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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7764) DirectoryScanner shouldn't abort the scan if one directory had an error
Date Fri, 25 Aug 2017 18:25:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16141983#comment-16141983
] 

Arpit Agarwal commented on HDFS-7764:
-------------------------------------

Cherry-picked to branch-2.8.

> 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
>             Fix For: 2.9.0, 3.0.0-alpha1, 2.8.2
>
>         Attachments: HDFS-7764-01.patch, HDFS-7764-02.patch, HDFS-7764-03.patch, HDFS-7764-04.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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