1、设置普通亦或简单查询 不走mr hive.fetch.task.conversion=more
2、hive经常出现 变成存在安全隐患与变成良好之间切换 可以借鉴cdh mysql推荐配置
[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock transaction-isolation = READ-COMMITTED # Disabling symbolic-links is recommended to prevent assorted security risks; # to do so, uncomment this line: symbolic-links = 0 key_buffer_size = 32M max_allowed_packet = 32M thread_stack = 256K thread_cache_size = 64 query_cache_limit = 8M query_cache_size = 64M query_cache_type = 1 max_connections = 550 #expire_logs_days = 10 #max_binlog_size = 100M #log_bin should be on a disk with enough free space. #Replace '/var/lib/mysql/mysql_binary_log' with an appropriate path for your #system and chown the specified folder to the mysql user. log_bin=/var/lib/mysql/mysql_binary_log #In later versions of MySQL, if you enable the binary log and do not set #a server_id, MySQL will not start. The server_id must be unique within #the replicating group. server_id=1 binlog_format = mixed read_buffer_size = 2M read_rnd_buffer_size = 16M sort_buffer_size = 8M join_buffer_size = 8M # InnoDB settings innodb_file_per_table = 1 innodb_flush_log_at_trx_commit = 2 innodb_log_buffer_size = 64M innodb_buffer_pool_size = 4G innodb_thread_concurrency = 8 innodb_flush_method = O_DIRECT innodb_log_file_size = 512M [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid sql_mode=STRICT_ALL_TABLES