmentLength)
  }

    val fragments = sequencesAsFragments.zipWithIndex
      .map(si => {
        val (bases, index) = si

        val contig = Contig.newBuilder
          .setContigLength(sequenceLength)

        val builder = NucleotideContigFragment.newBuilder()
          .setFragmentSequence(bases)
          .setFragmentNumber(index)
          .setFragmentStartPosition(index * fragmentLength)
          .setNumberOfFragmentsInContig(fragmentCount)
          .setFragmentLength(bases.length)

        // map over optional fields
        name.foreach(contig.setContigName(_))
        description.foreach(builder.setDescription(_))
        builder.setContig(contig.build)
        // build and return
        builder.build()
      })

参考：

【1】https://github.com/xubo245/AdamLearning

【2】http://blog.csdn.net/xubo245/article/details/51288264

【3】https://github.com/bigdatagenomics/adam