hive： Error in acquiring locks

错误：

ERROR : FAILED: Error in acquiring locks: Locks on the underlying objects cannot be acquired. retry after some timeorg.apache.hadoop.hive.ql.lockmgr.LockException: Locks on the underlying objects cannot be acquired. retry after some time

解决办法： set hive.support.concurrency=false;

Hive中定义了两种锁的模式：共享锁（S）和排它锁（X），顾名思义，多个共享锁(S)可以同时获取，但是排它锁(X)会阻塞其它所有锁。

如果select一张表，这张表则会进入shared模式，增加、插入、删除、修改数据和修改表名等操作都会在shared锁被释放之后再执行，会一直等待。

如果插入、删除、修改数据则进入Exclusive锁模式，进入排他锁模式之后不允许增删改操作，会报错

ERROR : FAILED: Error in acquiring locks: Locks on the underlying objects cannot be acquired. retry after some time org.apache.hadoop.hive.ql.lockmgr.LockException: Locks on the underlying objects cannot be acquired. retry after some time

释放掉Exclusive锁模式即可操作。

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