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https://issues.apache.org/jira/browse/HDFS-8955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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bijaya reassigned HDFS-8955:
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Assignee: bijaya (was: Liang Xie)
> 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: bijaya
> 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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