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https://issues.apache.org/jira/browse/MAHOUT-2096?focusedWorklogId=458880&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-458880
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ASF GitHub Bot logged work on MAHOUT-2096:
------------------------------------------
Author: ASF GitHub Bot
Created on: 14/Jul/20 19:10
Start Date: 14/Jul/20 19:10
Worklog Time Spent: 10m
Work Description: balashashanka commented on pull request #401:
URL: https://github.com/apache/mahout/pull/401#issuecomment-658360710
Sure thanks.
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Issue Time Tracking
-------------------
Worklog Id: (was: 458880)
Time Spent: 0.5h (was: 20m)
> next() Called On Possible Empty iterator()
> ------------------------------------------
>
> Key: MAHOUT-2096
> URL: https://issues.apache.org/jira/browse/MAHOUT-2096
> Project: Mahout
> Issue Type: Bug
> Components: Algorithms
> Reporter: Shangru Li
> Priority: Minor
> Labels: easyfix, newbie
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Consider this function:
> {code}
> protected void reduce ( VarIntWritable index, Iterable<VarLongWritable> ids,
> Context
> ctx) throws IOException, InterruptedException {
> ctx.write(index, ids.iterator().next());
> }
> {code}
> The line `_ctx.write(index, ids.iterator().next());_` does not check for
> empty iterator when calling the next() function, which could result in an
> exception.
> Function can be found on the GitHub repository
> [here|https://github.com/apache/mahout/blob/754068bc3ac62bcf4b9b656cd4a6f413b29b18df/community/mahout-mr/mr/src/main/java/org/apache/mahout/cf/taste/hadoop/als/ParallelALSFactorizationJob.java#L395].
> Line 395, in file
> _/src/main/java/org/apache/mahout/cf/taste/hadoop/als/ParallelALSFactorizationJob.java_
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