Cassandra - uk.sky.cqlmigrate.exception.CannotAcquireLockException: Lock currently in use

java.util.concurrent.TimeoutException: Timed out after waiting 3034 ms, with timeout 3000 ms
        at uk.sky.cqlmigrate.RetryTask.untilSuccess(RetryTask.java:28)
        at uk.sky.cqlmigrate.Lock.lock(Lock.java:47)
        at uk.sky.cqlmigrate.CqlMigratorImpl.migrate(CqlMigratorImpl.java:77)
        at com.xxx.xxx.cassandra.Main.main(Main.java:145)
#[051219 03:08:26,155 | xxxxx-19.0.0-20190813042221-f5zrl | ERROR | main | Main | Exception: {}]#
uk.sky.cqlmigrate.exception.CannotAcquireLockException: Lock currently in use
        at uk.sky.cqlmigrate.Lock.lock(Lock.java:50)
        at uk.sky.cqlmigrate.CqlMigratorImpl.migrate(CqlMigratorImpl.java:77)
        at com.xxx.xxx.cassandra.Main.main(Main.java:145)
Caused by: java.util.concurrent.TimeoutException: Timed out after waiting 3034 ms, with timeout 3000 ms
        at uk.sky.cqlmigrate.RetryTask.untilSuccess(RetryTask.java:28)
        at uk.sky.cqlmigrate.Lock.lock(Lock.java:47)
        ... 2 common frames omitted

网上搜咯了一圈，也没有解决我的问题，有说是 原因为：Spring 事务嵌套造成死锁。但是并不适合我这个问题；

后来跟同事一起排查发现，在Cassandra的keyspace中，多了一个叫做schema的表空间，导致脚本在执行的时候，冲突了从而将整个库锁了。。。手动删除这个多余的表空间，重新执行脚本就好了；

##删除表空间
DROP keyspace schema;
##创建表空间
CREATE KEYSPACE "devdb" WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '3'}  AND durable_writes = true;
##创建用户及密码
CREATE USER dev WITH PASSWORD 'dev123' SUPERUSER ;

微信公众号，搜索：zhangdaopin，也可方便快捷的看到本人的博客哦，谢谢~