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https://issues.apache.org/jira/browse/KUDU-2671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17572570#comment-17572570
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ASF subversion and git services commented on KUDU-2671:
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Commit e572e59673f6dade62f96eb38b6417ef018bc7bf in kudu's branch
refs/heads/master from Alexey Serbin
[ https://gitbox.apache.org/repos/asf?p=kudu.git;h=e572e5967 ]
[catalog_manager] KUDU-2671 fix bug in CreatePartitionsForRange()
This patch fixes a bug in PartitionSchema::CreatePartitionsForRange().
The manifestation of the bug was the inability to add an unbounded range
with custom hash schema (e.g. [0, +inf)) by AlterTable due to a conflict
with already existing range (e.g., [-inf, 0)) when if fact there was no
conflict at all. The root cause was the assumption that PartitionSchema
contained information on the range to be added in its internal map
'hash_schema_idx_by_encoded_range_start_' but that wasn't the case,
so GetHashSchemaForRange() would return the table-wide hash schema for
the new range being added instead of proper range-specific hash schema.
That lead to incorrect updating of range boundaries in
UpdatePartitionBoundaries(), producing wrong results.
This patch also contains a new test scenario that allowed to reproduce
the issue: the new scenario is failing without the fix applied.
Change-Id: I33a2bdea2e71bf4b567664c0166e9fbc07c4b882
Reviewed-on: http://gerrit.cloudera.org:8080/18793
Tested-by: Kudu Jenkins
Reviewed-by: Mahesh Reddy <[email protected]>
Reviewed-by: Abhishek Chennaka <[email protected]>
Reviewed-by: Attila Bukor <[email protected]>
> Change hash number for range partitioning
> -----------------------------------------
>
> Key: KUDU-2671
> URL: https://issues.apache.org/jira/browse/KUDU-2671
> Project: Kudu
> Issue Type: Improvement
> Components: client, java, master, server
> Affects Versions: 1.8.0
> Reporter: yangz
> Assignee: Mahesh Reddy
> Priority: Major
> Labels: feature, roadmap-candidate, scalability
> Attachments: 屏幕快照 2019-01-24 下午12.03.41.png
>
>
> For our usage, the kudu schema design isn't flexible enough.
> We create our table for day range such as dt='20181112' as hive table.
> But our data size change a lot every day, for one day it will be 50G， but for
> some other day it will be 500G. For this case, it be hard to set the hash
> schema. If too big, for most case, it will be too wasteful. But too small,
> there is a performance problem in the case of a large amount of data.
>
> So we suggest a solution we can change the hash number by the history data of
> a table.
> for example
> # we create schema with one estimated value.
> # we collect the data size by day range
> # we create new day range partition by our collected day size.
> We use this feature for half a year, and it work well. We hope this feature
> will be useful for the community. Maybe the solution isn't so complete.
> Please help us make it better.
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