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https://issues.apache.org/jira/browse/HDFS-4265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14320971#comment-14320971
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Akira AJISAKA commented on HDFS-4265:
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and thanks [~ikelly] for help.
> BKJM doesn't take advantage of speculative reads
> ------------------------------------------------
>
> Key: HDFS-4265
> URL: https://issues.apache.org/jira/browse/HDFS-4265
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: 2.2.0
> Reporter: Ivan Kelly
> Assignee: Rakesh R
> Fix For: 2.7.0
>
> Attachments: 0005-HDFS-4265.patch, 0006-HDFS-4265.patch,
> 0007-HDFS-4265.patch, 0009-HDFS-4265.patch, 001-HDFS-4265.patch,
> 002-HDFS-4265.patch, 003-HDFS-4265.patch, 004-HDFS-4265.patch
>
>
> BookKeeperEditLogInputStream reads entry at a time, so it doesn't take
> advantage of the speculative read mechanism introduced by BOOKKEEPER-336.
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