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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1808) TestBalancer waits forever, errs without giving information
Date Tue, 12 Apr 2011 01:15:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt Foley updated HDFS-1808:
-----------------------------

    Attachment: TestBalancer.java.patch

Replace the three infinite waits with 20-second timeouts.  Throw TimeoutException WITH useful
information as to current state.  Now if it errs in the future, at least we'll be able to
see why.

Replace the exact expected value with a bounded range (which can be set to "exact" if you
really want that).

Corrected a large number of comments that were out of date and incorrect.

Test now passes Hudson automated testing in connection with HDFS-1295, where it previously
failed.

Posted here for information, but I'm going to subordinate this bug to HDFS-1295 (which it
was blocking) and submit a single patch to that Jira.


> TestBalancer waits forever, errs without giving information
> -----------------------------------------------------------
>
>                 Key: HDFS-1808
>                 URL: https://issues.apache.org/jira/browse/HDFS-1808
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, name-node
>    Affects Versions: 0.22.0
>            Reporter: Matt Foley
>            Assignee: Matt Foley
>         Attachments: TestBalancer.java.patch
>
>
> In three locations in the code, TestBalancer waits forever on a condition.  Failures
result in Hudson/Jenkins "Timeout occurred" error message with no information about where
or why.  Need to replace with TimeoutExceptions that throw a stack trace and useful info about
the failure mode.
> In waitForHeartBeat(), it is waiting on an exact match for a value that may be coarsely
quantized -- i.e., significant deviation from the exact "expected" result may occur.  Replace
with an allowed range of result.

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