bijaya created HDFS-8955:
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Summary: Support 'hedged' write in DFSClient
Key: HDFS-8955
URL: https://issues.apache.org/jira/browse/HDFS-8955
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs-client
Affects Versions: 3.0.0
Reporter: bijaya
Assignee: Liang Xie
Fix For: 2.4.0
This is a placeholder of hdfs related stuff backport from
https://issues.apache.org/jira/browse/HBASE-7509
The quorum read ability should be helpful especially to optimize read outliers
we can utilize "dfs.dfsclient.quorum.read.threshold.millis" &
"dfs.dfsclient.quorum.read.threadpool.size" to enable/disable the hedged read
ability from client side(e.g. HBase), and by using DFSQuorumReadMetrics, we
could export the interested metric valus into client system(e.g. HBase's
regionserver metric).
The core logic is in pread code path, we decide to goto the original
fetchBlockByteRange or the new introduced fetchBlockByteRangeSpeculative per
the above config items.
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