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https://issues.apache.org/jira/browse/HIVE-3335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428987#comment-13428987
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Ashutosh Chauhan commented on HIVE-3335:
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[~showyou] Your analysis seems correct. Mind submitting a patch for it?
> 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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