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https://issues.apache.org/jira/browse/KYLIN-3398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16507279#comment-16507279
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ASF GitHub Bot commented on KYLIN-3398:
---------------------------------------
coveralls commented on issue #152: KYLIN-3398 Fix inaccurate arithmetic
operations
URL: https://github.com/apache/kylin/pull/152#issuecomment-396025219
## Pull Request Test Coverage Report for [Build
3215](https://coveralls.io/builds/17411321)
* **0** of **2** **(0.0%)** changed or added relevant lines in **1** file
are covered.
* **1** unchanged line in **1** file lost coverage.
* Overall coverage remained the same at **24.172%**
---
| Changes Missing Coverage | Covered Lines | Changed/Added Lines | % |
| :-----|--------------|--------|---: |
|
[storage-hbase/src/main/java/org/apache/kylin/storage/hbase/lookup/LookupTableToHFileJob.java](https://coveralls.io/builds/17411321/source?filename=storage-hbase%2Fsrc%2Fmain%2Fjava%2Forg%2Fapache%2Fkylin%2Fstorage%2Fhbase%2Flookup%2FLookupTableToHFileJob.java#L236)
| 0 | 2 | 0.0%
<!-- | **Total:** | **0** | **2** | **0.0%** | -->
| Files with Coverage Reduction | New Missed Lines | % |
| :-----|--------------|--: |
|
[core-cube/src/main/java/org/apache/kylin/cube/inmemcubing/MemDiskStore.java](https://coveralls.io/builds/17411321/source?filename=core-cube%2Fsrc%2Fmain%2Fjava%2Forg%2Fapache%2Fkylin%2Fcube%2Finmemcubing%2FMemDiskStore.java#L553)
| 1 | 78.12% |
<!-- | **Total:** | **1** | | -->
| Totals | [](https://coveralls.io/builds/17411321)
|
| :-- | --: |
| Change from base [Build 3213](https://coveralls.io/builds/17411310): |
0.0% |
| Covered Lines: | 14795 |
| Relevant Lines: | 61207 |
---
##### 💛 - [Coveralls](https://coveralls.io)
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> Inaccurate arithmetic operation in LookupTableToHFileJob#calculateShardNum
> --------------------------------------------------------------------------
>
> Key: KYLIN-3398
> URL: https://issues.apache.org/jira/browse/KYLIN-3398
> Project: Kylin
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: jiatao.tao
> Priority: Major
>
> There're two issues with the following code:
> {code}
> private int calculateShardNum(KylinConfig kylinConfig, long dataSize) {
> long shardSize = kylinConfig.getExtTableSnapshotShardingMB() * 1024 *
> 1024;
> return dataSize < shardSize ? 1 : (int) (Math.ceil(dataSize /
> shardSize));
> {code}
> getExtTableSnapshotShardingMB returns an int. The multiplication is done
> using 32-bit arithmetic, and then used in a context that expects an
> expression of type "long".
> Second, Math.ceil expects a double. The integer division would lose some
> precision.
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