Alexey Goncharuk created IGNITE-6939:
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Summary: Exclude false owners from the execution plan based on
query response
Key: IGNITE-6939
URL: https://issues.apache.org/jira/browse/IGNITE-6939
Project: Ignite
Issue Type: Task
Security Level: Public (Viewable by anyone)
Reporter: Alexey Goncharuk
This is related to IGNITE-6858, the fix in the ticket can be improved.
The scenario leading to the issue is as follows:
1) Node A has partition 1 as owning
2) Node B has local partition map which has partition 1 on node A as owning
3) Topology change is triggered which would move partition 1 from A to another
node, topology version is X
4) A transaction is started on node B on topology X
5) Partition is rebalanced and node A moves partition 1 to RENTING and then to
EVICTED state, node A updates it's local partition map.
6) A new topology change is triggered
7) Node A sends partition map (transitively) to the node B, but since there is
a pending exchange, node B ignores the updated map and still thinks that A owns
partition 1 [1]
8) transaction attempts to execute an SQL query against partition 1 on node A
and retries infinitely
[1] The related code is in
GridDhtPartitionTopologyImpl#update(AffinityTopologyVersion,
GridDhtPartitionFullMap, CachePartitionFullCountersMap, Set,
AffinityTopologyVersion)
{code}
if (stopping || !lastTopChangeVer.initialized() ||
// Ignore message not-related to exchange if exchange is in progress.
(exchangeVer == null && !lastTopChangeVer.equals(readyTopVer)))
return false;
{code}
There are two possibilities to fix this:
1) Make all updates to partition map in a single thread, then we will not need
update sequences and then we can update local partition map even when there is
a pending exchange (this is a relatively big, but useful change)
2) Make a change in SQL query execution so that if a node cannot reserve a
partition, do not map the partition to this node on the same topology version
anymore (a quick fix)
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