zookeeper无法启动"Unable to load database on disk

QuorumPeerMain,ResourceManager都没有起来
resourcemanager.log如下

2018-09-28 23:17:02,787 FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error starting ResourceManager
org.apache.hadoop.service.ServiceStateException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
        at org.apache.hadoop.service.ServiceStateException.convert(ServiceStateException.java:59)
        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:172)
        at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
        at org.apache.hadoop.yarn.server.resourcemanager.AdminService.serviceInit(AdminService.java:142)
        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:267)
        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1185)
Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
        at org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef.waitForZKConnectionEvent(ActiveStandbyElector.java:1061)
        at org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef.access$400(ActiveStandbyElector.java:1032)
        at org.apache.hadoop.ha.ActiveStandbyElector.getNewZooKeeper(ActiveStandbyElector.java:636)
        at org.apache.hadoop.ha.ActiveStandbyElector.createConnection(ActiveStandbyElector.java:775)
        at org.apache.hadoop.ha.ActiveStandbyElector.<init>(ActiveStandbyElector.java:229)
        at org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService.serviceInit(EmbeddedElectorService.java:92)
        at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        ... 7 more

发现连接不上zookeeer,从xcall.sh jps中得知s103,s104的QuorumPeerMain没启动，去s103的~/zookeeper/zookeeper.out查看日志，发现

2018-09-29 03:40:56,375 [myid:103] - ERROR [main:QuorumPeer@692] - Unable to load database on disk
java.io.IOException: Found ^@^@^@ in /home/centos/zookeeper/version-2/acceptedEpoch
        at org.apache.zookeeper.server.quorum.QuorumPeer.readLongFromFile(QuorumPeer.java:1362)
        at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:677)
        at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:635)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)

dataDir=/home/centos/zookeeper //快照日志,在conf/zoo.cfg下,事务日志和快照日志位于相同目录
zookeeper.log.dir=. //log4j日志：记录zokeeper的健康状态,在conf/log4j.properties下
参考zookeeper日志配置

解决方法：zookeeper无法启动"Unable to load database on disk"