Richard Calaba created KYLIN-2104:
Summary: loader constraint violation: loader (instance of
org/apache/catalina/loader/WebappClassLoader) previously initiated loading for
a different type with name "com/google/protobuf/ByteString"
Issue Type: Bug
Affects Versions: v1.5.3
Environment: MapR 4.1 - Edge node
Reporter: Richard Calaba
Something very odd is with v.1.5.3 compilation & packaging scripts - it seems
that during compilation some req. library is missing or another version is
being used and this is not reported as a compilation error which is causing
issues later in runtime.
On my MapR 4.1 system - EDGE node which has all necessary access rights for
hbase/hive + other packaging tools installed I did this:
1) Followed the https://kylin.apache.org/development/howto_package.html - with
one exception - from git I am not clonning latest master branch but specific
released Kylin version using tag kylin-1.5.3
2) The bin package is compiled successfully without any errors being reported
(I believe test cases are skipped this way - so cannot say test cases run ok)
3) I then installed the successfully compiled Kylin 1.5.3 from sources and run
Kylin - all seems OK.
4) I defined and successfully build 2 cubes - no issues during the build
process. (Maybe except the fact that Cube size is reported to be 0 Kb on UI
having approx. 350 million rows processed during Build -> that looks more like
some other bug).
5) If I go to Insights tab in Kylin UI and run any query which should return
some data (350 mil. rows processed during build) I am getting an error:
a) 1st time I run any query - ERROR: loader constraint violation: loader
(instance of org/apache/catalina/loader/WebappClassLoader) previously initiated
loading for a different type with name "com/google/protobuf/ByteString"
b) 2nd and later times - ERROR says only "com/google/protobuf/ByteString"
6) If I STOP the Kylin -> replace the whole binary installation with the
officialy released binary package of Kylin 1.5.3 (for HBase 0.98/0.99) - I can
run my queries without any issue !!!!
The reason why I am reporting this bug on v 1.5.3 and not on latest released
sources 220.127.116.11 is that I have issues to have 18.104.22.168 working - see
https://issues.apache.org/jira/browse/KYLIN-2094 - Bin release fails in step #3
of the Build process and 22.214.171.124 compiled from sources doesn't work for me.
All points to some issues with incorrect dependencies being detected during
compilation and/or runtime ... maybe related to Google's Protobuffers ...???
Anyone has any idea how to debug this problem ?? Basically it makes both 1.5.3
and 126.96.36.199 not working on my system.
On different system (also MapR 4.1) few months back -> I didn't have those
issues -I was able successfully re-compile sources of 1.5.x versions including
some additional patches relased for them.
Beacuse no errror is reported during the Kylin compilation & packaging process
-> all indicates that there is some strange non-resolved dependency which was
OK on my previous MapR system but is different on my current MapR system. Could
be anything ...
I will try to attach the compiled binary package here so some guru can have a
look and let me know why "successfully" compiled Kylin from sources doesn't run
same as the original BIN release. (BTW my compiled archive is several 20+ MBs
larger than the released binary package ...)
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