kangkaisen created KYLIN-2506:
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Summary: Refactor Global Dictionary
Key: KYLIN-2506
URL: https://issues.apache.org/jira/browse/KYLIN-2506
Project: Kylin
Issue Type: Improvement
Components: General
Affects Versions: v2.0.0
Reporter: kangkaisen
Assignee: kangkaisen
Fix For: v2.0.0
The main points of this refactor:
1 Fix the bug that the RemoveListener of LoadingCache swallowed any exceptions
when building the GlobalDict.
2 Fix the bug that the HDFS filename of DictSliceKey had Illegal characters.
3 Fix the bug that the HDFS filename of DictSliceKey maybe longer than 255.
4 Fix the bug that DictNode split failed if value length greater than 255 bytes.
5 Decouple the build and query of GlobalDict:
Abstract the builder of AppendTrieDictionary to AppendTrieDictionaryBuilder;
Add LoadingCache to AppendTrieDictionary and make AppendTrieDictionary is only
readable.
6 Remove dependence of LoadingCache when building the GlobalDict.
7 Abstract the HDFS operations to GlobalDictStore.
8 Abstract the metadata of GlobalDict to GlobalDictMetadata.
9 Delete CachedTreeMap.
10 Remove the support of multithreading concurrent build and I will add
distributed lock for GlobalDict later.
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