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https://issues.apache.org/jira/browse/CASSANDRA-6025?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Williams updated CASSANDRA-6025:
----------------------------------------
Reviewer: jbellis
> Deleted row resurrects if was not compacted in GC Grace Timeout due to
> thombstone read optimization in CollactionController
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-6025
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6025
> Project: Cassandra
> Issue Type: Bug
> Reporter: Oleg Anastasyev
> Attachments: 6025.diff
>
>
> How to reproduce:
> 1. Insert column
> 2. Flush, so you'll have sstable-1
> 3. Delete just inserted column
> 4. Flush, now you have sstable-2 as well
> 5. Left it uncompacted for more then gc grace time or just use 0, so you dont
> have to wait
> 6. Read data form column. You'll read just deleted column
> {code}
> /* add the SSTables on disk */
> // This sorts sstables in the order sstable-2, sstable-1
> Collections.sort(view.sstables, SSTable.maxTimestampComparator);
> //...
> for (SSTableReader sstable : view.sstables)
> {
> //...
> if (iter.getColumnFamily() != null)
> //...
> while (iter.hasNext())
> {
> OnDiskAtom atom = iter.next();
> // the problem is here. reading atom after gc grace time
> // makes this condition false. so tombstone from sstable-2
> // is not placed to temp container and is just thrown away.
> // On next iteration of outer for statement an original
> // data inserted in step 1 from sstable-1 will be read and
> // placed to temp.
> if (atom.getLocalDeletionTime() >= gcBefore)
> temp.addAtom(atom);
> //
> }
> // .. so at the end of the for statemet we resolve data from temp. which
> // do not have tombstone at all -> data are resurrected.
> container.addAll(temp, HeapAllocator.instance);
>
> }
> {code}
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