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https://issues.apache.org/jira/browse/HDFS-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150009#comment-13150009
]
Todd Lipcon commented on HDFS-2246:
-----------------------------------
another note: the "benchmark" included is in fact a benchmark of string
formatting. All of the threads are spending the majority of their time at the
following stack:
{code}
"Thread-2" prio=10 tid=0x00007ff7b41ea800 nid=0x6502 runnable
[0x00007ff7b3cfb000]
java.lang.Thread.State: RUNNABLE
at java.lang.Integer.getChars(Integer.java:370)
at
java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:615)
at java.lang.StringBuilder.append(StringBuilder.java:229)
at
org.apache.hadoop.hdfs.TestShortCircuitLocalRead.checkData(TestShortCircuitLocalRead.java:92)
at
org.apache.hadoop.hdfs.TestShortCircuitLocalRead.checkFullFile(TestShortCircuitLocalRead.java:118)
at
org.apache.hadoop.hdfs.TestShortCircuitLocalRead$3.run(TestShortCircuitLocalRead.java:269)
{code}
> Shortcut a local client reads to a Datanodes files directly
> -----------------------------------------------------------
>
> Key: HDFS-2246
> URL: https://issues.apache.org/jira/browse/HDFS-2246
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Sanjay Radia
> Attachments: 0001-HDFS-347.-Local-reads.patch,
> HDFS-2246-branch-0.20-security-205.1.patch,
> HDFS-2246-branch-0.20-security-205.2.patch,
> HDFS-2246-branch-0.20-security-205.patch,
> HDFS-2246-branch-0.20-security-205.patch,
> HDFS-2246-branch-0.20-security-205.patch,
> HDFS-2246-branch-0.20-security.3.patch,
> HDFS-2246-branch-0.20-security.no-softref.patch,
> HDFS-2246-branch-0.20-security.patch, HDFS-2246-branch-0.20-security.patch,
> HDFS-2246-trunk.patch, HDFS-2246-trunk.patch, HDFS-2246.20s.1.patch,
> HDFS-2246.20s.2.txt, HDFS-2246.20s.3.txt, HDFS-2246.20s.4.txt,
> HDFS-2246.20s.patch, localReadShortcut20-security.2patch
>
>
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