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From "Alexey Kuznetsov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-3700) CacheWriter implementations should remove updated entries from the input collection
Date Thu, 16 Feb 2017 07:58:41 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-3700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869447#comment-15869447
] 

Alexey Kuznetsov commented on IGNITE-3700:
------------------------------------------

may be change ticket status ?

> CacheWriter implementations should remove updated entries from the input collection
> -----------------------------------------------------------------------------------
>
>                 Key: IGNITE-3700
>                 URL: https://issues.apache.org/jira/browse/IGNITE-3700
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache
>    Affects Versions: 1.7
>            Reporter: Valentin Kulichenko
>             Fix For: 2.0
>
>
> According to {{CacheWriter}} JavaDoc, bulk operations ({{writeAll}} and {{deleteAll}})
should remove successful entries from the input collection:
> {code}
>    * If this operation fails (by throwing an exception) after a partial success,
>    * the writer must remove any successfully written entries from the entries
>    * collection so that the caching implementation knows what succeeded and can
>    * mutate the cache.
> {code}
> We properly handle this in the cache store manager and throw {{CachePartialUpdateException}}
with the list of keys not removed from the original collection. However, the implementations
provided by Ignite ({{CacheStoreAdapter}}, {{CacheAbstractJdbcStore}}, etc.) ignore this and
simply iterate through entries without removing successful ones.
> Proper implementation should use {{Iterator}} and remove the entry after successful update:
> {code}
> @Override public void writeAll(Collection<Cache.Entry<? extends Integer, ? extends
Integer>> entries) throws CacheWriterException {
>     Iterator<Cache.Entry<? extends Integer, ? extends Integer>> it = entries.iterator();
>     while (it.hasNext()) {
>         Cache.Entry<? extends Integer, ? extends Integer> entry = it.next();
>         // Do actual write (can throw an exception).
>         it.remove();
>     }
> }
> {code}



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