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https://issues.apache.org/jira/browse/NUTCH-2590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16496741#comment-16496741
]
Sebastian Nagel commented on NUTCH-2590:
----------------------------------------
The old mapred SequenceFileOutputFormat provides a method
[getReaders(...)|https://hadoop.apache.org/docs/r2.7.4/api/org/apache/hadoop/mapred/SequenceFileOutputFormat.html#getReaders-org.apache.hadoop.conf.Configuration-org.apache.hadoop.fs.Path-],
the new
[o.a.h.mapreduce.lib.output.SequenceFileOutputFormat|https://hadoop.apache.org/docs/r2.7.4/api/org/apache/hadoop/mapreduce/lib/output/SequenceFileOutputFormat.html]
does not. Using MapFileOutputFormat does not work as it requires a different
output - not a single file but a directory containing "data" and "index".
> SegmentReader -get fails
> ------------------------
>
> Key: NUTCH-2590
> URL: https://issues.apache.org/jira/browse/NUTCH-2590
> Project: Nutch
> Issue Type: Bug
> Components: segment
> Affects Versions: 1.15
> Reporter: Sebastian Nagel
> Priority: Major
> Fix For: 1.15
>
>
> SegmentReader -get fails in local and (pseudo-)distributed mode:
> {noformat}
> % bin/nutch readseg -get crawl/segments/20180531124348/
> "https://nutch.apache.org/";
> SegmentReader: get 'https://nutch.apache.org/'
> Exception:
> java.io.FileNotFoundException: File
> file:.../crawl/segments/20180531124348/crawl_generate/part-r-00000/data does
> not exist
> at
> org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:611)
> at
> org.apache.hadoop.fs.RawLocalFileSystem.getFileLinkStatusInternal(RawLocalFileSystem.java:824)
> at
> org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:601)
> at
> org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:428)
> at
> org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1820)
> at
> org.apache.hadoop.io.MapFile$Reader.createDataFileReader(MapFile.java:456)
> at org.apache.hadoop.io.MapFile$Reader.open(MapFile.java:429)
> at org.apache.hadoop.io.MapFile$Reader.<init>(MapFile.java:399)
> at org.apache.hadoop.io.MapFile$Reader.<init>(MapFile.java:408)
> at
> org.apache.hadoop.mapreduce.lib.output.MapFileOutputFormat.getReaders(MapFileOutputFormat.java:98)
> at
> org.apache.nutch.segment.SegmentReader.getSeqRecords(SegmentReader.java:443)
> at
> org.apache.nutch.segment.SegmentReader.access$200(SegmentReader.java:72)
> at
> org.apache.nutch.segment.SegmentReader$3.run(SegmentReader.java:341)
> Exception:
> java.io.FileNotFoundException: File
> file:.../crawl/segments/20180531124348/crawl_parse/part-r-00000/data does not
> exist
> at
> org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:611)
> at
> org.apache.hadoop.fs.RawLocalFileSystem.getFileLinkStatusInternal(RawLocalFileSystem.java:824)
> at
> org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:601)
> at
> org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:428)
> at
> org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1820)
> at
> org.apache.hadoop.io.MapFile$Reader.createDataFileReader(MapFile.java:456)
> at org.apache.hadoop.io.MapFile$Reader.open(MapFile.java:429)
> at org.apache.hadoop.io.MapFile$Reader.<init>(MapFile.java:399)
> at org.apache.hadoop.io.MapFile$Reader.<init>(MapFile.java:408)
> at
> org.apache.hadoop.mapreduce.lib.output.MapFileOutputFormat.getReaders(MapFileOutputFormat.java:98)
> at
> org.apache.nutch.segment.SegmentReader.getSeqRecords(SegmentReader.java:443)
> at
> org.apache.nutch.segment.SegmentReader.access$200(SegmentReader.java:72)
> at
> org.apache.nutch.segment.SegmentReader$4.run(SegmentReader.java:353)
> {noformat}
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