SALSA state-machine extraction from Hadoop logs
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Key: CHUKWA-94
URL: https://issues.apache.org/jira/browse/CHUKWA-94
Project: Hadoop Chukwa
Issue Type: New Feature
Components: Data Processors
Reporter: Jiaqi Tan
This is a proposed feature addition to extract state-machine views from
Hadoop's logs (TaskTracker, JobTracker, and DataNode currently supported,
NameNode soon). These views are as described in
http://www.usenix.org/event/wasl08/tech/full_papers/tan/tan_html/ and will
enable analysis and diagnosis algorithms to be built on top of them.
Building a full SALSA view involves two steps:
1. Incrementally parsing log entries on a per-node basis to extract states
(line-by-line reading, assuming the entire log file from a given node is
available to the same process)
2. "Stitching" and correlating states across all logs (across nodes and across
types) to build a full state machine.
My idea is to add SALSA as two jobs in the demux stage, with the first parsing
job in demux, and either having:
(a) the parsing job write its output to the permanent store with the
correlating job reading/writing from/to the permanent store, or
(b) the parsing job write its output back to the sinkfile and having the
correlating job reading from the sink file and writing to the permanent store.
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