Saw the same error on https://issues.apache.org/jira/browse/HADOOP-4302
junit.framework.AssertionFailedError
at
org.apache.hadoop.mapred.TestReduceFetch.testReduceFromPartialMem(TestReduceFetch.java:119)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.extensions.TestSetup.run(TestSetup.java:23)
Chris, can you shed some light on what this test does, and whether it matters
if this test fails?
============================
[zshao branch-0.20] svn annotate
./src/test/org/apache/hadoop/mapred/TestReduceFetch.java
694459 cdouglas public void testReduceFromPartialMem() throws Exception {
694459 cdouglas JobConf job = mrCluster.createJobConf();
700918 cdouglas job.setNumMapTasks(5);
700918 cdouglas job.setInt("mapred.inmem.merge.threshold", 0);
694459 cdouglas job.set("mapred.job.reduce.input.buffer.percent", "1.0");
700918 cdouglas job.setInt("mapred.reduce.parallel.copies", 1);
700918 cdouglas job.setInt("io.sort.mb", 10);
700918 cdouglas job.set("mapred.child.java.opts", "-Xmx128m");
700918 cdouglas job.set("mapred.job.shuffle.input.buffer.percent",
"0.14");
700918 cdouglas job.setNumTasksToExecutePerJvm(1);
700918 cdouglas job.set("mapred.job.shuffle.merge.percent", "1.0");
694459 cdouglas Counters c = runJob(job);
718229 ddas final long hdfsWritten =
c.findCounter(Task.FILESYSTEM_COUNTER_GROUP,
718229 ddas
Task.getFileSystemCounterNames("hdfs")[1]).getCounter();
718229 ddas final long localRead =
c.findCounter(Task.FILESYSTEM_COUNTER_GROUP,
718229 ddas
Task.getFileSystemCounterNames("file")[0]).getCounter();
700918 cdouglas assertTrue("Expected at least 1MB fewer bytes read from
local (" +
700918 cdouglas localRead + ") than written to HDFS (" + hdfsWritten
+ ")",
700918 cdouglas hdfsWritten >= localRead + 1024 * 1024);
694459 cdouglas }
[zshao branch-0.20] svn log
./src/test/org/apache/hadoop/mapred/TestReduceFetch.java
...
------------------------------------------------------------------------
r718229 | ddas | 2008-11-17 04:23:15 -0800 (Mon, 17 Nov 2008) | 1 line
HADOOP-4188. Removes task's dependency on concrete filesystems. Contributed by
Sharad Agarwal.
------------------------------------------------------------------------
r700918 | cdouglas | 2008-10-01 13:57:36 -0700 (Wed, 01 Oct 2008) | 3 lines
HADOOP-4302. Fix a race condition in TestReduceFetch that can yield false
negatvies.
------------------------------------------------------------------------
r696640 | ddas | 2008-09-18 04:47:59 -0700 (Thu, 18 Sep 2008) | 1 line
HADOOP-3829. Narrown down skipped records based on user acceptable value.
Contributed by Sharad Agarwal.
------------------------------------------------------------------------
r694459 | cdouglas | 2008-09-11 13:26:11 -0700 (Thu, 11 Sep 2008) | 5 lines
HADOOP-3446. Keep map outputs in memory during the reduce. Remove
fs.inmemory.size.mb and replace with properties defining in memory map
output retention during the shuffle and reduce relative to maximum heap
usage.
------------------------------------------------------------------------
============================
Zheng
-----Original Message-----
From: Rama Ramasamy [mailto:[email protected]]
Sent: Tuesday, August 04, 2009 5:19 PM
To: [email protected]
Subject: TestReduceFetch fails on 64 bit java on branch 0.20 and y! hadoop
0.20.1
With JAVA_HOME set to 64 bit version of jvm, "ant test
-Dtestcase=TestReduceFetch" fails with error message
--
junit.framework.AssertionFailedError: Expected at least 1MB fewer bytes read
from local (21135390) than written to HDFS (21012480)
at
org.apache.hadoop.mapred.TestReduceFetch.testReduceFromPartialMem(TestReduceFetch.java:133)
...
The same test succeeds with 32 bit jvm. java version "1.6.0_07" is used on
both the cases.
This error is reproducible in both hadoop0.20 and hadoop0.20.1 (yahoo's release)
Anybody seen this issue?
Thanks
Rama
