[jira] [Created] (HDFS-4669) org.apache.hadoop.hdfs.server.datanode.TestBlockPoolManager fails using IBM java

["Tian Hong Wang (JIRA)" <ji...@apache.org>]

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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