发布于 2017-03-15 00:01:02 | 128 次阅读 | 评论: 0 | 来源: 网友投递
Crate.IO 大规模数据存储系统
Crate Data 是一个开源的大规模的可伸缩的数据存储系统，无需任何系统管理需求。提供强大的搜索功能。用于存储各种表格数据、非结构化数据和二进制对象。并可通过 SQL 进行检索。易于安装和使用，支持高可用性和实时大规模并行访问和处理。
Crate 1.0.5 版本发布了，
本次部分更新如下：
Fix: Case sensivity of aliases wasn't handled correctly.Aliases are now fully case sensitive.
BREAKING: The `ordinal` column at the `information_schema.columns` will return `NULL` now for all sub-columns (all non top-level columns) as the order of object columns is not guarateed.
Fixed a race condition that could have caused that not all columns were written to the metadata when a lot of new dynamic columns were generated concurrently.
Fixed an issue that caused joins on `information_schema.columns` to produce a wrong result if `information_schema.columns` was used as the right table.
Added cluster checks that warn if some tables need to be recreated or upgraded for compatibility with future versions of CrateDB.
Added functionality to monitor query runtime statistics via JMX.This feature can only be used with an enterprise license.
Added a new parameter ``upgrade_segments`` to the ``OPTIMIZE`` statement which enables the upgrade of tables and tables partitions to the current version of the storage engine.
Added new column ``min_lucene_version`` to ``sys.shards`` table, which shows the oldest lucene segment version used in the shard.
Remove restriction to run ``OPTIMIZE`` on blob tables.
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