[Bug] gremlin语句执行超时 将导致内存泄漏statement未释放

[z7658329]

Bug Type (问题类型)

No response

Before submit

• 我已经确认现有的 Issues 与 FAQ 中没有相同 / 重复问题

Environment (环境信息)

Server Version: v0.11.x
Backend: mysql nodes, HDD or SSD
OS: 8 CPUs, 32 G RAM, Centos 7.x
Data Size: 50W vertices, 130W edges

Expected & Actual behavior (期望与实际表现)

1.当一个gremlin语句执行超时后，监控程序记录到该查询并未释放statement
2.gremlin语句为count语句，监控程序记录到该查询并未释放statement

监控monitor代码：

Expected & Actual behavior (期望与实际表现)

gremlin语法无论执行成功与否都会释放连接

Vertex/Edge example (问题点 / 边数据举例)

No response

Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

No response

[z7658329]

org.apache.tinkerpop.gremlin.server.handler.HttpGremlinEndpointHandler [] - Invalid request - responding with 500 Internal Server Error and Script evaluation exceeded the configured 'scriptEvaluationTimeout' threshold of 30000 ms or evaluation was otherwise cancelled directly for request [g.V("liujizheng6")]
java.util.concurrent.TimeoutException: Script evaluation exceeded the configured 'scriptEvaluationTimeout' threshold of 30000 ms or evaluation was otherwise cancelled directly for request [g.V("liujizheng6")]
at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$1(GremlinExecutor.java:315) ~[gremlin-groovy-3.4.3.jar:3.4.3]
at io.netty.util.concurrent.PromiseTask$RunnableAdapter.call(PromiseTask.java:38) [netty-all-4.1.13.Final.jar:4.1.13.Final]
at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:120) [netty-all-4.1.13.Final.jar:4.1.13.Final]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [netty-all-4.1.13.Final.jar:4.1.13.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) [netty-all-4.1.13.Final.jar:4.1.13.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:462) [netty-all-4.1.13.Final.jar:4.1.13.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [netty-all-4.1.13.Final.jar:4.1.13.Final]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]

[javeme]

@z7658329 Thanks for your analysis, it seems to have addressed the root cause.

ps: we can wrap log with code block (a pair of "```")

org.apache.tinkerpop.gremlin.server.handler.HttpGremlinEndpointHandler [] - Invalid request - responding with 500 Internal Server Error and Script evaluation exceeded the configured 'scriptEvaluationTimeout' threshold of 30000 ms or evaluation was otherwise cancelled directly for request [g.V("liujizheng6")]
java.util.concurrent.TimeoutException: Script evaluation exceeded the configured 'scriptEvaluationTimeout' threshold of 30000 ms or evaluation was otherwise cancelled directly for request [g.V("liujizheng6")]

[javeme]

related issue: #1626