[jira] [Updated] (HDFS-7380) unsteady and slow performance when writing to file with block size >2GB

2014-11-07 Thread Adam Fuchs (JIRA) 

 [ 
https://issues.apache.org/jira/browse/HDFS-7380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Adam Fuchs updated HDFS-7380:
-
Attachment: BenchmarkWrites.java

> unsteady and slow performance when writing to file with block size >2GB
> ---
>
> Key: HDFS-7380
> URL: https://issues.apache.org/jira/browse/HDFS-7380
> Project: Hadoop HDFS
>  Issue Type: Bug
>Affects Versions: 2.4.0
>Reporter: Adam Fuchs
> Attachments: BenchmarkWrites.java
>
>
> Appending to a large file with block size > 2GB can lead to periods of really 
> poor performance (4X slower than optimal). I found this issue when looking at 
> Accmulo write performance in ACCUMULO-3303. I wrote a small test application 
> to isolate this performance down to some basic API calls (to be attached). A 
> description of the execution can be found here: 
> https://issues.apache.org/jira/browse/ACCUMULO-3303?focusedCommentId=14202830&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14202830
> The specific hadoop version was as follows:
> {code}
> [root@n1 ~]# hadoop version
> Hadoop 2.4.0.2.1.2.0-402
> Subversion g...@github.com:hortonworks/hadoop.git -r 
> 9e5db004df1a751e93aa89b42956c5325f3a4482
> Compiled by jenkins on 2014-04-27T22:28Z
> Compiled with protoc 2.5.0
> From source with checksum 9e788148daa5dd7934eb468e57e037b5
> This command was run using /usr/lib/hadoop/hadoop-common-2.4.0.2.1.2.0-402.jar
> {code}



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[jira] [Created] (HDFS-7380) unsteady and slow performance when writing to file with block size >2GB

2014-11-07 Thread Adam Fuchs (JIRA) 
Adam Fuchs created HDFS-7380:


 Summary: unsteady and slow performance when writing to file with 
block size >2GB
 Key: HDFS-7380
 URL: https://issues.apache.org/jira/browse/HDFS-7380
 Project: Hadoop HDFS
  Issue Type: Bug
Affects Versions: 2.4.0
Reporter: Adam Fuchs
 Attachments: BenchmarkWrites.java

Appending to a large file with block size > 2GB can lead to periods of really 
poor performance (4X slower than optimal). I found this issue when looking at 
Accmulo write performance in ACCUMULO-3303. I wrote a small test application to 
isolate this performance down to some basic API calls (to be attached). A 
description of the execution can be found here: 
https://issues.apache.org/jira/browse/ACCUMULO-3303?focusedCommentId=14202830&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14202830

The specific hadoop version was as follows:
{code}
[root@n1 ~]# hadoop version
Hadoop 2.4.0.2.1.2.0-402
Subversion g...@github.com:hortonworks/hadoop.git -r 
9e5db004df1a751e93aa89b42956c5325f3a4482
Compiled by jenkins on 2014-04-27T22:28Z
Compiled with protoc 2.5.0
>From source with checksum 9e788148daa5dd7934eb468e57e037b5
This command was run using /usr/lib/hadoop/hadoop-common-2.4.0.2.1.2.0-402.jar
{code}



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