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  1. Solr
  2. SOLR-10966

Add workaround for Hadoop-Common 2.7.2 incompatibility with Java 9


    • Type: Bug
    • Status: Resolved
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 6.6
    • Fix Version/s: 6.6.1, 6.7, 7.0
    • Component/s: Hadoop Integration, hdfs
    • Security Level: Public (Default Security Level. Issues are Public)
    • Labels:


      I did some testing to work around HADOOP-14586 and found a temporary solution. All tests pass with Java 9 build 175 (HDFS, Hadoop Auth / Kerberos).

      This is a temporary workaround until we can upgrade Hadoop, see SOLR-10951

      The trick here is a hack: The Hadoop Shell class tries to parse java.version system property, which is simply "9" on the Java 9 GA / release candidate. It contains no dots and is shorter than 3 characters. Hadoop tries to get the substring(0,3) and fails with an IndexOutOfBoundsException in clinit. To work around this, we do the following on early Solr startup / test startup (in a static analyzer, like we do for logging initialization):

      • set java.version system property to "1.9"
      • initialize the Shell class in Hadoop
      • restore the old value of java.version

      The whole thing is done in a doPrivileged. I ran some tests on Policeman Jenkins, everything works. The hack is only done, if we detect Java 9.


        1. SOLR-10966.patch
          9 kB
          Uwe Schindler
        2. SOLR-10966.patch
          9 kB
          Uwe Schindler

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              • Assignee:
                thetaphi Uwe Schindler
                thetaphi Uwe Schindler
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