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萤火虫 | 有萤火之光足矣，何须等待火炬

Dremel: Google, VLDB’10, September 2010. 例如要查询Document.Name.Language.Code的时候就不希望访问任何Document.Name.Language.Country或者其他不相关的字段的存储。为了解决这个问题，Dremel为每个字段数据引入两个额外的数据 Repetition Level和Definition Level。 Required int64 DocId;. Required string Link;. Required string Code;. Optional string Country; }. Optional string Url;}. 例如在上述PB定义中，在读到Document.DocId这个列后，需要去读Document.Link这个列，但是如何决定下一步是去读Name中的字段还是开始读取一个新的Document呢这部分信息实际上在存储记录的时候就已经计算好了，并存储在每一个列的Repetition Level(简写为r)中。 Pregel: Google, SIGMOD’10, June 2010.

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萤火虫 | 有萤火之光足矣，何须等待火炬 | fireflies.me Reviews

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Dremel: Google, VLDB’10, September 2010. 例如要查询Document.Name.Language.Code的时候就不希望访问任何Document.Name.Language.Country或者其他不相关的字段的存储。为了解决这个问题，Dremel为每个字段数据引入两个额外的数据 Repetition Level和Definition Level。 Required int64 DocId;. Required string Link;. Required string Code;. Optional string Country; }. Optional string Url;}. 例如在上述PB定义中，在读到Document.DocId这个列后，需要去读Document.Link这个列，但是如何决定下一步是去读Name中的字段还是开始读取一个新的Document呢这部分信息实际上在存储记录的时候就已经计算好了，并存储在每一个列的Repetition Level(简写为r)中。 Pregel: Google, SIGMOD’10, June 2010.

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1 有萤火之光足矣，何须等待火炬

2 跳至内容

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4 dremel

5 发表回复

6 dremel是一个分布式的列式嵌套存储引擎，支持sql方式的聚合查询只读

7 message document{

8 optional group name{

9 repeated group language{

10 dremel为每个记录构造一个fsm来高效组装记录

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有萤火之光足矣，何须等待火炬,跳至内容,所有文章,dremel,发表回复,dremel是一个分布式的列式嵌套存储引擎，支持sql方式的聚合查询只读,message document{,optional group name{,repeated group language{,dremel为每个记录构造一个fsm来高效组装记录,dremel的是通过server tree的引擎来完成分布式的数据查询的,结果经过层层会聚，最终由rootserver返回给用户,本条目发布于,属于数据处理,列式存储,参考资料

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萤火虫 | 有萤火之光足矣，何须等待火炬 | fireflies.me Reviews

https://fireflies.me

Dremel: Google, VLDB’10, September 2010. 例如要查询Document.Name.Language.Code的时候就不希望访问任何Document.Name.Language.Country或者其他不相关的字段的存储。为了解决这个问题，Dremel为每个字段数据引入两个额外的数据 Repetition Level和Definition Level。 Required int64 DocId;. Required string Link;. Required string Code;. Optional string Country; }. Optional string Url;}. 例如在上述PB定义中，在读到Document.DocId这个列后，需要去读Document.Link这个列，但是如何决定下一步是去读Name中的字段还是开始读取一个新的Document呢这部分信息实际上在存储记录的时候就已经计算好了，并存储在每一个列的Repetition Level(简写为r)中。 Pregel: Google, SIGMOD’10, June 2010.

INTERNAL PAGES

fireflies.me

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中文支持 | 萤火虫

http://www.fireflies.me/tag/中文支持

例如大部分文件是以utf8,gbk,gb2312,gb18030保存的，这些编码一般是系统默认自带的。 Set fileencodings=ucs-bom,utf-8,cp936,big5,gb18030,euc-jp,euc-kr,latin1. 1]区域设置 http:/ zh.wikipedia.org/wiki/%E5%8C%BA%E5%9F%9F%E8%AE%BE%E7%BD%AE. 2]vim file encoding http:/ edyfox.codecarver.org/html/vim fileencodings detection.html. 3]字符集和字符集编码http:/ www.cnblogs.com/skynet/archive/2011/05/03/2035105.html. 4]vim对中文编码的支持 http:/ blog.163.com/yysfire@126/blog/static/1831747201181845325813/. PowerLyra: SJTU, EuroSys’15. PowerGraph: CMU, OSDI’12.

