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https://issues.apache.org/jira/browse/HDFS-5776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liang Xie updated HDFS-5776:
----------------------------
Description:
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.
was:
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
> Support 'hedged' reads in DFSClient
> -----------------------------------
>
> Key: HDFS-5776
> URL: https://issues.apache.org/jira/browse/HDFS-5776
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 3.0.0
> Reporter: Liang Xie
> Assignee: Liang Xie
> Attachments: HDFS-5776.txt
>
>
> 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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