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From dlmarion <...@git.apache.org>
Subject [GitHub] accumulo pull request #260: ACCUMULO-4643 initial implementation
Date Wed, 31 May 2017 19:55:47 GMT
Github user dlmarion commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/260#discussion_r119457446
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/iterators/SortedKeyValueIterator.java
---
    @@ -147,4 +147,35 @@
        *              if not supported.
        */
       SortedKeyValueIterator<K,V> deepCopy(IteratorEnvironment env);
    +
    +  /**
    +   * Called when the client (i.e. calling iterator or the tserver) will support this
iterators ability to yield. If called (and true is returned), then when
    +   * next or seek is called this iterator may yield before finding the next top value
and key. When this happens, the yield position (returned by
    +   * getYieldPosition) will be used when this iterator is rebuilt to seek to the position
at which it yielded. This iterator can only yield if the user of this
    +   * iterator has called this method. Note that setYieldSupported will never be called
in row isolation mode.
    +   *
    +   * @return <tt>boolean</tt> True if this iterator supported yielding, false
otherwise.
    +   */
    +  default boolean setYieldSupported() {
    +    return false;
    +  }
    +
    +  /**
    +   * If setYieldSupported has been called and true was returned, then this method will
be called after every seek and next call.
    +   *
    +   * @return <tt>boolean</tt> true if the previous next or seek call has
yielded without finding the next top key.
    +   */
    +  default boolean hasYielded() {
    +    return false;
    +  }
    +
    +  /**
    +   * If hasYielded returned true, then this will return the key which will be used as
the start key (non-inclusive) of the range in the next seek call. No other
    +   * method will be called except for seek after calling this method.
    +   *
    +   * @return <tt>K</tt>
    +   */
    +  default K getYieldPosition() {
    --- End diff --
    
    Should this throw an IllegalStateException if hasYielded() returns false?


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