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From Iñigo Martinez (JIRA) <j...@apache.org>
Subject [jira] [Commented] (KYLIN-3562) TS conflict when kylin update metadata in HBase
Date Wed, 10 Apr 2019 15:04:00 GMT

    [ https://issues.apache.org/jira/browse/KYLIN-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16814524#comment-16814524
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Iñigo Martinez commented on KYLIN-3562:
---------------------------------------

For now, only once. But we upgraded to 2.6.1 from 2.4.1 yesterday and we also added the second
kylin node after upgrade to 2.6.1.

So, at this moment, once a day.

In order to avoid major problems, we have split users. So, we have created another admin for
certain critics API operations and also another analyst user for querying. Both are users
for specific applications. So, just in case this happen again, it won't have effect on online
web reports that we have published in our intranet.

This problem affected only to admin user.

> TS conflict when kylin update metadata in HBase
> -----------------------------------------------
>
>                 Key: KYLIN-3562
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3562
>             Project: Kylin
>          Issue Type: Bug
>    Affects Versions: v2.4.0
>            Reporter: Lingang Deng
>            Assignee: Jiatao Tao
>            Priority: Major
>             Fix For: v2.4.2, v2.5.1
>
>         Attachments: image-2018-09-17-16-40-56-212.png, image-2018-09-25-15-03-51-009.png,
image-2018-09-25-16-43-50-277.png
>
>
> Error log was as follows,
> {code:java}
> org.apache.kylin.common.persistence.WriteConflictException: Overwriting conflict /user/admin,
expect old TS 1536928877043, but it is 1536928907207
>          at org.apache.kylin.storage.hbase.HBaseResourceStore.checkAndPutResourceImpl(HBaseResourceStore.java:325)
>          at org.apache.kylin.common.persistence.ResourceStore.checkAndPutResourceCheckpoint(ResourceStore.java:318)
>          at org.apache.kylin.common.persistence.ResourceStore.putResource(ResourceStore.java:303)
>          at org.apache.kylin.common.persistence.ResourceStore.putResource(ResourceStore.java:282)
>          at org.apache.kylin.metadata.cachesync.CachedCrudAssist.save(CachedCrudAssist.java:192){code}
>  
> what disturbs me the most was that the error was happened several hours,  then my all
build job and query job failed.



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