2

数据处理 | 萤火虫

http://www.fireflies.me/category/数据处理

PowerLyra: SJTU, EuroSys’15. 1] Chen, R., Shi, J., Chen, Y., & Chen, H. (2015, April). Powerlyra: Differentiated graph computation and partitioning on skewed graphs. InProceedings of the Tenth European Conference on Computer Systems (p. 1). ACM. PowerGraph: CMU, OSDI’12. 1] Gonzalez J E, Low Y, Gu H, et al. PowerGraph: Distributed Graph-Parallel Computation on Natural Graphs[C]/ OSDI. 2012, 12(1): 2. Dremel: Google, VLDB’10, September 2010. Required int64 DocId;. Required string Link;.

3

繁体中文 | 萤火虫

http://www.fireflies.me/tag/繁体中文

例如大部分文件是以utf8,gbk,gb2312,gb18030保存的，这些编码一般是系统默认自带的。 Set fileencodings=ucs-bom,utf-8,cp936,big5,gb18030,euc-jp,euc-kr,latin1. 1]区域设置 http:/ zh.wikipedia.org/wiki/%E5%8C%BA%E5%9F%9F%E8%AE%BE%E7%BD%AE. 2]vim file encoding http:/ edyfox.codecarver.org/html/vim fileencodings detection.html. 3]字符集和字符集编码http:/ www.cnblogs.com/skynet/archive/2011/05/03/2035105.html. 4]vim对中文编码的支持 http:/ blog.163.com/yysfire@126/blog/static/1831747201181845325813/. PowerLyra: SJTU, EuroSys’15. PowerGraph: CMU, OSDI’12.

4

vim | 萤火虫

http://www.fireflies.me/tag/vim

例如大部分文件是以utf8,gbk,gb2312,gb18030保存的，这些编码一般是系统默认自带的。 Set fileencodings=ucs-bom,utf-8,cp936,big5,gb18030,euc-jp,euc-kr,latin1. 1]区域设置 http:/ zh.wikipedia.org/wiki/%E5%8C%BA%E5%9F%9F%E8%AE%BE%E7%BD%AE. 2]vim file encoding http:/ edyfox.codecarver.org/html/vim fileencodings detection.html. 3]字符集和字符集编码http:/ www.cnblogs.com/skynet/archive/2011/05/03/2035105.html. 4]vim对中文编码的支持 http:/ blog.163.com/yysfire@126/blog/static/1831747201181845325813/. PowerLyra: SJTU, EuroSys’15. PowerGraph: CMU, OSDI’12.

5

数据存储 | 萤火虫

http://www.fireflies.me/category/数据存储

Ceph认为将所有的管理工作全部交一个节点不利于整个系统的扩展 1 单个节点存储、计算以及网络传输能力有限，容易成为性能瓶颈 2 中心节点本身存在单点故障的风险。 Ceph将这种拥有部分自主管理能力的数据节点称为智能设备-OSD Object Storage Device。 Ceph采用一种更粗粒度的数据分布设计，数据 Object 首先会被映射到一个PG Placement Group ，各个PG被指派到不同的OSDs中同一个PG中的全部对象都被存储在同样的物理OSDs中。 Monitor集群不会主动去检测OSD的状态，OSD也不会定期向Monitor汇报状态，OSD状态报告主要是通过下面三种方式 1 Client在读取某个OSD内容时发现OSD宕机，并报告给Monitor集群 2 OSD在给其他OSD同步数据或者交换心跳信息时发现OSD宕机，报告给Monitor集群 3 新上线或者恢复的OSD主动向Monitor集群报道自己新的状态。该OSD收到写请求的时候先检查比对Client的自己的epoch，如果一致则查找pg id对应的active OSD list，并将副本信息转发给对应的OSD。

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Dremel: Google, VLDB’10, September 2010. 例如要查询Document.Name.Language.Code的时候就不希望访问任何Document.Name.Language.Country或者其他不相关的字段的存储。为了解决这个问题，Dremel为每个字段数据引入两个额外的数据 Repetition Level和Definition Level。 Required int64 DocId;. Required string Link;. Required string Code;. Optional string Country; }. Optional string Url;}. 例如在上述PB定义中，在读到Document.DocId这个列后，需要去读Document.Link这个列，但是如何决定下一步是去读Name中的字段还是开始读取一个新的Document呢这部分信息实际上在存储记录的时候就已经计算好了，并存储在每一个列的Repetition Level(简写为r)中。 Pregel: Google, SIGMOD’10, June 2010.

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