Tian Hong Wang created HDFS-4669:
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Summary:
org.apache.hadoop.hdfs.server.datanode.TestBlockPoolManager fails using IBM java
Key: HDFS-4669
URL: https://issues.apache.org/jira/browse/HDFS-4669
Project: Hadoop HDFS
Issue Type: Bug
Components: test
Affects Versions: 2.0.3-alpha
Reporter: Tian Hong Wang
Fix For: 2.0.3-alpha
TestBlockPoolManager unit test fails with the following error message using IBM
java:
testFederationRefresh(org.apache.hadoop.hdfs.server.datanode.TestBlockPoolManager)
Time elapsed: 27 sec <<< FAILURE!
org.junit.ComparisonFailure: expected:<stop #[1
refresh #2]
> but was:<stop #[2
refresh #1]
>
The root cause is:
(1)if we want to remove the first NS, keep the second NS, it should be
conf.set(DFSConfigKeys.DFS_NAMESERVICES, ns2), not
conf.set(DFSConfigKeys.DFS_NAMESERVICES, ns1).
(2)Since HashMap & HashSet store the data in the random order way, so in ibm
java & Oracle java, HashMap get the random order <key, value> that causing the
random ns1&ns2 value. So in the code, it should use LinkedHashMap &
LinkedHashSet to keep the original order.
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