[jira] [Commented] (OAK-3645) RDBDocumentStore: server time detection for DB2 fails due to timezone/dst differences

["Julian Reschke (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-3645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15008519#comment-15008519 ] 

Julian Reschke commented on OAK-3645:
-------------------------------------

(asked for advice in http://stackoverflow.com/questions/33755951/is-sqls-current-timestamp-when-used-over-jdbc-timezone-agnostic)

> RDBDocumentStore: server time detection for DB2 fails due to timezone/dst differences
> -------------------------------------------------------------------------------------
>
>                 Key: OAK-3645
>                 URL: https://issues.apache.org/jira/browse/OAK-3645
>             Project: Jackrabbit Oak
>          Issue Type: Technical task
>          Components: rdbmk
>    Affects Versions: 1.3.10, 1.2.8, 1.0.24
>            Reporter: Julian Reschke
>            Assignee: Julian Reschke
>
> We use {{CURRENT_TIMESTAMP(4)}} to ask the DB for it's system time.
> Apparently, at least with DB2, this might return a value that is off by a multiple of one hour (3600 * 1000ms) depending on whether the OAK instance and the DB run in different timezones.
> Known to work: both on the same machine.
> Known to fail: OAK in CET, DB2 in UTC, in which case we're getting a timestamp one hour in the past.
> At this time it's not clear whether the same problem occurs for other databases.



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