THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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data/system/schema/mlog.bin (元数据日志)
http://iotdb.apache.org/SystemDesign/SchemaManager/SchemaManager.html#log-management-of-metadata
data/system/schema/system.properties (系统不可变参数)
partition_interval=9223372036854775807 timestamp_precision=ms tsfile_storage_fs=LOCAL enable_partition=false max_degree_of_index_node=256 tag_attribute_total_size=700 iotdb_version=UNKNOWN
data/system/schema/tlog.txt (标签、属性文件)
http://iotdb.apache.org/SystemDesign/SchemaManager/SchemaManager.html#tlog
data/system/storage_groups/{sg_name}/{vsg_id}/{partition}/Version-xxx (每个分区的版本控制文件,无内容)
data/system/storage_groups/upgrade/Version-xxx (升级过程的版本控制文件)
data/system/upgrade/upgrade.txt (升级日志文件)
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