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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7764) DirectoryScanner shouldn't abort the scan if one directory had an error
Date Tue, 01 Dec 2015 07:17:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033247#comment-15033247
] 

Rakesh R commented on HDFS-7764:
--------------------------------

Thanks a lot [~cmccabe] for the useful comments. I've attached new patch addressing the same.

> DirectoryScanner shouldn't abort the scan if one directory had an error
> -----------------------------------------------------------------------
>
>                 Key: HDFS-7764
>                 URL: https://issues.apache.org/jira/browse/HDFS-7764
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.0
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>         Attachments: HDFS-7764-01.patch, HDFS-7764-02.patch, HDFS-7764.patch
>
>
> If there is an exception while preparing the ScanInfo for the blocks in the directory,
DirectoryScanner is immediately throwing exception and coming out of the current scan cycle.
The idea of this jira is to discuss & improve the exception handling mechanism.
> DirectoryScanner.java
> {code}
>     for (Entry<Integer, Future<ScanInfoPerBlockPool>> report :
>         compilersInProgress.entrySet()) {
>       try {
>         dirReports[report.getKey()] = report.getValue().get();
>       } catch (Exception ex) {
>         LOG.error("Error compiling report", ex);
>         // Propagate ex to DataBlockScanner to deal with
>         throw new RuntimeException(ex);
>       }
> {code}



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