[
https://issues.apache.org/jira/browse/HBASE-13259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14365959#comment-14365959
]
Hadoop QA commented on HBASE-13259:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12705165/HBASE-13259.patch
against master branch at commit 99ec36614703fb191fa4093b86efdddf6aaa89ae.
ATTACHMENT ID: 12705165
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 4 new
or modified tests.
{color:red}-1 javac{color}. The patch appears to cause mvn compile goal to
fail with Hadoop version 2.4.1.
Compilation errors resume:
[ERROR] COMPILATION ERROR :
[ERROR]
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/bucket/TestFileMmapEngine.java:[27,31]
cannot find symbol
[ERROR]
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/bucket/TestFileMmapEngine.java:[35,11]
cannot find symbol
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.2:testCompile
(default-testCompile) on project hbase-server: Compilation failure: Compilation
failure:
[ERROR]
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/bucket/TestFileMmapEngine.java:[27,31]
cannot find symbol
[ERROR] symbol: class SmallTests
[ERROR] location: package org.apache.hadoop.hbase
[ERROR]
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/bucket/TestFileMmapEngine.java:[35,11]
cannot find symbol
[ERROR] symbol: class SmallTests
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please
read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :hbase-server
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/13289//console
This message is automatically generated.
> mmap() based BucketCache IOEngine
> ---------------------------------
>
> Key: HBASE-13259
> URL: https://issues.apache.org/jira/browse/HBASE-13259
> Project: HBase
> Issue Type: New Feature
> Components: BlockCache
> Affects Versions: 0.98.10
> Reporter: Zee Chen
> Fix For: 2.2.0
>
> Attachments: HBASE-13259.patch, ioread-1.svg, mmap-0.98-v1.patch,
> mmap-1.svg, mmap-trunk-v1.patch
>
>
> Of the existing BucketCache IOEngines, FileIOEngine uses pread() to copy data
> from kernel space to user space. This is a good choice when the total working
> set size is much bigger than the available RAM and the latency is dominated
> by IO access. However, when the entire working set is small enough to fit in
> the RAM, using mmap() (and subsequent memcpy()) to move data from kernel
> space to user space is faster. I have run some short keyval gets tests and
> the results indicate a reduction of 2%-7% of kernel CPU on my system,
> depending on the load. On the gets, the latency histograms from mmap() are
> identical to those from pread(), but peak throughput is close to 40% higher.
> This patch modifies ByteByfferArray to allow it to specify a backing file.
> Example for using this feature: set hbase.bucketcache.ioengine to
> mmap:/dev/shm/bucketcache.0 in hbase-site.xml.
> Attached perf measured CPU usage breakdown in flames graph.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
