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From "Hiroshi Ikeda (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7278) Some bugs of HTableDesciptor
Date Wed, 05 Dec 2012 04:26:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510263#comment-13510263

Hiroshi Ikeda commented on HBASE-7278:

This class meaninglessly uses synchronized and volatile. But removing them might wake up potential
bugs somewhere.

Some of the methods return unmodifiable collection views, while the methods' contracts say
the return collection is immutable.
I don't sure which is wrong, the contract or the implementation.
In order to keep the compatibility, we should keep the contract and create a new collection
and wrap it by Collections.unmodifiable*.
> Some bugs of HTableDesciptor
> ----------------------------
>                 Key: HBASE-7278
>                 URL: https://issues.apache.org/jira/browse/HBASE-7278
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Hiroshi Ikeda
>            Priority: Minor
> There are some bugs of the class HTableDescriptor.
> {code}
>   public HTableDescriptor(final byte [] name) {
>     super();
>     setMetaFlags(this.name);
>     this.name = this.isMetaRegion()? name: isLegalTableName(name);
>     this.nameAsString = Bytes.toString(this.name);
>   }
> {code}
> I think "setMetaFlags(this.name)" should be "setMetaFlags(name)".
> {code}
>   /**
>    * Check passed byte buffer, "tableName", is legal user-space table name.
>    * @return Returns passed <code>tableName</code> param
>    * @throws NullPointerException If passed <code>tableName</code> is null
>    * @throws IllegalArgumentException if passed a tableName
>    * that is made of other than 'word' characters or underscores: i.e.
>    * <code>[a-zA-Z_0-9].
>    */
>   public static byte [] isLegalTableName(final byte [] tableName) {
>     if (tableName == null || tableName.length <= 0) {
>       throw new IllegalArgumentException("Name is null or empty");
>     }
> {code}
> The implementation is against the contract of throwing NullPointerException.
> I'm not sure the contract is wrong or the implementation is wrong.
> Also the contract of throwing IllegalArgumentException is a little different from the
actual implementation, and in general we must actually call this method and catch IllegalArgumentException
in order to know whether the given name can be used as a table name.
> I feel HTableDescriptor allows itself to be in invalid states, and I cannot fix the class
> I think we should start to remove implementing WritableComparable, but it might greatly
break the compatibility.

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