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https://issues.apache.org/jira/browse/HDFS-6250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13977645#comment-13977645
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Chen He commented on HDFS-6250:
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In this test case, program starts a minicluster composed of 2 datanodes. Block
size is 10B and total cluster capacity is 6000B ( 3000B on each datanodes). It
create 180 data blocks with replication factor 2. Then, a node datanode is
created and balancer starts to balancing the cluster considering rack locality.
However, once balancer starts, HDFS creates a /system/balancer.id file (30B) to
track the balancer. After balancer successes, HDFS should delete the
/system/balancer.id file which is composed of 6 data blocks (2 replication for
each data block). But HDFS failed to delete 1 data block of this
/system/balancer.id file. This is why it reports 1810 data blocks instead of
1800.
> TestBalancerWithNodeGroup.testBalancerWithRackLocality fails
> ------------------------------------------------------------
>
> Key: HDFS-6250
> URL: https://issues.apache.org/jira/browse/HDFS-6250
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Chen He
> Attachments: test_log.txt
>
>
> It was seen in https://builds.apache.org/job/PreCommit-HDFS-Build/6669/
> {panel}
> java.lang.AssertionError: expected:<1800> but was:<1810>
> at org.junit.Assert.fail(Assert.java:93)
> at org.junit.Assert.failNotEquals(Assert.java:647)
> at org.junit.Assert.assertEquals(Assert.java:128)
> at org.junit.Assert.assertEquals(Assert.java:147)
> at org.apache.hadoop.hdfs.server.balancer.TestBalancerWithNodeGroup
> .testBalancerWithRackLocality(TestBalancerWithNodeGroup.java:253)
> {panel}
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