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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2019/08/05 07:36:36 UTC
[GitHub] [incubator-shardingsphere] tuohai666 commented on issue #2774:
OutOfMemoryError caused by excessive pagination
tuohai666 commented on issue #2774: OutOfMemoryError caused by excessive pagination
URL: https://github.com/apache/incubator-shardingsphere/issues/2774#issuecomment-518121907
I don't know the implementation of MyCat, but I think ShardingSphere don't have the problem.
ShardingSphere provide ways to save memory. Please follow the instructions below to reduce the memory cost.
1. Make a stream ResultSet:
**statement.setFetchSize(1);**
or
jdbc:postgresql://127.0.0.1:5432/demo?**defaultRowFetchSize=1**
2. Make sure the ExecuteEngine in MEMORY_STRICTLY Mode:
I noticed your SQL will be full routed to 200 nodes. (Everyone need to avoid full routing)
Any way, set the props max.connections.size.per.query more than 200. For example:
**max.connections.size.per.query: 300**
After 1&2, both jdbc and ShardingSphere will not fetch all data in memory.
For more details:
https://mp.weixin.qq.com/s?__biz=MzUzNjgwODk2Mw==&mid=2247483679&idx=1&sn=ee7335b72b9105a53a55ee59b42358b1&chksm=faf1da73cd8653656b0c56ba852a98d67eb67f4f36e294a8c08507f5c3dc3b6897a90b99ea53&scene=0&key=4062b15c04f483fc1db8d4359b898767266e0bca63e1553ea724f2bf8a298d9cb0562f695b0804411c278e9e3db279cf63de75965c6f84781027c9ab8495334243939bbfc2f8ee21bacda90671addb29&ascene=1&uin=MTM1ODcxNDE1&devicetype=Windows+7&version=62060833&lang=zh_CN&pass_ticket=CdqzKWxf9iryvwQkRSxKqGt8Wz3LIqnQyhtmzMOC6eY%3D
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