发布于 2016-11-10 23:55:12 | 93 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 0.57.1 发布了，
部分更新如下：
Fixed NPE in the ``percentile`` aggregation fucntion. The NPE was occurring in case when queried shards have no records.
Fixed an issue with select queries returning duplicate outputs when `where` uses `=` with `primary key` and an order by which is also part of the selected fields is used.
Fixed adding a column to an existing object array using `ALTER TABLE`
Fix: selecting os_info['jvm']['vm_vendor'] and os_info['jvm']['name'] caused ColumnUnknownExceptions
Removed reduced thread stack size java option, stack size defaults to JVM defaults now.
Fixed an issue that causes outer joins to fail with an exception if columns are referenced in a where clause but not as select items.
Updated crate-admin to ``0.21.2`` which includes the following change:
fixed incorrect sql query for creating the tweets table in the tutorial.
Fixed an issue that caused right outer joins to get stuck instead of returning a result if the left table is empty.
Updated crate-admin to ``0.21.1`` which includes the following changes:
Fix: Corrected the sql queries to display the table list in the Tables view, and to create the tweets table only if it does not exist.
Fixed an issue that caused left outer joins to return an empty result if the joined table is empty.
Fix: Certain subselects with nested ``order by`` and ``limit`` or ``offset`` produced incorrect results.
eg. select * from (select a, b from t1 order by a limit 3) as t order by b limit 2
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