[Improvement] Add optional environment variables

[izchen]

What changes were proposed in this pull request?

Added six optional environment variables:

# RSS_HOME, RSS home directory (Default: parent directory of the script)
# RSS_CONF_DIR, RSS configuration directory (Default: ${RSS_HOME}/conf)
# HADOOP_CONF_DIR, Hadoop configuration directory (Default: ${HADOOP_HOME}/etc/hadoop)
# RSS_PID_DIR, Where the pid file is stored (Default: ${RSS_HOME})
# RSS_LOG_DIR, Where log files are stored (Default: ${RSS_HOME}/logs)
# RSS_IP, IP address Shuffle Server binds to on this node (Default: first non-loopback ipv4)

Why are the changes needed?

Simplify service deployment

Does this PR introduce any user-facing change?

Added six optional environment variables.

With the default environment variables, the behavior is the same as before this PR.

How was this patch tested?

local test

[codecov-commenter]

Codecov Report

Merging #187 (bf81a4b) into master (5864420) will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #187      +/-   ##
============================================
+ Coverage     58.37%   58.45%   +0.07%     
- Complexity     1270     1272       +2     
============================================
  Files           158      158              
  Lines          8428     8437       +9     
  Branches        782      782              
============================================
+ Hits           4920     4932      +12     
+ Misses         3255     3254       -1     
+ Partials        253      251       -2     

Impacted Files	Coverage Δ
.../apache/uniffle/coordinator/CoordinatorServer.java	64.89% <0.00%> (-0.70%)	⬇️
.../java/org/apache/uniffle/server/ShuffleServer.java	68.42% <0.00%> (-0.52%)	⬇️
.../org/apache/uniffle/common/config/RssBaseConf.java	93.42% <0.00%> (+0.27%)	⬆️
...org/apache/uniffle/server/ShuffleFlushManager.java	79.32% <0.00%> (+1.67%)	⬆️
...uniffle/common/security/HadoopSecurityContext.java	81.57% <0.00%> (+5.90%)	⬆️

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[colinmjj]

How about unify COORDINATOR_HOME and SHUFFLE_SERVER_HOME to RSS_HOME
All new environment variables can be defined in rss-env.sh

[izchen]

How about unify COORDINATOR_HOME and SHUFFLE_SERVER_HOME to RSS_HOME
All new environment variables can be defined in rss-env.sh

I think we can define RSS_HOME and RSS_CONF_DIR in rss-env.sh. I will modify the script later.

[izchen]

Unify style. In these scripts, rewrite set -e to set -o errexit.

set -e same as set -o errexit: https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html

[izchen]

How about unify COORDINATOR_HOME and SHUFFLE_SERVER_HOME to RSS_HOME
All new environment variables can be defined in rss-env.sh

Done.

Would you mind take a look when you have some time? @colinmjj

[colinmjj]

LGTM, +1, thanks for the contribution, @izchen

[jerqi]

LGTM +1, @izchen thanks

[izchen]

Thanks for your review, @colinmjj @jerqi !