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From "Denis Magda (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-3372) IgniteDataStreamer: pre-loading starvation if multiple streamers preload the same cache
Date Mon, 27 Jun 2016 11:35:52 GMT
Denis Magda created IGNITE-3372:
-----------------------------------

             Summary: IgniteDataStreamer: pre-loading starvation if multiple streamers preload
the same cache
                 Key: IGNITE-3372
                 URL: https://issues.apache.org/jira/browse/IGNITE-3372
             Project: Ignite
          Issue Type: Bug
            Reporter: Denis Magda
            Assignee: Denis Magda
            Priority: Critical


If to start preloading a cache from multiple streamers on a node that owns partitions that
are being preloaded then we will get performance degradation at some point in cases if:

- BinaryMarshaller is used;
- an entry key is a custom object for which we store data in metadata cache.

The main reason according to the thread dumps attached is a race-condition around 
{{org.apache.ignite.internal.processors.cache.GridCacheMapEntry.obsolete(GridCacheMapEntry.java:2888)}}

To improve the performance both {{GridDhtPartitionTopologyImpl.onRemove}} and {{GridDhtPartitionTopologyImpl.onAdded}}
must reuse a partition number that is hold in entry.




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