[jira] [Created] (CASSANDRA-12453) AutoSavingCache does not store required keys making RowCacheTests Flaky

["sankalp kohli (JIRA)" <ji...@apache.org>]

sankalp kohli created CASSANDRA-12453:
-----------------------------------------

             Summary: AutoSavingCache does not store required keys making RowCacheTests Flaky
                 Key: CASSANDRA-12453
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12453
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: sankalp kohli
            Priority: Minor


RowCacheTests were flaky and while investigating, I found that it does not store all the keys to disk. 

The reason is that we use  OHCache and call hotKeyIterator on it. This is not guaranteed to return the number of keys we want. Here is the documentation from OHCache 

/**
     * Builds an iterator over the N most recently used keys returning deserialized objects.
     * You must call {@code close()} on the returned iterator.
     * <p>
     *     Note: During a rehash, the implementation might return keys twice or not at all.
     * </p>
     */
    CloseableIterator<K> hotKeyIterator(int n);



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)