[jira] [Created] (IGNITE-3073) Possible thread starvation due to rebalancing

["Valentin Kulichenko (JIRA)" <ji...@apache.org>]

Valentin Kulichenko created IGNITE-3073:
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             Summary: Possible thread starvation due to rebalancing
                 Key: IGNITE-3073
                 URL: https://issues.apache.org/jira/browse/IGNITE-3073
             Project: Ignite
          Issue Type: Bug
          Components: cache
    Affects Versions: 1.5.0.final
            Reporter: Valentin Kulichenko
            Assignee: Valentin Kulichenko
            Priority: Critical
             Fix For: 1.6


We're currently rebalancing the utility cache in the system pool. This can cause starvation, for example in this scenario:

# Start several nodes and a cache with indexing configured.
# Continuously load the system with puts.
# Add one more node. It will join and will start processing put requests immediately.
# For each request, indexing processor will try to get binary metadata and will block on utility cache rebalance future. This will block all threads in the system pool.
# Utility cache rebalancing will be scheduled but will never start, because all threads in system pool are blocked.

I think we should rebalance utility cache synchronously in exchange worker, like we do with the marshaller cache.



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