Gang Xie created HDFS-13571:
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Summary: Dead datanode detector
Key: HDFS-13571
URL: https://issues.apache.org/jira/browse/HDFS-13571
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs-client
Affects Versions: 3.0.2, 2.6.0, 2.4.0
Reporter: Gang Xie
Fix For: 3.0.2
Currently, the information of the dead datanode in DFSInputStream in stored
locally. So, it could not be shared among the inputstreams of the same
DFSClient. In our production env, every days, some datanodes dies with
different causes. At this time, after the first inputstream blocked and detect
this, it could share this information to others in the same DFSClient, thus,
the ohter inputstreams are still blocked by the dead node for some time, which
could cause bad service latency.
To eliminate this impact from dead datanode, we designed a dead datanode
detector, which detect the dead ones in advance, and share this information
among all the inputstreams in the same client. This improvement has being
online for some months and works fine. So, we decide to port to the 3.0 (the
version used in our production env is 2.4 and 2.6).
I will do the porting work and upload the code later.
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