[jira] [Created] (HIVE-17169) Avoid call to KeyProvider::getMetadata()

[Mithun Radhakrishnan (JIRA)]

Mithun Radhakrishnan created HIVE-17169:
-------------------------------------------

             Summary: Avoid call to KeyProvider::getMetadata()
                 Key: HIVE-17169
                 URL: https://issues.apache.org/jira/browse/HIVE-17169
             Project: Hive
          Issue Type: Bug
          Components: Shims
    Affects Versions: 3.0.0
            Reporter: Mithun Radhakrishnan
            Assignee: Mithun Radhakrishnan


Here's the code from {{Hadoop23Shims}}:

{code:title=Hadoop23Shims.java|borderStyle=solid}
    @Override
    public int comparePathKeyStrength(Path path1, Path path2) throws 
IOException {
      EncryptionZone zone1, zone2;

      zone1 = hdfsAdmin.getEncryptionZoneForPath(path1);
      zone2 = hdfsAdmin.getEncryptionZoneForPath(path2);

      if (zone1 == null && zone2 == null) {
        return 0;
      } else if (zone1 == null) {
        return -1;
      } else if (zone2 == null) {
        return 1;
      }

      return compareKeyStrength(zone1.getKeyName(), zone2.getKeyName());
    }

    private int compareKeyStrength(String keyname1, String keyname2) throws 
IOException {
      KeyProvider.Metadata meta1, meta2;

      if (keyProvider == null) {
        throw new IOException("HDFS security key provider is not configured on 
your server.");
      }

      meta1 = keyProvider.getMetadata(keyname1);
      meta2 = keyProvider.getMetadata(keyname2);

      if (meta1.getBitLength() < meta2.getBitLength()) {
        return -1;
      } else if (meta1.getBitLength() == meta2.getBitLength()) {
        return 0;
      } else {
        return 1;
      }
    }
  }
{code}

It turns out that {{EncryptionZone}} already has the cipher's bit-length stored 
in a member variable. One shouldn't need an additional name-node call 
({{KeyProvider::getMetadata()}}) only to fetch it again.



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