[ISSUE-6131]: Ensure JVM memory and GC options are set for bookie (ap…

…ache#6201)

### Motivation
Fixes apache#6131 (caused by apache#5675):

When upgrading an existing 2.4.1 bookie cluster to 2.5.0 on kubernetes, the bookie fails to start with the following exception during initialization: io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216 byte(s) of direct memory (used: 2147483648, max: 2147483648). This is caused by the fact that the bookie environment variables `BOOKIE_MEM` and `BOOKIE_FC` defined in conf/bkenv.sh has no effect, and it is always using the defaults values. 

#### Proposed solution:
Set `BOOKIE_MEM` and `BOOKIE_GC` in the helm deployments charts and default to `PULSAR_MEM` if the `BOOKIE` settings are not set and then use the default settings if none of those environment variables are set.

#### Changes made
Helm chart deployment `values.yaml` and `values-mini.yaml` along with the `bkenv.sh` configuration script.

### Documentation
Currently, the documentation explaining the deployment process and how to change settings is lacking and need to be updated.

conf/bkenv.sh

@@ -33,7 +33,7 @@ BOOKIE_CONF=${BOOKIE_CONF:-"$BK_HOME/conf/bookkeeper.conf"}
 # BOOKIE_LOG_DIR=
 
 # Memory size options
-BOOKIE_MEM=${BOOKIE_MEM:-"-Xms2g -Xmx2g -XX:MaxDirectMemorySize=2g"}
+BOOKIE_MEM=${BOOKIE_MEM:-${PULSAR_MEM:-"-Xms2g -Xmx2g -XX:MaxDirectMemorySize=2g"}}
 
 # Garbage collection options
 BOOKIE_GC=${BOOKIE_GC:-"-XX:+UseG1GC -XX:MaxGCPauseMillis=10 -XX:+ParallelRefProcEnabled -XX:+UnlockExperimentalVMOptions -XX:+AggressiveOpts -XX:+DoEscapeAnalysis -XX:ParallelGCThreads=32 -XX:ConcGCThreads=32 -XX:G1NewSizePercent=50 -XX:+DisableExplicitGC -XX:-ResizePLAB"}

deployment/kubernetes/helm/pulsar/templates/bookkeeper-statefulset.yaml

@@ -115,6 +115,7 @@ spec:
         - >
           bin/apply-config-from-env.py conf/bookkeeper.conf &&
           bin/apply-config-from-env.py conf/pulsar_env.sh &&
+          bin/apply-config-from-env.py conf/bkenv.sh &&
           bin/pulsar bookie
         ports:
         - name: client

deployment/kubernetes/helm/pulsar/values.yaml

@@ -179,7 +179,8 @@ bookkeeper:
   ## templates/bookkeeper-configmap.yaml
   ##
   configData:
-    PULSAR_MEM: "\"-Xms15g -Xmx15g -XX:MaxDirectMemorySize=15g -Dio.netty.leakDetectionLevel=disabled -Dio.netty.recycler.linkCapacity=1024 -XX:+UseG1GC -XX:MaxGCPauseMillis=10 -XX:+ParallelRefProcEnabled -XX:+UnlockExperimentalVMOptions -XX:+AggressiveOpts -XX:+DoEscapeAnalysis -XX:ParallelGCThreads=32 -XX:ConcGCThreads=32 -XX:G1NewSizePercent=50 -XX:+DisableExplicitGC -XX:-ResizePLAB -XX:+ExitOnOutOfMemoryError -XX:+PerfDisableSharedMem -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintHeapAtGC -verbosegc -XX:G1LogLevel=finest\""
+    BOOKIE_MEM: "\"-Xms15g -Xmx15g -XX:MaxDirectMemorySize=15g -Dio.netty.leakDetectionLevel=disabled -Dio.netty.recycler.linkCapacity=1024 -XX:+ParallelRefProcEnabled -XX:+UnlockExperimentalVMOptions -XX:+AggressiveOpts -XX:+DoEscapeAnalysis -XX:ParallelGCThreads=32 -XX:ConcGCThreads=32 -XX:G1NewSizePercent=50 -XX:+DisableExplicitGC -XX:-ResizePLAB -XX:+ExitOnOutOfMemoryError -XX:+PerfDisableSharedMem -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintHeapAtGC -verbosegc -XX:G1LogLevel=finest\""
+    BOOKIE_GC: "\"-XX:+UseG1GC -XX:MaxGCPauseMillis=10\""
     PULSAR_PREFIX_dbStorage_writeCacheMaxSizeMb: "2048"
     PULSAR_PREFIX_dbStorage_readAheadCacheMaxSizeMb: "2048"
     PULSAR_PREFIX_dbStorage_rocksDB_blockCacheSize: "268435456"