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From "Jiaqi Tan (JIRA)" <>
Subject [jira] Created: (CHUKWA-94) SALSA state-machine extraction from Hadoop logs
Date Mon, 06 Apr 2009 14:17:13 GMT
SALSA state-machine extraction from Hadoop logs

                 Key: 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 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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