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 [email protected]: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}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
