[PHOENIX-4503] Phoenix-Spark plugin doesn't release zookeeper connections

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 4.11.0

Environment

HBase 1.2 on Linux (Ubuntu, CentOS)

• Assignee: Unassigned
• Reporter: Suhas Nalapure
• Created: 27/Dec/17 12:40
• Updated: 05/Mar/18 20:12
• Resolved: 05/Mar/18 20:12

Description

1. Phoenix-Spark plugin doesn't release zookeeper connections
Example:

for(int i=0; i < 50; i++){
			Dataset<Row> df = sqlContext.read().format("org.apache.phoenix.spark")
					.option("table", "\"Sales\"").option("zkUrl", "localhost:2181")
					.load();
			df.show(2);
		}
		Thread.sleep(1000*60); 

When the above snippet is executed, we can see number of connections to 2181 increasing and not getting released until after the main thread wakes up from sleep and program ends as can be seen below (14 is the number of connections even before the program starts to run) :
netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
14
16:52:05
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
22
16:52:15
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
38
16:52:18
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
68
16:52:23
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
100
16:52:27
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
116
16:52:32
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
116
16:52:38
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
116
16:52:52
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
116
16:53:00
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
116
16:53:24
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
14
16:53:32
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
14
16:53:34
root@user1 ~ $

2. Instead if "jdbc" format is used to create Spark Dataframe, the connection count doesn't shoot up
Example:

for(int i=0; i < 50; i++){			
			Dataset<Row> df = sqlContext.read().format("jdbc")
					.option("url", "jdbc:phoenix:localhost:2181")
					.option("dbtable", "\"Sales\"")
					.option("driver", "org.apache.phoenix.jdbc.PhoenixDriver")
					.load();
			df.show(2);
		}
		Thread.sleep(1000*60);	

Connection counts during program execution(14 being the count before execution starts):

root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
14
17:00:42
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
14
17:00:43
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:00:46
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:00:50
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:00:55
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:01:12
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:01:18
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:01:28
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:01:34
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:01:37
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
16
17:01:39
root@user1 ~ $ netstat -anp | grep 2181|grep EST| wc -l; date +"%H:%M:%S"
14
17:02:07

Issue Links

• duplicates: PHOENIX-4489 HBase Connection leak in Phoenix MR Jobs
• is duplicated by: PHOENIX-4502 Phoenix-Spark plugin doesn't release zookeeper connections