crate 0.49.4 发布，大规模数据存储系统

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　　crate 0.49.4 发布，更新内容如下：

• 　　- Fixed issue that could lead to deadlock and therefore freezing of a node when there where too many queries asking for routing information in parallel.
  
• 　　- Fix: Querying from information_schema while a table is created could cause an error
  
• 　　- only log amazon s3 client stuff on level ``WARN``
  
• 　　- log failing uri on COPY FROM
  
• 　　- Fixed a NPE that was thrown if a SELECT statement contained `_score` in the result columns and an ORDER BY clause.
  
• 　　- Fix: selecting error from sys.jobs_log caused a NPE in some cases
  
• 
  　　- Fix: If a query would fail because a shard starts to>
  
• 　　- Fix: load Crate plugins only once on node start
  
• 　　- Fixed an issue that caused `sys.shards` queries to omit unassigned shards if the query was made against a node that has `node.data` set to false
  
• 　　- Fix: Fixed a bug where some searchers were not properly closed
  
• 　　- Fixed a race condition that could cause `DROP TABLE IF EXISTS` to fail if the table was concurrently dropped.
  
• 　　- Fixed a race condition in `ALTER TABLE ` that could occur if a `DELETE FROM ` was invoked immediately before the `ALTER TABLE` statement.
  

　　更多内容请查看更新日志。
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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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