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From "Taras Ledkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-2310) Lock cache partition for affinityRun/affinityCall execution
Date Wed, 01 Jun 2016 11:55:59 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-2310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15310183#comment-15310183
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Taras Ledkov commented on IGNITE-2310:
--------------------------------------

I guess the method {{affinityRun(String cacheName, Object affKey, IgniteRunnable job, Map<String,
int[]> partsToLock)}} is useful.
May be this method should be private for the class {{IgniteComputeImpl}}. In this case we
could define public API more flexible.

> Lock cache partition for affinityRun/affinityCall execution
> -----------------------------------------------------------
>
>                 Key: IGNITE-2310
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2310
>             Project: Ignite
>          Issue Type: New Feature
>          Components: cache
>            Reporter: Valentin Kulichenko
>            Assignee: Taras Ledkov
>            Priority: Critical
>              Labels: community
>             Fix For: 1.7
>
>
> Partition of a key passed to {{affinityRun}} must be located on the affinity node when
a compute job is being sent to the node. The partition has to be locked on the cache until
the compute job is being executed. This will let to execute queries safely (Scan or local
SQL) over the data that is located locally in the locked partition.
> In addition Ignite Compute API has to be extended by adding {{affinityCall}} and {{affinityRun}}
methods that accept list of caches which partitions have to be locked at the time a compute
task is being executed.
> Test cases to validate the functionality:
> 1) local SQL query over data located in a concrete partition in multple caches.
> - create cache Organisation cache and create Persons cache.
> - collocate Persons by 'organisationID';
> - send {{affinityRun}} using 'organisationID' as an affinity key and passing Organisation
and Persons caches' names to the method to be sure that the partition will be locked on caches;
> - execute local SQL query "SELECT * FROM Persons as p, Organisation as o WHERE p.orgId=o.id'
on a changing topology. The result set must be complete, the partition over which the query
will be executed mustn't be moved to the other node. Due to affinity collocation the partition
number will be the same for all Persons that belong to particular 'organisationID'
> 2) Scan Query over particular partition that is locked when {{affinityCall}} is executed.
 
> UPD (YZ May, 31)
> # If closure arrives to node but partition is not there it should be silently failed
over to current owner.
> # I don't think user should provide list of caches. How about reserving only one partition,
but evict partitions after all partitions in all caches (with same affinity function) on this
node are locked for eviction. [~sboikov], can you please comment? It seems this should work
faster for closures and will hardly affect rebalancing stuff.
> # I would add method {{affinityCall(int partId, String cacheName, IgniteCallable)}} and
same for Runnable. This will allow me not to mess with affinity key in case I know partition
before.



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