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Shaofeng SHI commented on KYLIN-3491: ------------------------------------- This error was happened in building an empty segment (20220101000000_20230101000000); On an empty segment, there is no dict info for the global dict. For example, in the previous segment, there is the global dict reference: {code:java} "BUYER_ACCOUNT.ACCOUNT_COUNTRY" : "/dict/DEFAULT.TEST_ACCOUNT/ACCOUNT_COUNTRY/7f7ba5c1-dedc-7958-e362-60554b977ace.dict", "TEST_KYLIN_FACT.TEST_COUNT_DISTINCT_BITMAP" : "/dict/DEFAULT.TEST_KYLIN_FACT/TEST_COUNT_DISTINCT_BITMAP/bc85a6c5-2054-4240-acf3-3f6174e390f0.dict" {code} But in the empty segment, it has no this: {code:java} "BUYER_ACCOUNT.ACCOUNT_COUNTRY" : "/dict/DEFAULT.TEST_ACCOUNT/ACCOUNT_COUNTRY/f591edbf-010e-245b-725c-17a4e90ead2e.dict" {code} > Improve the cube building process when using global dictionary > -------------------------------------------------------------- > > Key: KYLIN-3491 > URL: https://issues.apache.org/jira/browse/KYLIN-3491 > Project: Kylin > Issue Type: Improvement > Components: Job Engine > Reporter: Zhong Yanghong > Assignee: Zhong Yanghong > Priority: Major > Fix For: v2.5.0 > > Attachments: APACHE-KYLIN-3491.patch > > > By current cubing process, if the global dictionary is very large, since the > raw data records are unsorted, it's hard to encode raw values into ids for > the input of bitmap due to frequent swap of the dictionary slices. We need a > refined process. The idea is as follows: > # for each source data block, there will be a mapper generating the distinct > values & sort them > # encode the sorted distinct values and generate a shrunken dict for each > source data block. > # when building base cuboid, use the shrunken dict for each source data > block for encoding. -- This message was sent by Atlassian JIRA (v7.6.3#76005)