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https://issues.apache.org/jira/browse/DRILL-8077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17460201#comment-17460201
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ASF GitHub Bot commented on DRILL-8077:
---------------------------------------
vvysotskyi commented on a change in pull request #2406:
URL: https://github.com/apache/drill/pull/2406#discussion_r769956594
##########
File path: distribution/src/main/resources/drill-config.sh
##########
@@ -213,6 +213,9 @@ fi
# Set Drill-provided defaults here. Do not put Drill defaults
# in the distribution or user environment config files.
+# Prefer IPv4 over IPv6
+export DRILL_JAVA_OPTS=${$DRILL_JAVA_OPTS:-" -Djava.net.preferIPv4Stack=true
-Djava.net.preferIPv6Addresses=false"}
Review comment:
Please use the `DRILLBIT_OPTS` variable below instead of
`DRILL_JAVA_OPTS` and move it to the part where some other specific properties
are set, like `ReservedCodeCacheSize` and so on.
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> Thousand of CLOSE_WAIT connections to HDFS Datanode
> ----------------------------------------------------
>
> Key: DRILL-8077
> URL: https://issues.apache.org/jira/browse/DRILL-8077
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - Other
> Affects Versions: 1.16.0
> Reporter: Christian Pfarr
> Priority: Major
>
> In IPv6 environments after a while drill has a lot of connections to HDFS
> Datanode in CLOSE_WAIT state.
> To fix this we add '-Djava.net.preferIPv4Stack=true
> -Djava.net.preferIPv6Addresses=false' to our drill configuration and the
> problem vanished.
> we saw
> [https://community.cloudera.com/t5/Support-Questions/Over-40000-CLOSE-WAIT-after-hbase-cluster-restart/m-p/6403/highlight/true#M51847]
> from cloudera that helped.
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