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https://issues.apache.org/jira/browse/NUTCH-2279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph Naegele updated NUTCH-2279:
----------------------------------
Affects Version/s: (was: 1.11)
1.12
> LinkRank fails when using Hadoop MR output compression
> ------------------------------------------------------
>
> Key: NUTCH-2279
> URL: https://issues.apache.org/jira/browse/NUTCH-2279
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 1.12
> Reporter: Joseph Naegele
>
> When using MapReduce job output compression, i.e.
> {{mapreduce.output.fileoutputformat.compress=true}}, LinkRank can't read the
> results of its {{Counter}} MR job due to the additional, generated file
> extension.
> For example, using the default compression codec (which appears to be
> DEFLATE), the counter file is written to
> {{crawl/webgraph/_num_nodes_/part-00000.deflate}}. Then, the LinkRank job
> attempts to manually read this file to obtain the number of links using the
> following code:
> {code}
> FSDataInputStream readLinks = fs.open(new Path(numLinksPath, "part-00000"));
> {code}
> which fails because the file {{part-00000}} doesn't exist:
> {code}
> LinkAnalysis: java.io.FileNotFoundException: File
> crawl/webgraph/_num_nodes_/part-00000 does not exist
> at
> org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:606)
> at
> org.apache.hadoop.fs.RawLocalFileSystem.getFileLinkStatusInternal(RawLocalFileSystem.java:819)
> at
> org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:596)
> at
> org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:421)
> at
> org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.<init>(ChecksumFileSystem.java:140)
> at
> org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:341)
> at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:767)
> at
> org.apache.nutch.scoring.webgraph.LinkRank.runCounter(LinkRank.java:124)
> at
> org.apache.nutch.scoring.webgraph.LinkRank.analyze(LinkRank.java:633)
> at org.apache.nutch.scoring.webgraph.LinkRank.run(LinkRank.java:713)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at org.apache.nutch.scoring.webgraph.LinkRank.main(LinkRank.java:680)
> {code}
> To reproduce, add {{-D mapreduce.output.fileoutputformat.compress=true}} to
> the properties for {{bin/nutch linkrank ...}}
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