gowa commented on code in PR #4166:
URL: https://github.com/apache/cassandra/pull/4166#discussion_r2116277633
##########
conf/cassandra-env.sh:
##########
@@ -199,6 +199,45 @@ if [ "x$CASSANDRA_HEAPDUMP_DIR" = "x" ]; then
fi
JVM_OPTS="$JVM_OPTS -XX:HeapDumpPath=$CASSANDRA_HEAPDUMP_DIR/cassandra-`date
+%s`-pid$$.hprof"
+# by default, enable cassandra heapdump files clean up, keeping 2 latest files
+# and 1 oldest heap dump file (this may help identify the earliest OOM issue)
+if [ "x$CASSANDRA_HEAPDUMP_CLEAN" = "x" ]; then
Review Comment:
this is done following the pattern I've seen above:
```
if [ "x$CASSANDRA_HEAPDUMP_DIR" = "x" ]; then
CASSANDRA_HEAPDUMP_DIR="$CASSANDRA_LOG_DIR"
fi
```
I read it as: assign some default unless overridden by caller.
Therefore, I assumed that someone can override these env variables outside
of this env script.
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