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Distributed computing system such as [MapReduce]\[1\], and Dryad\[2\] provide fault tolerance feature to help the system survive over the process crash. It is particular useful when computation requires to finish its execution in long time. Hama, based on the BSP\[3\] model, is a framework for massive scientific computations, which also requires this feature so that developers and users who exploit this framework can benefit from it. This page serves for providing information on direction how Hama [GroomServer] fault tolerance would work. |
Literature Review
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In general, a system designed to deal with failures usually need to apply techniques including unit of mitigation, redundancy, fault detection, fault recovery\[4\], and so on. |
Unit of mitigation: GroomServer(s)/ BSPMaster
Redundant units: GroomServer(s)
Fault detection: System monitor, heartbeat.
Fault recovery: Fail over
Architecture
Task Failure
The execution of a task is spawned from the GroomServer so that the failure of the task would not pull down the GroomServer. Following steps are performed in the senario of task failure.
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\[3\]. Bulk Synchronous Parallel Computing -- A Paradigm for Transportable Software. http://portal.acm.org/citation.cfm?id=798134 |
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\[4\]. Patterns for Fault Tolerant Software. http://portal.acm.org/citation.cfm?id=1557393 |
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\[5\]. Supervisor Behaviour. http://www.erlang.org/doc/design_principles/sup_princ.html |
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\[6\]. Extensible Resource Management For Cluster Computing. http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=603418 |