问题现象

在使用benchmark装载数据时，启动执行命令时报如下错误ERROR: Protocol error. Session setup failed.

[root@wang run]# ./runDatabaseBuild.sh props.pg
# ------------------------------------------------------------
# Loading SQL file ./sql.common/tableCreates.sql
# ------------------------------------------------------------
Apr 23, 2024 3:57:37 PM org.postgresql.core.v3.ConnectionFactoryImpl openConnectionImpl
INFO: [b8377b71-ba17-477f-97b2-a729fdea90f5] Try to connect. IP: 192.168.181.90:5432
Protocol error.  Session setup failed.
Starting BenchmarkSQL LoadData

driver=org.postgresql.Driver
conn=jdbc:postgresql://192.168.181.90:5432/testdb
user=test
password=***********
warehouses=1
loadWorkers=4
fileLocation (not defined)
csvNullValue (not defined - using default 'NULL')

Apr 23, 2024 3:57:37 PM org.postgresql.core.v3.ConnectionFactoryImpl openConnectionImpl
INFO: [cf04f8ab-f727-4ae2-92ac-a337a4537340] Try to connect. IP: 192.168.181.90:5432
ERROR: Protocol error.  Session setup failed.
# ------------------------------------------------------------
# Loading SQL file ./sql.common/indexCreates.sql
# ------------------------------------------------------------
Apr 23, 2024 3:57:37 PM org.postgresql.core.v3.ConnectionFactoryImpl openConnectionImpl
INFO: [8e79b276-e832-43a2-b189-83683732fab8] Try to connect. IP: 192.168.181.90:5432
Protocol error.  Session setup failed.
# ------------------------------------------------------------
# Loading SQL file ./sql.common/foreignKeys.sql
# ------------------------------------------------------------
Apr 23, 2024 3:57:37 PM org.postgresql.core.v3.ConnectionFactoryImpl openConnectionImpl
INFO: [033cc430-a2d9-4891-95b5-5ae8eb7c5337] Try to connect. IP: 192.168.181.90:5432
Protocol error.  Session setup failed.
# ------------------------------------------------------------
# Loading SQL file ./sql.postgres/extraHistID.sql
# ------------------------------------------------------------
Apr 23, 2024 3:57:38 PM org.postgresql.core.v3.ConnectionFactoryImpl openConnectionImpl
INFO: [31b5b3bd-a8f2-4f80-936d-d10254cb0c45] Try to connect. IP: 192.168.181.90:5432
Protocol error.  Session setup failed.
# ------------------------------------------------------------
# Loading SQL file ./sql.postgres/buildFinish.sql
# ------------------------------------------------------------
Apr 23, 2024 3:57:38 PM org.postgresql.core.v3.ConnectionFactoryImpl openConnectionImpl
INFO: [e649c2fe-d196-48f0-9810-eed6f2f9d26a] Try to connect. IP: 192.168.181.90:5432
Protocol error.  Session setup failed.

问题定位与分析

根据报错信息中的关键信息 Protocol error及tableCreates.sql未执行成功，判断可能是benchmark与PG数据库建立连接的时候出问题了。由于是Protocol error，因此排查方向基本就是驱动包及benchmark的问题。这个时候就想到了，目前使用PG的驱动和benchmark编译代码是之前测试openGauss的时候编译的代码，自己潜意识的认为是可以兼容使用的。那么我就先尝试替换驱动，重新编译。

问题处理

在下载最新的pg15对应的驱动后，替换旧的驱动并重新编译benchmark，再次执行runDatabaseBuild.sh脚本，成功建立连接。

问题总结

这个问题其实挺简单，造成最主要的原因还是自己对于PG数据库和openGauss数据库兼容性认知有问题，由于openGauss是基于pg9.2开发驱动版本比较低，但是使用低版本编译的benchmark连接高版本PG15数据库，导致无法连接到数据库。
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