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https://issues.apache.org/jira/browse/DRILL-4581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15230658#comment-15230658
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Paul Rogers commented on DRILL-4581:
------------------------------------
Not a bug, but the drill-config.sh script sources the
$DRILL_CONF_DIR/drill-env.sh script without checking if it exists. Since this
file is optional, the script should skip sourcing the file if it does not exist.
> Various problems in the Drill startup scripts
> ---------------------------------------------
>
> Key: DRILL-4581
> URL: https://issues.apache.org/jira/browse/DRILL-4581
> Project: Apache Drill
> Issue Type: Bug
> Components: Server
> Affects Versions: 1.6.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Minor
>
> Noticed the following in drillbit.sh:
> 1) Comment: DRILL_LOG_DIR Where log files are stored. PWD by default.
> Code: DRILL_LOG_DIR=/var/log/drill or, if it does not exist, $DRILL_HOME/log
> 2) Comment: DRILL_PID_DIR The pid files are stored. /tmp by default.
> Code: DRILL_PID_DIR=$DRILL_HOME
> 3) Redundant checking of JAVA_HOME. drillbit.sh sources drill-config.sh which
> checks JAVA_HOME. Later, drillbit.sh checks it again. The second check is
> both unnecessary and prints a less informative message than the
> drill-config.sh check. Suggestion: Remove the JAVA_HOME check in drillbit.sh.
> 4) Though drill-config.sh carefully checks JAVA_HOME, it does not export the
> JAVA_HOME variable. Perhaps this is why drillbit.sh repeats the check?
> Recommended: export JAVA_HOME from drill-config.sh.
> 5) Both drillbit.sh and the sourced drill-config.sh check DRILL_LOG_DIR and
> set the default value. Drill-config.sh defaults to /var/log/drill, or if that
> fails, to $DRILL_HOME/log. Drillbit.sh just sets /var/log/drill and does not
> handle the case where that directory is not writable. Suggested: remove the
> check in drillbit.sh.
> 6) Drill-config.sh checks the writability of the DRILL_LOG_DIR by touching
> sqlline.log, but does not delete that file, leaving a bogus, empty client log
> file on the drillbit server. Recommendation: use bash commands instead.
> 7) The implementation of the above check is a bit awkward. It has a fallback
> case with somewhat awkward logic. Clean this up.
> 8) drillbit.sh, but not drill-config.sh, attempts to create /var/log/drill if
> it does not exist. Recommended: decide on a single choice, implement it in
> drill-config.sh.
> 9) drill-config.sh checks if $DRILL_CONF_DIR is a directory. If not, defaults
> it to $DRILL_HOME/conf. This can lead to subtle errors. If I use
> drillbit.sh --config /misspelled/path
> where I mistype the path, I won't get an error, I get the default config,
> which may not at all be what I want to run. Recommendation: if the value of
> DRILL_CONF_DRILL is passed into the script (as a variable or via --config),
> then that directory must exist. Else, use the default.
> 10) drill-config.sh exports, but may not set, HADOOP_HOME. This may be left
> over from the original Hadoop script that the Drill script was based upon.
> Recomendation: export only in the case that HADOOP_HOME is set for cygwin.
> 11) Drill-config.sh checks JAVA_HOME and prints a big, bold error message to
> stderr if JAVA_HOME is not set. Then, it checks the Java version and prints a
> different message (to stdout) if the version is wrong. Recommendation: use
> the same format (and stderr) for both.
> 12) Similarly, other Java checks later in the script produce messages to
> stdout, not stderr.
> 13) Drill-config.sh searches $JAVA_HOME to find java/java.exe and verifies
> that it is executable. The script then throws away what we just found. Then,
> drill-bit.sh tries to recreate this information as:
> JAVA=$JAVA_HOME/bin/java
> This is wrong in two ways: 1) it ignores the actual java location and assumes
> it, and 2) it does not handle the java.exe case that drill-config.sh
> carefully worked out.
> Recommendation: export JAVA from drill-config.sh and remove the above line
> from drillbit.sh.
> 14) drillbit.sh presumably takes extra arguments like this:
> drillbit.sh -Dvar0=value0 --config /my/conf/dir start -Dvar1=value1
> -Dvar2=value2 -Dvar3=value3
> The -D bit allows the user to override config variables at the command line.
> But, the scripts don't use the values.
