crate 0.49.3/0.50.0 发布，大规模数据存储系统

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腾讯SNG夏日招聘集结号：200个空缺岗位，JAVA、C++、云计算、Android……
　　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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