[jira] [Created] (IGNITE-14474) Improve error message in case rebalance fails

["Denis Chudov (Jira)" <ji...@apache.org>]

Denis Chudov created IGNITE-14474:
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             Summary: Improve error message in case rebalance fails
                 Key: IGNITE-14474
                 URL: https://issues.apache.org/jira/browse/IGNITE-14474
             Project: Ignite
          Issue Type: Improvement
            Reporter: Denis Chudov


Currently we can get a message like this when rebalance fails with an exception (examples from ignite 2.5, in newer versions the log messages were changed but the problem is still actual):
{code:java}
2019-11-27 13:41:14,504[WARN ][utility-#79%xxx%][GridDhtPartitionDemander] Rebalancing from node cancelled [grp=ignite-sys-cache, topVer=AffinityTopologyVersion [topVer=1932, minorTopVer=1], supplier=f014f30a-77f2-4459-aa5b-6c12907a7449, topic=0]. Supply message couldn't be unmarshalled: class o.a.i.IgniteCheckedException: Failed to unmarshal object with optimized marshaller
2019-11-27 13:41:14,504[INFO ][utility-#79%xxx%][GridDhtPartitionDemander] Cancelled rebalancing [grp=ignite-sys-cache, supplier=f014f30a-77f2-4459-aa5b-6c12907a7449, topVer=AffinityTopologyVersion [topVer=1932, minorTopVer=1], time=88 ms]
2019-11-27 13:41:14,508[WARN ][utility-#76%xxx%][GridDhtPartitionDemander] Rebalancing from node cancelled [grp=ignite-sys-cache, topVer=AffinityTopologyVersion [topVer=1932, minorTopVer=1], supplier=dfa5ee06-48c9-4458-ae55-48cc6ceda998, topic=0]. Supply message couldn't be unmarshalled: class o.a.i.IgniteCheckedException: Failed to unmarshal object with optimized marshaller
{code}
In the case above, a marshalling exception leads to rebalance failure which will never be resolved - i.e. the cluster enters into a erroneous state.

We should report issues like this as ERROR. The message should explain that the rebalance has failed, data for the cache was not fully copied to the node, the backup factor is not recovered and the cluster may not work correctly.



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