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CFS: Cassandra backed storage for Hadoop
1.
CFS Cassandra-backed storage for
Hadoop Nick Bailey @nickmbailey nick@datastax.com
2.
©2012 DataStax Motivation 2
3.
©2012 DataStax Help me
Cassandra, you’re my only hope 3
4.
©2012 DataStax Cassandra • Distributed
architecture • No SPOF • Scalable • Real time data • No ad-hoc query support 4
5.
©2012 DataStax Cassandra, why
can’t you... 5
6.
©2012 DataStax ...do the
things Hadoop was built for. 6
7.
©2012 DataStax Cassandra +
Hadoop = <3 7
8.
©2012 DataStax The Solution •
InputFormat/OutputFormat • Unfortunately, still need a DFS • Run tasktrackers/datanodes locally • Data Locality FTW! • Run namenode/jobtracker somewhere • Since Cassandra 0.6 (the dark ages) 8
9.
©2012 DataStax Ok, but
what about these parts that suck... 9
10.
©2012 DataStax Do not
want... • Multiple hadoop stacks? • SPOF? • 3 JVMS? 10
11.
©2012 DataStax CFS 11
12.
©2012 DataStax Cassandra Data
model in 1 minute 12
13.
©2012 DataStax Column Families •
Column Family ~= Table • Row Key + columns • Columns are sparse 13
14.
©2012 DataStax Static -
Users Column Family 14 Row Key nickmbailey password: * name: Nick zznate password: * name: Nate phone: 512-7777
15.
©2012 DataStax Select *
from Users where name=Nick; Secondary Indexes 15
16.
©2012 DataStax Dynamic -
Friends 16 Row Key nickmbailey zznate: thobbs: zznate jbeiber: thobbs: steve_watt:
17.
©2012 DataStax So what
about CFS... 17
18.
©2012 DataStax Simple... 18
19.
©2012 DataStax 19
20.
©2012 DataStax CF: inode •
Essentially, namenode replacement • File metadata 20
21.
©2012 DataStax 21
22.
©2012 DataStax CF: inode •
Row Key = UUID • Allows for file renames • Secondary indexes for file browsing • Columns: 22 Column filename /home/nick/data.txt parent_path /home/nick/ attributes nick:nick:777 TimeUUID1 <block metadata> TimeUUID2 <block metadata> TimeUUID3 <block metadata> ...
23.
©2012 DataStax 23
24.
©2012 DataStax CF: sblocks •
Essentially, datanode replacement • Stores actual contents of files • Each row is an hdfs block • Row Key = Block ID 24 Column TimeUUID1 <compressed file data> TimeUUID2 <compressed file data> TimeUUID3 <compressed file data> ...
25.
©2012 DataStax 25
26.
©2012 DataStax Writes • Write
file metadata • Split into blocks • Still controlled by ‘dfs.block.size’ • also ‘cfs.local.subblock.size’ • Read in a block • split into sub blocks • Update inode, sblocks • rinse, repeat 26
27.
©2012 DataStax 27
28.
©2012 DataStax Reads • Check
for file in inode • Determine appropriate blocks • Request blocks via thrift • If data is local... • ...get location on local filesystem • If data is remote... • ...get actual file content via thrift 28
29.
©2012 DataStax What Else? •
Current Implementation: 1.0.4 • <property> <name>fs.cfs.impl</name> <value>com.datastax.bdp.hadoop.cfs.CassandraFileSystem</value> </property> • Supports HDFS append() • Immutability makes things easy • See the first incarnation • https://github.com/riptano/brisk 29
30.
Want a job? nick@datastax.com
31.
Questions?
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