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From "Samarth Jain (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4176) Reduce chances of tests flapping with ColumnFamilyNotFoundException for HBase 1.x
Date Thu, 07 Sep 2017 06:37:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16156561#comment-16156561
] 

Samarth Jain commented on PHOENIX-4176:
---------------------------------------

One hack would be execute a select count(1) query. This query could potentially fail when
the regions are opening. Or they could succeed too when the table is in transitioning between
states. Either way, we can determine that the add column family operation is complete when
all the regions report back seeing the column family in the HTableDescriptor returned by CoProcessorEnvironment.getTable(TableName
tableName). Need to think more.

> Reduce chances of tests flapping with ColumnFamilyNotFoundException for HBase 1.x
> ---------------------------------------------------------------------------------
>
>                 Key: PHOENIX-4176
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4176
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Samarth Jain
>            Assignee: Samarth Jain
>         Attachments: PHOENIX-4176.patch, PHOENIX-4176_v2.patch
>
>
> In HBase 1.x, when adding a new column family, the check to detect whether the HTableDescriptor
is updated isn't enough. Tests that add a new column family run the risk of flapping when
number of regions on the table are high (since the column family has to be added to all the
regions). Till we figure out a permanent solution for this, we can possibly decrease chances
of such tests from flapping by reducing number of regions/pre-splits and possibly configuring
hbase.online.schema.update.enable to false in our tests. 



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