Ben

Total activity 25
Last activity November 18, 2025 22:39
Member since June 08, 2020 16:02

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Ben created an article, April 09, 2025 21:38
Historical process fails to come up and reports "Packet len is out of range!"
1. Hybrid / Enterprise
2. Data Ingestion
ISSUE Historical server fails to come up and the following error is observed in the log file: 2019-12-16T10:11:06,965 WARN [main-SendThread(10.13.44.53:2181)] org.apache.zookeeper.ClientCnxn - Sess...
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Ben created an article, November 14, 2023 22:38
Migrating metadata from Postgres to MySQL
1. Hybrid / Enterprise
2. Installation and Operations
OBJECTIVE: To migrate the metadata database from Postgres to MySQL. ADDITIONAL INFORMATION: This article is specifically about migrating metadata from Postgres to MySQL. Overall steps for mi...
- Edited August 19, 2024 16:29
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Ben created an article, September 28, 2020 20:34
Getting exact count(distinct) results, using druid SQL
1. Hybrid / Enterprise
2. Querying and Data Analysis
OBJECTIVE: To get exact count(distinct) results using druid SQL. ADDITIONAL INFORMATION: It's very difficult to get exact count(distinct) results in distributed databases, including druid (and us...
- Edited February 01, 2021 20:02
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Ben created an article, September 08, 2020 20:59
Using single-dimension partitioning to improve read performance
1. Hybrid / Enterprise
2. Data Ingestion
OBJECTIVE: Use single-dimension partition to improve query performance for certain queries. (Queries which filter on that dimension.) ADDITIONAL INFORMATION: In some cases, it can be helpful to ha...
- Edited October 26, 2020 22:34
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