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

["Mithun Radhakrishnan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-17169?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mithun Radhakrishnan updated HIVE-17169:
----------------------------------------
    Attachment: HIVE-17169.1-branch-2.patch

Patch for {{branch-2}}.

> Avoid extra 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
>         Attachments: HIVE-17169.1-branch-2.patch, HIVE-17169.1.patch
>
>
> 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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