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BookKeeper
Flavio Junqueira
Yahoo! Research, Barcelona
Hadoop in China 2011
Hadoop in China - 2011
What’s BookKeeper?
•
Shared storage for writing fast sequences of
byte arrays
•
Data is replicated
•
Writes are striped
•
Many processes can access it
2
Hadoop in China - 2011
Motivation
•
Recoverable systems
✓
Journal/write-ahead log
✓
Integrity and durability
✓
Efficient: sequential synchronous writes
•
Why is writing sequentially important?
✓
To avoid random seeks
3
Hadoop in China - 2011
More motivation
•
Examples
✓
Many databases (e.g., Postgres)
✓
Hbase region server
✓
ZooKeeper
✓
HDFS namenode
✓
Hedwig hubs
4
Hadoop in China - 2011
HDFS at a glance
•
Main components: namenode and datanode
✓
Single name node
✓
A number of data nodes
•
Namenode
✓
Manages FS namespace
✓
Regulates access to the FS
✓
Mapping of blocks to data nodes
•
Datanode
✓
Stores blocks
✓
Serves reads and writes
5
http://hadoop.apache.org/common/docs/current/hdfs_design.html
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