Kaifeng Huang created MAHOUT-2095:
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Summary: Inconsistent library versions notice.
Key: MAHOUT-2095
URL: https://issues.apache.org/jira/browse/MAHOUT-2095
Project: Mahout
Issue Type: Improvement
Reporter: Kaifeng Huang
Attachments: apache mahout.pdf
Hi. I have implemented a tool to detect library version inconsistencies. Your
project have 2 inconsistent libraries.
Take com.google.guava:guava for example, this library is declared as version
14.0.1 in core, 11.0.2 in community/mahout-mr/mr and etc... Such version
inconsistencies may cause unnecessary maintenance effort in the long run. For
example, if two modules become inter-dependent, library version conflict may
happen. It has already become a common issue and hinders development progress.
Thus a version harmonization is necessary.
Provided we applied a version harmonization, I calculated the cost it may have
to harmonize to all upper versions including an up-to-date one. The cost refers
to POM config changes and API invocation changes. Take com.google.guava:guava
for example, if we harmonize all the library versions into 28.1-android. The
concern is, how much should the project code adapt to the newer library
version. We list an effort table to quantify the harmonization cost.
The effort table is listed below. It shows the overall harmonization effort by
modules. The columns represents the number of library APIs and API
calls(NA,NAC), deleted APIs and API calls(NDA,NDAC) as well as modified API and
API calls(NMA,NMAC). Modified APIs refers to those APIs whose call graph is not
the same as previous version. Take the first row for example, if upgrading the
library into version 28.1-android. Given that 84 APIs is used in module
community/mahout-mr/mr, 10 of them is deleted in a recommended version(which
will throw a NoMethodFoundError unless re-compiling the project), 68 of them is
regarded as modified which could break the former API contract.
||Index||Module||NA(NAC)||NDA(NDAC)||NMA(NMAC)||
|1|community/mahout-mr/mr|84(163)|10(12)|68(139)|
|2|core|19(37)|2(2)|17(35)|
Also we provided another table to show the potential files that may be affected
due to library API change, which could help to spot the concerned API usage and
rerun the test cases. The table is listed below.
||Module||File||Type||API||
|core|core/src/test/java/org/apache/mahout/math/set/HashUtilsTest.java|modify|com.google.common.collect.Lists.newArrayList()|
|core|core/src/test/java/org/apache/mahout/math/set/HashUtilsTest.java|modify|com.google.common.collect.HashMultiset.create()|
|core|core/src/main/java/org/apache/mahout/math/als/AlternatingLeastSquaresSolver.java|modify|com.google.common.base.Preconditions.checkArgument(boolean)|
|4|..|..|..|
If you are interested, you can have a more complete and detailed report in the
attached PDF file.
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