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From "William Slacum (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3727) FileNotFoundException on failed/data during recovery
Date Tue, 14 Apr 2015 19:43:59 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494735#comment-14494735
] 

William Slacum commented on ACCUMULO-3727:
------------------------------------------

Unfortunately, I do not. I was debugging over the phone. I did confirm, from the a description
of the stack trace, it was being rethrown from {{TabletServerLogger#recover}}. 

> FileNotFoundException on failed/data during recovery
> ----------------------------------------------------
>
>                 Key: ACCUMULO-3727
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3727
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.5.2
>            Reporter: William Slacum
>
> Over night there was a mass failure of Accumulo (most likely due to too many mappers
for a job). After restarting Accumulo, one of the metadata tablets failed to load. There was
a log message showing a `FileNotFoundException` on the file `hdfs:///accumulo/recovery/<log
id>/failed/data`. Removing the `<log id>` directory from HDFS seemed to unclog the
jam and things came back (though potentially with data loss).
> I wanted to investigate why somewhere in the plumbing of `TabletServer`, `TabletServerLogger`,
and `SortedLogRecovery`, an attempt was made to use the `failure` file.
> I see in `SortedLogRecovery#sort` where the marker file gets created:
> {code}
> public void sort(String name, Path srcPath, String destPath) {
> ...
>       } catch (Throwable t) {
>         try {
>           // parent dir may not exist
>           fs.mkdirs(new Path(destPath));
>           fs.create(new Path(destPath, "failed")).close();
>         } catch (IOException e) {
>           log.error("Error creating failed flag file " + name, e);
>         }
>         log.error(t, t);
>       } finally {
> ...
> {code}
> I have not stepped out to figure out where/why the `failed` files gets included in the
list of recovered data dir.



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