> A) drill-config.sh consumes --config /my/conf/dir after consuming the leading
> arguments:
> while [ $# -gt 1 ]; do
> if [ "--config" = "$1" ]; then
> shift
> confdir=$1
> shift
> DRILL_CONF_DIR=$confdir
> else
> # Presume we are at end of options and break
> break
> fi
> done
> B) drill-bit.sh will discard the var1:
> startStopStatus=$1 <-- grabs "start"
> shift
> command=drillbit
> shift <-- Consumes -Dvar1=value1
> C) Remaining values passed back into drillbit.sh:
> args=$@
> nohup $thiscmd internal_start $command $args
> D) Second invocation discards -Dvar2=value2 as described above.
> E) Remaining values are passed to runbit:
> "$DRILL_HOME"/bin/runbit $command "$@" start
> F) Where they again pass though drill-config. (Allowing us to do:
> drillbit.sh --config /first/conf --config /second/conf
> which is asking for trouble)
> G) And, the remaining arguments are simply not used:
> exec $JAVA -Dlog.path=$DRILLBIT_LOG_PATH
> -Dlog.query.path=$DRILLBIT_QUERY_LOG_PATH $DRILL_ALL_JAVA_OPTS -cp $CP
> org.apache.drill.exec.server.Drillbit
> 15) The checking of command-line args in drillbit.sh is wrong:
> # if no args specified, show usage
> if [ $# -lt 1 ]; then
> echo $usage
> exit 1
> fi
> ...
> . "$bin"/drill-config.sh
> But, note, that drill-config.sh handles:
> drillbit.sh --config /conf/dir
> Consuming those two arguments will leave no command argument. Thus, the
> no-argument check should be done AFTER consuming --config.
> 16) As noted above, both drillbit.sh and runbit source drill-config.sh. But
> runbit is (apparently) only every called from drillbit.sh. Therefore, we do
> the same setup & check tasks twice. (In addition to reading --config twice as
> noted above.) Recommendation: omit the sourcing of drill-config.sh in runbit.
> 17) The name of the drillbit.sh script is used in many messages. It is
> hardcoded, but appears to originally have been taken from $0:
> command=drillbit
> shift
> Recommended: get the name from the script, strip the directory, and strip the
> suffix. So, /foo/drillbit2.sh becomes drillbit2, \windir\drillbit2.bat
> becomes drillbit2.
> 18) drillbit.sh creates a pid file to record the pid of the running Drillbit.
> However, the file is not deleted upon normal Drill exit. Better would be to
> remove this file on exit to keep things tidy.
> 19) Similarly, when the stop command detects a pid file, but no running
> process with that pid, it prints a message saying so, but does not clean up
> the (unwanted) pid file. It should do so.
> 20) The runbit script sets up Java options as follows:
> DRILL_ALL_JAVA_OPTS="$DRILLBIT_JAVA_OPTS $DRILL_JAVA_OPTS $SERVER_GC_OPTS"
> Presumably the DRILL_JAVA_OPTS are for all Drill apps (including the client)
> while DRILLBIT_JAVA_OPTS are for the server (drillbit).
> Since later Java options override earlier ones, more specific options (for
> the server) should come after more general ones (for all of Drill). So, order
> should be:
> DRILL_ALL_JAVA_OPTS="$DRILL_JAVA_OPTS $DRILLBIT_JAVA_OPTS $SERVER_GC_OPTS"
> 21) The startup scripts go to great lengths to properly set up the logs. But,
> we allow drill-env.sh to override them.
> exec $JAVA -Dlog.path=$DRILLBIT_LOG_PATH
> -Dlog.query.path=$DRILLBIT_QUERY_LOG_PATH $DRILL_ALL_JAVA_OPTS ...
> The computed log properties come before the user-defined properties, and so
> user defined properties can override those log settings. The computed log
> settings are used to write log entries and should be considered "correct."
> Recommended: change option order as follows:
> exec $JAVA $DRILL_ALL_JAVA_OPTS -Dlog.path=$DRILLBIT_LOG_PATH
> -Dlog.query.path=$DRILLBIT_QUERY_LOG_PATH ...
> 22) As above, but in sqlline:
> exec "$JAVA" $DRILL_SHELL_JAVA_OPTS $DRILL_JAVA_OPTS
> Should be:
> exec "$JAVA" $DRILL_JAVA_OPTS $DRILL_SHELL_JAVA_OPTS
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