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From "Dmitry Konstantinov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-10733) CassandraStore in write behind mode loses data when back-pressure is active
Date Tue, 18 Dec 2018 19:49:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-10733?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitry Konstantinov updated IGNITE-10733:
-----------------------------------------
    Ignite Flags:   (was: Docs Required)

> CassandraStore in write behind mode loses data when back-pressure is active
> ---------------------------------------------------------------------------
>
>                 Key: IGNITE-10733
>                 URL: https://issues.apache.org/jira/browse/IGNITE-10733
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache, cassandra
>    Affects Versions: 2.5, 2.6, 2.7
>            Reporter: Dmitry Konstantinov
>            Priority: Critical
>
> When WriteBehindStore writes data synchronously to an underline store using back-pressure
logic (storeSingleValue) - the operation is happened in a transaction. CassandraStore uses
presence of transaction to clarify is it a atomicity needed: if there is a transaction - CassandraStore
accumulates data in a session-local attribute. When transaction is committed WriteBehindStore
is notified about the related session end but CassandraStore is not notified (and not subscribed
using a session listener), as a result CassandraStore does not flush the accumulated values
in this cases and they are lost.



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