Details
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Type:
Bug
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Status: Resolved
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Priority:
Major
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Resolution: Incomplete
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Affects Version/s: 0.20-append
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Fix Version/s: None
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Component/s: hdfs-client
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Labels:None
Description
1. Say we have 2 racks: rack-0 and rack-1.
Rack-0 has dn1, dn2, dn3. Rack-0 has dn4, dn5, dn6.
2. Suppose client is in rack-0, and the write pipeline is:
client --> localnode --> other rack --> other rack
In this example we have the pipeline client-dn1-dn4-dn6.
That is rack0-rack0-rack1-rack1. So far so good.
3. Now other client comes, and append to file.
This client is also in rack-0. Interestingly,
the append pipeline is client-dn6-dn4-dn1.
That is the new client (from rack0) sends packet
to the first node in pipeline (dn6) which belongs to rack1.
This bug was found by our Failure Testing Service framework:
http://www.eecs.berkeley.edu/Pubs/TechRpts/2010/EECS-2010-98.html
For questions, please email us: Thanh Do (thanhdo@cs.wisc.edu) and
Haryadi Gunawi (haryadi@eecs.berkeley.edu)
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Closing as stale.
This is a valid bug in the 0.20-append branch.