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https://issues.apache.org/jira/browse/CASSANDRA-4131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13698911#comment-13698911
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Nicolas Lalevée commented on CASSANDRA-4131:
--------------------------------------------
FYI, I have used the Hive/Cassandra storage patch for some time now, only for
writes, and I had to modify some lines to make it work properly. I never took
time to figure out if it was because of my environment or if this is a real
bug. Maybe you should look into it.
It is about the precision of the timestamp. In the patches, the timestamp is
set to {{System.currentTimeMillis()}}. And as far as I understand, the command
line client of cassandra precision is in micro seconds. So if a write happen
once in the command line client, every writes from Hive will be ignore.
For instance, here are lines which I patched:
https://github.com/milliondreams/hive/blob/cas-support/cassandra-handler/src/main/java/org/apache/hadoop/hive/cassandra/serde/RegularTableMapping.java#L84
https://github.com/milliondreams/hive/blob/cas-support/cassandra-handler/src/main/java/org/apache/hadoop/hive/cassandra/serde/RegularTableMapping.java#L94
https://github.com/milliondreams/hive/blob/cas-support/cassandra-handler/src/main/java/org/apache/hadoop/hive/cassandra/serde/TransposedMapping.java#L45
https://github.com/milliondreams/hive/blob/cas-support/cassandra-handler/src/main/java/org/apache/hadoop/hive/cassandra/serde/TransposedMapping.java#L63
Instead I used: {{cc.setTimeStamp(FBUtilities.timestampMicros());}}
> Integrate Hive support to be in core cassandra
> ----------------------------------------------
>
> Key: CASSANDRA-4131
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4131
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jeremy Hanna
> Assignee: Edward Capriolo
> Labels: hadoop, hive
>
> The standalone hive support (at https://github.com/riptano/hive) would be
> great to have in-tree so that people don't have to go out to github to
> download it and wonder if it's a left-for-dead external shim.
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