A database shard is a horizontal partition in a database or search engine. Each individual partition is referred to as a shard or database shard.
Posts about Sharded
  • How Facebook Audience Insights Are Real-Time

    … in the system. Data is sharded by user, and there are total of 1,024 shards distributed to 168 data nodes in one production cluster. For each shard, 35 gigabytes of raw data are copied to a data node to build the shard, which takes 8 GB in memory and 4 GB in embedded storage on flash disk. The total amount of data copied to one cluster is more than 35…

    David Cohen/ AllFacebookin Social Facebook How To's- 10 readers -
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