Caused by: org.postgresql.util.PSQLException: ERROR: connection to the remote node 10.20.30.195:5435 failed with the following error: could not fork new process for connection: Resource temporarily unavailable
服务器资源不足，可能是内存、linux共享内存段配置太低、overcommit超了或进程数。如：
CommitLimit: 199412136 kB Committed_AS: 199564684 kB # 接近limit时就可能提示资源临时不可用
### Cause: org.postgresql.util.PSQLException: ERROR: out of memory Detail: Failed on request of size 40364 in memory context "CacheMemoryContext". Where: while executing command on 10.20.30.217:5437 ; SQL []; ERROR: out of memory
内存不足、linux共享内存段配置太低、overcommit超了。
2021-12-31 14:03:21.441691C [unknown] lightdb@findptdis 10.20.30.193(12146) client backend SELECT 57P01[2021-12-31 13:45:14 UTC] 0 [71437] ERROR: terminating connection due to administrator command
服务器进程被正常或异常重启或停止或kill，包括具体的某个backend进程。
2PC未成功，回滚响应未收到，第二次重复回滚导致。