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https://issues.apache.org/jira/browse/CASSANDRA-7768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14267753#comment-14267753
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Benjamin Lerer commented on CASSANDRA-7768:
-------------------------------------------
The problem come from a conflict between {{Keyspace.open}} and
{{Config.setClientMode(true)}}.
When {{Config.setClientMode(true)}} is used a minimal configuration is used.
That configuration has some missing data which trigger the
{{NullPointerException}}.
The patch for CASSANDRA-8280 add a {{Keyspace.open}} within
{{UpdateStatement}}. Due to that on the latest 2.1 {{CQLSSTableWriter.addRow}}
will throw a {{NullPointerException}} even if only one {{CQLSSTableWriter}} is
used.
To avoid that problem you must not call {{Config.setClientMode(true)}} before
using {{CQLSSTableWriter}}.
Unfortunatly, you will then face CASSANDRA-8281.
> Error when creating multiple CQLSSTableWriters for more than one column
> family in the same keyspace
> ---------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-7768
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7768
> Project: Cassandra
> Issue Type: Bug
> Components: Hadoop
> Reporter: Paul Pak
> Assignee: Benjamin Lerer
> Priority: Minor
> Labels: cql3, hadoop
> Attachments: trunk-7768-v1.txt
>
>
> The reason why this occurs is if the keyspace has already been loaded (due to
> another column family being previously loaded in the same keyspace),
> CQLSSTableWriter builder only loads the column family via
> Schema.load(CFMetaData). However, Schema.load(CFMetaData) only adds to the
> Schema.cfIdMap without making the proper addition to the CFMetaData map
> belonging to the KSMetaData map.
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