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new 3539904 DRILL-8077: add troubleshooting information for IPv6
connections to HDFS Datanode in CLOSE_WAIT state
new 6b139c3 Merge pull request #21 from Z0ltrix/DRILL-8077
3539904 is described below
commit 353990460c147d89d65880ae03a771cee015117a
Author: Christian Pfarr <[email protected]>
AuthorDate: Tue Dec 21 20:59:06 2021 +0100
DRILL-8077: add troubleshooting information for IPv6 connections to HDFS
Datanode in CLOSE_WAIT state
---
_docs/en/110-troubleshooting.md | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/_docs/en/110-troubleshooting.md b/_docs/en/110-troubleshooting.md
index 88816f0..99db2f7 100644
--- a/_docs/en/110-troubleshooting.md
+++ b/_docs/en/110-troubleshooting.md
@@ -53,6 +53,7 @@ If you have any of the following problems, try the suggested
solution:
* [Queries Running Out of
Memory]({{site.baseurl}}/docs/troubleshooting/#queries-running-out-of-memory)
* [Unclear Error
Message]({{site.baseurl}}/docs/troubleshooting/#unclear-error-message)
* [Error Starting Drill in Embedded
Mode]({{site.baseurl}}/docs/troubleshooting/#error-starting-drill-in-embedded-mode)
+* [CLOSE_WAIT connections to HDFS
Datanode]({{site.baseurl}}/docs/troubleshooting/#close_wait-connections-to-hdfs-datanode)
### Memory Issues
Symptom: Memory problems occur when you run certain queries, such as those
with sort operators.
@@ -276,3 +277,15 @@ Symptom:
`java.net.BindException: Address already in use`
Solution: You can only run one Drillbit per node in embedded or distributed
mode using default settings. You need to either change ports used by Drillbit
or stop one Drillbit before starting another.
+
+### CLOSE_WAIT connections to HDFS Datanode
+
+Currently Hadoop does not support IPv6 client connections (See
[HADOOP-11890](https://issues.apache.org/jira/browse/HADOOP-11890)).
+
+If you run Drill within an IPv6 environment and see a lot of IPv6 connections
from Drillbit to HDFS Datanode in `CLOSE_WAIT` state, you can fix this by
preferring IPv4 over IPv6 via `drill-env.sh`
+
+```
+export DRILLBIT_JAVA_OPTS="$DRILLBIT_JAVA_OPTS -Djava.net.preferIPv4Stack=true
-Djava.net.preferIPv6Addresses=false"
+```
+
+This tells the Drillbit to use IPv4 connections to all Datasources, not only
to HDFS.
\ No newline at end of file
