Harvester assignment 2: Move to WARC writing instead of ARC writing

This assignment contains the subtasks needed to upgrade NetarchiveSuite to allow Heritrix to write to WARC files instead of ARC-files, including writing the contents of the metadata-1.arc files into WARC metadata records.

TBD: Should NetarchiveSuite still allow the user to write to ARC-files?BR Comment: Probably not, as this will complicate the post-processing, and indexing facilities of NetarchiveSuite

Tasks

Subtask 1: Replace the "ARCWriterProcesser" with "WARCWriterProcessor" in our Heritrix templates

Currently our harvest templates include the following piece of xml that configures Heritrix to write ARC files: 

 <map name="write-processors">
      <newObject name="Archiver" class="org.archive.crawler.writer.ARCWriterProcessor">
        <boolean name="enabled">true</boolean>
        <newObject name="Archiver#decide-rules" class="org.archive.crawler.deciderules.DecideRuleSequence">
          <map name="rules">
          </map>
        </newObject>
        <boolean name="compress">false</boolean>
        <string name="prefix">netarkivet</string>
        <string name="suffix">${HOSTNAME}</string>
        <long name="max-size-bytes">100000000</long>
        <stringList name="path">
          <string>arcs</string>
        </stringList>
        <integer name="pool-max-active">5</integer>
        <integer name="pool-max-wait">300000</integer>
        <long name="total-bytes-to-write">0</long>
        <boolean name="skip-identical-digests">false</boolean>
      </newObject>
    </map>

By replacing this piece of xml with the following, you tell Heritrix to write WARC-files: 

      <newObject name="WARCArchiver" class="org.archive.crawler.writer.WARCWriterProcessor">
        <boolean name="enabled">true</boolean>
        <newObject name="WARCArchiver#decide-rules" class="org.archive.crawler.deciderules.DecideRuleSequence">
          <map name="rules">
          </map>
        </newObject>
        <boolean name="compress">false</boolean>
        <string name="prefix">netarkivet</string>
        <string name="suffix">${HOSTNAME}</string>
        <long name="max-size-bytes">100000000</long>
        <stringList name="path">
          <string>warcs</string>
        </stringList>
        <integer name="pool-max-active">5</integer>
        <integer name="pool-max-wait">300000</integer>
        <long name="total-bytes-to-write">0</long>
        <boolean name="skip-identical-digests">false</boolean>
        <boolean name="write-requests">true</boolean>
        <boolean name="write-metadata">true</boolean>
        <boolean name="write-revisit-for-identical-digests">true</boolean>
        <boolean name="write-revisit-for-not-modified">true</boolean>
      </newObject>
    </map>

Estimated time: 2 MD