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Update doc on tmp dir (java.io.tmpdir) best practice (#9910) 

* Update doc on tmp dir best practice

* remove local recommendation
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Maytas Monsereenusorn 2020-05-26 06:37:01 -10:00 committed by GitHub
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docs/configuration/index.md
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@ -71,7 +71,7 @@ There are four JVM parameters that we set on all of our processes:
1. `-Duser.timezone=UTC` This sets the default timezone of the JVM to UTC. We always set this and do not test with other default timezones, so local timezones might work, but they also might uncover weird and interesting bugs. To issue queries in a non-UTC timezone, see [query granularities](../querying/granularities.html#period-granularities)
2. `-Dfile.encoding=UTF-8` This is similar to timezone, we test assuming UTF-8. Local encodings might work, but they also might result in weird and interesting bugs.
3. `-Djava.io.tmpdir=<a path>` Various parts of the system that interact with the file system do it via temporary files, and these files can get somewhat large. Many production systems are set up to have small (but fast) `/tmp` directories, which can be problematic with Druid so we recommend pointing the JVM’s tmp directory to something with a little more meat.
3. `-Djava.io.tmpdir=<a path>` Various parts of the system that interact with the file system do it via temporary files, and these files can get somewhat large. Many production systems are set up to have small (but fast) `/tmp` directories, which can be problematic with Druid so we recommend pointing the JVM’s tmp directory to something with a little more meat. This directory should not be volatile tmpfs. This directory should also have good read and write speed and hence NFS mount should strongly be avoided.
4. `-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager` This allows log4j2 to handle logs for non-log4j2 components (like jetty) which use standard java logging.
### Extensions

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docs/operations/basic-cluster-tuning.md
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@ -389,7 +389,7 @@ Enabling process termination on out-of-memory errors is useful as well, since th
```
-Duser.timezone=UTC
-Dfile.encoding=UTF-8
-Djava.io.tmpdir=<something other than /tmp which might be mounted to volatile tmpfs file system>
-Djava.io.tmpdir=<should not be volatile tmpfs and also has good read and write speed. Strongly recommended to avoid using NFS mount>
-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager
-Dorg.jboss.logging.provider=slf4j
-Dnet.spy.log.LoggerImpl=net.spy.memcached.compat.log.SLF4JLogger