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https://issues.apache.org/jira/browse/HIVE-17411?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin reassigned HIVE-17411:
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> LLAP IO may incorrectly release a refcount in some cases
> --------------------------------------------------------
>
> Key: HIVE-17411
> URL: https://issues.apache.org/jira/browse/HIVE-17411
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
>
> Not sure why this doesn't happen much more often, actually.
> In a large stream whose buffers are not reused (e.g. a dictionary, that is
> locked once for all RGs), separated into many buffers (e.g. due to a small
> ORC compression buffer size), it may happen that some, but not all, buffers
> are evicted from cache.
> If CacheBuffer follows BufferChunk in the buffer list, the latter will be
> converted to ProcCacheChunk; it is possible for early refcount release logic
> from the former to release the refcount (for a dictionary it would always be
> released cause by definition there's no reuse), and then backtrack to the
> latter, and try to decref an uninitialized MemoryBuffer in ProcCacheChunk
> because ProcCacheChunk looks like a CacheChunk. PCC initial refcounts are
> released separately after the data is uncompressed.
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