如何提高zookeeper每个结点所能存储的数据大小
今天发现一个问题，zookeeper默认对每个结点的最大数据量有一个上限是1M，如果你要设置的配置数据大于这个上限将无法写法，在网上查了一圈发现有一个解决方案如下，增加-Djute.maxbuffer=10240000参数
最终提供一个完整的修改后的zkServer.sh文件如下
#!/bin/sh# Licensed to the Apache Software Foundation (ASF) under one or more# contributor license agreements. See the NOTICE file distributed with# this work for additional information regarding copyright ownership.# The ASF licenses this file to You under the Apache License, Version 2.0# (the "License"); you may not use this file except in compliance with# the License. You may obtain a copy of the License at## http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an "AS IS" BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License.## If this scripted is run out of /usr/bin or some other system bin directory# it should be linked to and not copied. Things like java jar files are found# relative to the canonical path of this script.## See the following page for extensive details on setting# up the JVM to accept JMX remote management:# http://java.sun.com/javase/6/docs/technotes/guides/management/agent.html# by default we allow local JMX connectionsZOO_USER_CFG="-Djute.maxbuffer=10240000"if [ "x$JMXLOCALONLY" = "x" ]then JMXLOCALONLY=falsefiif [ "x$JMXDISABLE" = "x" ]then echo "JMX enabled by default" >&2 # for some reason these two options are necessary on jdk6 on Ubuntu # accord to the docs they are not necessary, but otw jconsole cannot # do a local attach ZOOMAIN="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.local.only=$JMXLOCALONLY org.apache.zookeeper.server.quorum.QuorumPeerMain"else echo "JMX disabled by user request" >&2 ZOOMAIN="org.apache.zookeeper.server.quorum.QuorumPeerMain"fi# Only follow symlinks if readlink supports itif readlink -f "$0" > /dev/null 2>&1then ZOOBIN=`readlink -f "$0"`else ZOOBIN="$0"fiZOOBINDIR=`dirname "$ZOOBIN"`. "$ZOOBINDIR"/zkEnv.shif [ "x$SERVER_JVMFLAGS" ]then JVMFLAGS="$SERVER_JVMFLAGS $JVMFLAGS"fiif [ "x$2" != "x" ]then ZOOCFG="$ZOOCFGDIR/$2"fi# if we give a more complicated path to the config, don't screw around in $ZOOCFGDIRif [ "x`dirname $ZOOCFG`" != "x$ZOOCFGDIR" ]then ZOOCFG="$2" echo "Using config:$2" >&2fiif $cygwinthen ZOOCFG=`cygpath -wp "$ZOOCFG"` # cygwin has a "kill" in the shell itself, gets confused KILL=/bin/killelse KILL=killfiecho "Using config: $ZOOCFG" >&2if [ -z $ZOOPIDFILE ] then ZOOPIDFILE=$(grep dataDir "$ZOOCFG" | sed -e 's/.*=//')/zookeeper_server.pidfi_ZOO_DAEMON_OUT="$ZOO_LOG_DIR/zookeeper.out"case $1 instart) echo -n "Starting zookeeper ... " if [ -f $ZOOPIDFILE ]; then if kill -0 `cat $ZOOPIDFILE` > /dev/null 2>&1; then echo $command already running as process `cat $ZOOPIDFILE`. exit 0 fi fi nohup $JAVA "$ZOO_USER_CFG" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \ -cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" > "$_ZOO_DAEMON_OUT" 2>&1 < /dev/null & if [ $? -eq 0 ] then if /bin/echo -n $! > "$ZOOPIDFILE" then sleep 1 echo STARTED else echo FAILED TO WRITE PID exit 1 fi else echo SERVER DID NOT START exit 1 fi ;;start-foreground) ZOO_CMD="exec $JAVA" if [ "${ZOO_NOEXEC}" != "" ]; then ZOO_CMD="$JAVA" fi $ZOO_CMD "$ZOO_USER_CFG" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \ -cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" ;;print-cmd) echo "$JAVA -Dzookeeper.log.dir=\"${ZOO_LOG_DIR}\" -Dzookeeper.root.logger=\"${ZOO_LOG4J_PROP}\" -cp \"$CLASSPATH\" $JVMFLAGS $ZOOMAIN \"$ZOOCFG\" > \"$_ZOO_DAEMON_OUT\" 2>&1 < /dev/null" ;;stop) echo -n "Stopping zookeeper ... " if [ ! -f "$ZOOPIDFILE" ] then echo "no zookeeper to stop (could not find file $ZOOPIDFILE)" else $KILL -9 $(cat "$ZOOPIDFILE") rm "$ZOOPIDFILE" echo STOPPED fi ;;upgrade) shift echo "upgrading the servers to 3.*" $JAVA "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \ -cp "$CLASSPATH" $JVMFLAGS org.apache.zookeeper.server.upgrade.UpgradeMain ${@} echo "Upgrading ... " ;;restart) shift "$0" stop ${@} sleep 3 "$0" start ${@} ;;status) # -q is necessary on some versions of linux where nc returns too quickly, and no stat result is output STAT=`$JAVA "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \ -cp "$CLASSPATH" $JVMFLAGS org.apache.zookeeper.client.FourLetterWordMain localhost \ $(grep "^[[:space:]]*clientPort" "$ZOOCFG" | sed -e 's/.*=//') srvr 2> /dev/null \ | grep Mode` if [ "x$STAT" = "x" ] then echo "Error contacting service. It is probably not running." exit 1 else echo $STAT exit 0 fi ;;*) echo "Usage: $0 {start|start-foreground|stop|restart|status|upgrade|print-cmd}" >&2esac