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https://issues.apache.org/jira/browse/HDFS-6912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14111571#comment-14111571
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Hadoop QA commented on HDFS-6912:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12664509/HDFS-6912.003.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 eclipse:eclipse{color}. The patch built with
eclipse:eclipse.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:red}-1 core tests{color}. The patch failed these unit tests in
hadoop-common-project/hadoop-common:
org.apache.hadoop.ha.TestZKFailoverControllerStress
{color:green}+1 contrib tests{color}. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-HDFS-Build/7779//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/7779//console
This message is automatically generated.
> SharedFileDescriptorFactory should not allocate sparse files
> ------------------------------------------------------------
>
> Key: HDFS-6912
> URL: https://issues.apache.org/jira/browse/HDFS-6912
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: caching
> Affects Versions: 2.5.0
> Environment: HDFS Data node, with 8 gb tmpfs in /dev/shm
> Reporter: Gopal V
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Attachments: HDFS-6912.001.patch, HDFS-6912.002.patch,
> HDFS-6912.003.patch
>
>
> SharedFileDescriptor factory should not allocate sparse files. Sparse files
> can lead to a SIGBUS later in the short-circuit reader when we try to read
> from the sparse file and memory is not available.
> Note that if swap is enabled, we can still get a SIGBUS even with a
> non-sparse file, since the JVM uses MAP_NORESERVE in mmap.
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