[jira] [Commented] (NUTCH-2614) NPE in CrawlDbReader -stats on empty CrawlDb

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NUTCH-2614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16539876#comment-16539876 ] 

ASF GitHub Bot commented on NUTCH-2614:
---------------------------------------

sebastian-nagel closed pull request #357: NUTCH-2614 NPE in CrawlDbReader -stats on empty CrawlDb
URL: https://github.com/apache/nutch/pull/357
 
 
   

This is a PR merged from a forked repository.
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diff --git a/src/java/org/apache/nutch/crawl/CrawlDbReader.java b/src/java/org/apache/nutch/crawl/CrawlDbReader.java
index 7b8b13aa6..ea4c96467 100644
--- a/src/java/org/apache/nutch/crawl/CrawlDbReader.java
+++ b/src/java/org/apache/nutch/crawl/CrawlDbReader.java
@@ -550,8 +550,11 @@ public void processStatJob(String crawlDb, Configuration config, boolean sort)
 
     if (LOG.isInfoEnabled()) {
       LOG.info("Statistics for CrawlDb: " + crawlDb);
-      LongWritable totalCnt = ((LongWritable) stats.get("T"));
-      stats.remove("T");
+      LongWritable totalCnt = new LongWritable(0);
+      if (stats.containsKey("T")) {
+        totalCnt = ((LongWritable) stats.get("T"));
+        stats.remove("T");
+      }
       LOG.info("TOTAL urls:\t" + totalCnt.get());
       for (Map.Entry<String, Writable> entry : stats.entrySet()) {
         String k = entry.getKey();


 

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> NPE in CrawlDbReader -stats on empty CrawlDb
> --------------------------------------------
>
>                 Key: NUTCH-2614
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2614
>             Project: Nutch
>          Issue Type: Bug
>          Components: crawldb
>    Affects Versions: 1.14, 1.15
>            Reporter: Markus Jelsma
>            Priority: Major
>             Fix For: 1.15
>
>
> Got this in master:
> {code}
> Exception in thread "main" java.lang.NullPointerException
>         at org.apache.nutch.crawl.CrawlDbReader.processStatJob(CrawlDbReader.java:555)
>         at org.apache.nutch.crawl.CrawlDbReader.run(CrawlDbReader.java:914)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
>         at org.apache.nutch.crawl.CrawlDbReader.main(CrawlDbReader.java:980)
> {code}
> Not sure why it happens or which commit caused the problem.



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