[jira] [Created] (KAFKA-1403) Adding timestamp to kafka index structure

["Xinyao Hu (JIRA)" <ji...@apache.org>]

Xinyao Hu created KAFKA-1403:
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             Summary: Adding timestamp to kafka index structure
                 Key: KAFKA-1403
                 URL: https://issues.apache.org/jira/browse/KAFKA-1403
             Project: Kafka
          Issue Type: Improvement
          Components: core
    Affects Versions: 0.8.1
            Reporter: Xinyao Hu


Right now, kafka doesn't have timestamp per message. It makes an assumption that all the messages in the same file has the same timestamp which is the mtime of the file. This makes it inefficient to scan all the messages within a time window, which is a valid use case in a lot of realtime data analysis. 

My guess this is not implemented due to the efficiency reason. It will cost additional four bytes per message which might be pinned in memory for fast access. There might be some simple perf optimization, such as differential encoding + var length encoding, which should bring down the cost to 1-2 bytes avg per message. 

Let me know if this makes sense. 



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