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https://issues.apache.org/jira/browse/HBASE-17468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15825498#comment-15825498
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Ashish Singhi commented on HBASE-17468:
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We have been using that solution internally for around a year now.
bq. Would it work with 1.2.0?
Yes. We have back ported it to 1.0.2 version FYI
bq. but would it cause any side effects?
We didn't see any.
Note: HBASE-9393 patch will work only if your using one of the 2.8.0, 2.7.3,
2.6.5, 3.0.0-alpha1 Hadoop version.
> unread messages in TCP connections - possible connection leak
> -------------------------------------------------------------
>
> Key: HBASE-17468
> URL: https://issues.apache.org/jira/browse/HBASE-17468
> Project: HBase
> Issue Type: Bug
> Reporter: Shridhar Sahukar
> Priority: Critical
>
> We are running HBase 1.2.0-cdh5.7.1 (Cloudera distribution).
> On our Hadoop cluster, we are seeing that each HBase region server has large
> number of TCP connections to all the HDFS data nodes and all these
> connections have unread data in socket buffers. Some of these connections are
> also in CLOSE_WAIT or FIN_WAIT1 state while the rest are in ESTABLISHED state.
> Looks like HBase is creating some connections requesting data from HDFS, but
> its forgetting about those connections before it could read the data. Thus
> the connections are left lingering around with large data stuck in their
> receive buffers. Also, it seems HDFS closes these connections after a while,
> but since there is data in receive buffer the connection is left in
> CLOSE_WAIT/FIN_WAIT1 states.
> Below is a snapshot from one of the region servers:
> ## Total number of connections to HDFS (pid of region server is 143722)
> [bda@md-bdadev-42 hbase]$ sudo netstat -anp|grep 143722 | wc -l
> 827
> ## Connections that are not in ESTABLISHED state
> [bda@md-bdadev-42 hbase]$ sudo netstat -anp|grep 143722 | grep -v ESTABLISHED
> | wc -l
> 344
> ##Snapshot of some of these connections:
> tcp 133887 0 146.1.180.43:48533 146.1.180.40:50010
> ESTABLISHED 143722/java
> tcp 82934 0 146.1.180.43:59647 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 0 0 146.1.180.43:50761 146.1.180.27:2181
> ESTABLISHED 143722/java
> tcp 234084 0 146.1.180.43:58335 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 967667 0 146.1.180.43:56136 146.1.180.68:50010
> ESTABLISHED 143722/java
> tcp 156037 0 146.1.180.43:59659 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 212488 0 146.1.180.43:56810 146.1.180.48:50010
> ESTABLISHED 143722/java
> tcp 61871 0 146.1.180.43:53593 146.1.180.35:50010
> ESTABLISHED 143722/java
> tcp 121216 0 146.1.180.43:35324 146.1.180.38:50010
> ESTABLISHED 143722/java
> tcp 1 0 146.1.180.43:32982 146.1.180.42:50010
> CLOSE_WAIT 143722/java
> tcp 82934 0 146.1.180.43:42359 146.1.180.54:50010
> ESTABLISHED 143722/java
> tcp 159422 0 146.1.180.43:59731 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 134573 0 146.1.180.43:60210 146.1.180.76:50010
> ESTABLISHED 143722/java
> tcp 82934 0 146.1.180.43:59713 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 135765 0 146.1.180.43:44412 146.1.180.29:50010
> ESTABLISHED 143722/java
> tcp 161655 0 146.1.180.43:43117 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 75990 0 146.1.180.43:59729 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 78583 0 146.1.180.43:59971 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 1 0 146.1.180.43:39893 146.1.180.67:50010
> CLOSE_WAIT 143722/java
> tcp 1 0 146.1.180.43:38834 146.1.180.47:50010
> CLOSE_WAIT 143722/java
> tcp 1 0 146.1.180.43:40707 146.1.180.50:50010
> CLOSE_WAIT 143722/java
> tcp 106102 0 146.1.180.43:48208 146.1.180.75:50010
> ESTABLISHED 143722/java
> tcp 332013 0 146.1.180.43:34795 146.1.180.37:50010
> ESTABLISHED 143722/java
> tcp 1 0 146.1.180.43:57644 146.1.180.67:50010
> CLOSE_WAIT 143722/java
> tcp 79119 0 146.1.180.43:54438 146.1.180.70:50010
> ESTABLISHED 143722/java
> tcp 77438 0 146.1.180.43:35259 146.1.180.38:50010
> ESTABLISHED 143722/java
> tcp 1 0 146.1.180.43:57579 146.1.180.41:50010
> CLOSE_WAIT 143722/java
> tcp 318091 0 146.1.180.43:60124 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 1 0 146.1.180.43:51715 146.1.180.70:50010
> CLOSE_WAIT 143722/java
> tcp 126519 0 146.1.180.43:36389 146.1.180.49:50010
> ESTABLISHED 143722/java
> tcp 1 0 146.1.180.43:45656 146.1.180.75:50010
> CLOSE_WAIT 143722/java
> tcp 113720 0 146.1.180.43:59741 146.1.180.42:50010
> ESTABLISHED 143722/java
> tcp 74599 0 146.1.180.43:44192 146.1.180.60:50010
> ESTABLISHED 143722/java
> tcp 131224 0 146.1.180.43:53708 146.1.180.44:50010
> ESTABLISHED 143722/java
> tcp 1433915 0 146.1.180.43:57140 146.1.180.67:50010
> ESTABLISHED 143722/java
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