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From "Benedict Jin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-2837) Add a special START_SERVER_JVMFLAGS option only for `start` command to distinguish JVMFLAGS and SERVER_JVMFLAGS
Date Wed, 05 Jul 2017 03:38:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benedict Jin updated ZOOKEEPER-2837:
------------------------------------
    Description: 
Add a special START_SERVER_JVMFLAGS option only for `start` command to distinguish JVMFLAGS
and SERVER_JVMFLAGS.

If we use the normal way to add JVM options with `JVMFLAGS` in `conf/java.env`, then it will
effect almost all shell scripts under `bin` directory. Even if using `SERVER_JVMFLAGS` will
effect some commands like `zkServer.sh status`, include four-letters commands.

For example, if the JVMFLAGS is 
```bash
export JVMFLAGS="-Xms3G -Xmx3G -Xmn1G -XX:+AlwaysPreTouch -XX:CMSInitiatingOccupancyFraction=70
-XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+PrintGCDetails -XX:-PrintGCTimeStamps -Xloggc:/home/zookeeper/logs/zookeeper_`date
'+%Y%m%d%H%M%S'`.gc -XX:-UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=64M"
```
then we will get too many GC log files due to using the `mntr` four-letters command regularly
 in some monitor situation.
```bash
$ ls ~/logs
zookeeper_20170704175942.gc
zookeeper_20170704180101.gc
zookeeper_20170704180201.gc
zookeeper_20170704180301.gc
zookeeper_20170704180401.gc
...
```

  was:
Add a special START_SERVER_JVMFLAGS option only for `start` command to distinguish JVMFLAGS
and SERVER_JVMFLAGS.

If we use the normal way to add JVM options with `JVMFLAGS` in `conf/java.env`, then it will
effect almost all shell scripts under `bin` directory. Even if using `SERVER_JVMFLAGS` will
effect some commands like `zkServer.sh status`, include four-letters commands.

For example, if the JVMFLAGS is 
```bash
export JVMFLAGS="-Xms3G -Xmx3G -Xmn1G -XX:+AlwaysPreTouch -XX:CMSInitiatingOccupancyFraction=70
-XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+PrintGCDetails -XX:-PrintGCTimeStamps -Xloggc:/home/zookeeper/logs/zookeeper_`date
'+%Y%m%d%H%M%S'`.gc -XX:-UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=64M"
```
then we will get too many GC log files due to using the `mntr` four-letters commands in some
monitor situation.


> Add a special START_SERVER_JVMFLAGS option only for `start` command to distinguish JVMFLAGS
and SERVER_JVMFLAGS
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2837
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2837
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.3
>            Reporter: Benedict Jin
>            Assignee: Benedict Jin
>   Original Estimate: 72h
>  Remaining Estimate: 72h
>
> Add a special START_SERVER_JVMFLAGS option only for `start` command to distinguish JVMFLAGS
and SERVER_JVMFLAGS.
> If we use the normal way to add JVM options with `JVMFLAGS` in `conf/java.env`, then
it will effect almost all shell scripts under `bin` directory. Even if using `SERVER_JVMFLAGS`
will effect some commands like `zkServer.sh status`, include four-letters commands.
> For example, if the JVMFLAGS is 
> ```bash
> export JVMFLAGS="-Xms3G -Xmx3G -Xmn1G -XX:+AlwaysPreTouch -XX:CMSInitiatingOccupancyFraction=70
-XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+PrintGCDetails -XX:-PrintGCTimeStamps -Xloggc:/home/zookeeper/logs/zookeeper_`date
'+%Y%m%d%H%M%S'`.gc -XX:-UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=64M"
> ```
> then we will get too many GC log files due to using the `mntr` four-letters command regularly
 in some monitor situation.
> ```bash
> $ ls ~/logs
> zookeeper_20170704175942.gc
> zookeeper_20170704180101.gc
> zookeeper_20170704180201.gc
> zookeeper_20170704180301.gc
> zookeeper_20170704180401.gc
> ...
> ```



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