新闻 crate 0.49.3/0.50.0 发布，大规模数据存储系统 下载

crate 0.49.3/0.50.0 发布，其中 0.49.3 的更新内容如下：

• 
  - Fixed an issue where ``_raw`` and ``_doc`` in primary key queries
  returned ``NULL``
  
  
• 
  - Updated crash to 0.13.0 which includes following changes:
  - Added `dynamic` as output format option
  - Added ``--version`` to cli interface to show crash version and exit
  - Display command help in case the command is not used correctly
  - Display NULL values in mixed mode correctly
  - Fixed broken 'mixed' output style due to overriding import
  - Improved readability of sql syntax highlighting
  - Attempting to use unknown command now results in an error
  
  
• 
  - Fix: return correct status for ``GET`` requests on ``/`` REST endpoint
  when cluster is starting up
  
  
• 
  - Fixed a race condition that could cause a `CREATE TABLE` statement
  immediately after a `DROP TABLE` statement to fail.
  
  
• 
  - Fixed a minor memory leak that occurred if custom schemas were deleted.
  
  
• 
  - Fixed incorrect comparison in query by IP type
  
  
• 
  - Fix: make sure sys.nodes expressions that utilize os/process/network/jvm
  services use the same stats probe per row; previously values derived from
  these services could have been from different probes
  

0.50.0 的更新内容如下：

• 
  NOTE: Upgrading from 0.49 or earlier versions requires a full cluster restart
  
  
• 
  - Updated crate-admin to 0.13.2 which includes following changes:
  - improved layout for smaller screens
  - improved load graph on overview page
  - display load, cpu usage, disk i/o, process stats and shard information
  on node detail page
  - added columns with partition values on "Partitions" table
  on table detail view
  
  
• 
  - Added ``probe_timestamp`` child expressions for os, process, heap, mem, and
  network columns to sys.nodes table
  
  
• 
  - Added ``process['cpu']`` column to sys.nodes table
  
  
• 
  - Added ``ALTER TABLE ONLY`` statement support.
  
  
• 
  - Added unicast host discovery via SRV DNS records
  
  
• 
  - Added the ``KILL ALL`` statement which can be used to cancel running
  operations
  
  
• 
  - Added new table settings that can be set on ``CREATE TABLE``
  and changed/reset with ``ALTER TABLE``.
  
  
• 
  - Added the ``concat`` scalar function and the concat operator ``||``.
  
  
• 
  - Updated Elasticsearch to 1.5.2
  
  
• 
  - Added the ``IF NOT EXISTS`` clause to the ``CREATE TABLE`` statement
  

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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。

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crate 0.49.3/0.50.0 发布，大规模数据存储系统下载地址