发布于 2016-05-31 00:29:17 | 145 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 0.55.0 发布。主要更新内容如下：
- BREAKING: Units are now required for time or byte based settings in the
`crate.yml` configuration file. Nodes won't start otherwise.
- BREAKING: The `gateway.local.sync` setting has been renamed to
`translog.sync_interval`.
- BREAKING: It is no longer possible to specify the location of the config
file with the `CONF_FILE` environment variable, or the `-Des.config`,
`-Des.default.config`, or `-Delasticsearch.config` parameters.
The config file must now be named `crate.yml` and must be located in the
default `config/` directory, in the directory specified in the `CONF_DIR`
environmental variable, or the one specified in the `-Des.path.home`
parameter.
- BREAKING: Crate will die now on all plugin loading errors.
- BREAKING: Column names may not contain the `.` character anymore.
- BREAKING: Tables are not refreshed automatically anymore before and after
a `DELETE-BY-QUERY` operation is applied.
- Upgraded Elasticsearch to 2.3.3
- Updated crate-admin to 0.18.0 which contains following changes:
- Cluster check include now clickable links
- Load additional links in menu dynamically from news feed
- Fixed an issue which caused rendering errors in the node list if the cluster
contains multiple nodes with the same name
note: changes the url to the detail view of single nodes
- Added UTM tokens to links that link to the Crate.IO blog
- Updated news feed URL
- Label the master node in the cluster node list
- Fixed a bug which prevented complete deletion of tables in custom
schemas.
- Improved the `KILL` behaviour for `COPY`, `UPDATE` and `DELETE` statements.
- Fixed a `ClassCastException` that occurred if the left side of a `IN`
predicate was a function.
- Added links to Cluster check documentation.
- Removed the `creationTime` property from `SQL(Bulk)Request` and changed the
`duration` property on `SQL(Bulk)Response` to return the server-side
duration instead of the full round-trip duration.
- The default number of shards is calculated dynamically upon the table
creation.
- Deprecated camelCase names on `CREATE ANALYZER`.
- `+HeapDumpOnOutOfMemoryError` is no longer set by default.
It can still be set using the JAVA_OPTS environment variable.
- Made sure orphaned contexts are cleaned up eventually after a coordinator
node dies.
- Load ``crate.yml`` explicitly and do not allow any other extension than
``yml`` for the configuration file.
- Restrict creation of tables having the primary key constraint within
an array column type or its children.
- Renamed all scalar function names to lowercase (CamelCase names
were transformed to lowercase using `_` as word boundary)
- Fixed a NPE at the `substr` scalar function when using column
references as from/to arguments containing null values.
- NOTE: Upgrading to this Crate version is only supported from >= 0.52
- Removed the `bulk.partition_creation_timeout` setting.
- Removed internal migration code that ensured schema backward compatibility
to Crate versions <= 0.45
- Improved the speed of global aggregation queries which involve more than 1
shard per node.
- The log level of loggers can now be set at runtime via the ``SET`` statement.
- Improved validation of geo point data type; now it is not possible any more
to insert invalid latitude or longitude in array literals.
- Nodes can be configured now to allow only SQL statements resulting in read operations using new setting ``node.sql.read_only``.
- Improved bulk insert/update and copy-from performance when replicas
are configured.
- Fixed planner issues that could cause INSERT INTO with a JOIN in the
sub-query to fail or get stuck.
- Removed the ``jobs.keep_alive_timeout`` setting and all related logic.
This means it is no longer possible to enable automatic job termination.
- Added a ``node_filters`` option to ``COPY FROM``.
- Add support for ``COPY FROM`` to ``EXPLAIN``.
- The ``COPY FROM`` statement now also accepts an array of strings as URI.
- Added support for schemes supported by the used JVM's `URL` implementation
for ``COPY FROM``. These usually include``http``, ``https``, ``ftp`` and
``jar``.
- Added support for the ``unnest`` table function.
- Implemented cluster check for installed java version.
- removed wrong behaving CrateClient feature which allowed to load
client settings from a configuration file.
- Crate will now recognize settings defined by crate plugins.
- Implemented the EXPLAIN command for SELECT statements.
- Removed the limitation that the WHERE clause couldn't contain
certain expressions in `DELETE` statements
- Exposed setting the default schema via HTTP header.
- Added `lower`` and `upper`` string functions.
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