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From "Ivan Rakov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-9303) PageSnapshot can contain wrong pageId tag when not dirty page is recycling
Date Fri, 17 Aug 2018 13:29:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-9303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16583939#comment-16583939
] 

Ivan Rakov commented on IGNITE-9303:
------------------------------------

>From my point of view, the correct fix is:
1) PageMemoryImpl#beforeReleaseWrite - save real page ID (can be read via PageIO#getPageId)
to PageSnapshot instead of the passed one. We can also assert here that passed effectivePageId
is equal to saved inside page.
2) GridCacheDatabaseSharedManager#restoreMemory - when processing PAGE_RECORD, acquire writeLock
with restore = true flag (this will enforce skipping of tag check).

> PageSnapshot can contain wrong pageId tag when not dirty page is recycling
> --------------------------------------------------------------------------
>
>                 Key: IGNITE-9303
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9303
>             Project: Ignite
>          Issue Type: Bug
>    Affects Versions: 2.6
>            Reporter: Aleksey Plekhanov
>            Priority: Major
>             Fix For: 2.7
>
>
> When page is recycling (for example in {{BPlusTree.Remove#freePage()}} -> {{DataStructure#recyclePage()}})
tag of {{pageId}} is modified, but original {{pageId}} is passed to {{writeUnlock()}} method
and this passed {{pageId}} is stored to PageSnapshot WAL record.
> This bug may lead to errors in WAL applying during crash recovery.
> Reproducer (ignite-indexing module must be in classpath):
> {code:java}
> public class WalFailReproducer extends AbstractWalDeltaConsistencyTest {
>     @Override protected boolean checkPagesOnCheckpoint() {
>         return true;
>     }
>     public final void testPutRemoveCacheDestroy() throws Exception {
>         CacheConfiguration<Integer, Integer> ccfg = new CacheConfiguration<>("cache0");
>         ccfg.setIndexedTypes(Integer.class, Integer.class);
>         IgniteEx ignite = startGrid(0);
>         ignite.cluster().active(true);
>         IgniteCache<Integer, Integer> cache0 = ignite.getOrCreateCache(ccfg);
>         for (int i = 0; i < 5_000; i++)
>             cache0.put(i, i);
>         forceCheckpoint();
>         for (int i = 1_000; i < 4_000; i++)
>             cache0.remove(i);
>         forceCheckpoint();
>         stopAllGrids();
>     }
> }
> {code}



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