Show You created HIVE-3335:
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Summary: Thousand of CLOSE_WAIT socket when we using
SymbolicInputFormat
Key: HIVE-3335
URL: https://issues.apache.org/jira/browse/HIVE-3335
Project: Hive
Issue Type: Bug
Components: Clients
Affects Versions: 0.8.1
Environment: CentOS 5.8 x64
CDH3u4
hadoop-0.20-0.20.2+923.256-1
hadoop-0.20-{namenode,secondarynamenode,jobtracker,tasktracker,datanode}-0.20.2+923.256-1
hadoop-0.20-conf-pseudo-0.20.2+923.256-1(but same error was
occurred on not pseudo env)
apache hive-0.8.1(but same error was occurred on hive 0.9)
Reporter: Show You
Procedure for reproduction:
1. Set up hadoop
2. Prepare data file and link.txt:
data:
$ hadoop fs -cat /path/to/data/2012-07-01/20120701.csv
1, 20120701 00:00:00
2, 20120701 00:00:01
3, 20120701 01:12:45
link.txt
$ cat link.txt
/path/to/data/2012-07-01//*
2. On hive, create table like below:
CREATE TABLE user_logs(id INT, created_at STRING)
row format delimited fields terminated by ',' lines terminated by '\n'
stored as inputformat 'org.apache.hadoop.hive.ql.io.SymlinkTextInputFormat'
outputformat 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat';
3. Put link.txt to /user/hive/warehouse/user_logs
$ sudo -u hdfs hadoop fs -put link.txt /user/hive/warehouse/user_logs
4. Open another session(A session), and watch socket,
$ netstat -a | grep CLOSE_WAIT
tcp 1 0 localhost:48121 localhost:50010
CLOSE_WAIT
tcp 1 0 localhost:48124 localhost:50010
CLOSE_WAIT
$
5. Return to hive session, execute this,
$ select * from user_logs;
6. Return to A session, watch socket again,
$ netstat -a | grep CLOSE_WAIT
tcp 1 0 localhost:48121 localhost:50010
CLOSE_WAIT
tcp 1 0 localhost:48124 localhost:50010
CLOSE_WAIT
tcp 1 0 localhost:48166 localhost:50010
CLOSE_WAIT
If you makes any partitions, you'll watch unclosed socket whose count
equals partitions by once.
I think that this problem maybe is caused by this point:
At
https://github.com/apache/hive/blob/trunk/ql/src/java/org/apache/hadoop/hive/ql/io/SymbolicInputFormat.java,
line 66. BufferedReader was opened, but it doesn't closed.
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