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https://issues.apache.org/jira/browse/HDFS-8356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175339#comment-15175339
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Akira AJISAKA commented on HDFS-8356:
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Reviewed from "dfs.client.retry.interval-ms.get-last-block-length" to
"dfs.client.write.byte-array-manager.count-threshold".
1. In "dfs.client.retry.window.base", the wait time is extended linearly, not
exponentially.
{code:title=DFSInputStream.java}
// Introducing a random factor to the wait time before another retry.
// The wait time is dependent on # of failures and a random factor.
// At the first time of getting a BlockMissingException, the wait time
// is a random number between 0..3000 ms. If the first retry
// still fails, we will wait 3000 ms grace period before the 2nd
retry.
// Also at the second retry, the waiting window is expanded to 6000 ms
// alleviating the request rate from the server. Similarly the 3rd
retry
// will wait 6000ms grace period before retry and the waiting window
is
// expanded to 9000ms.
{code}
In addition, would you add a time unit to the description?
2. "dfs.client.hedged.threadpool.size" should be
"dfs.client.hedged.read.threadpool.size", and "dfs.client.threshold.millis"
should be "dfs.client.hedged.read.threshold.millis". (Please see HDFS-9886 for
the detail.)
> Document missing properties in hdfs-default.xml
> -----------------------------------------------
>
> Key: HDFS-8356
> URL: https://issues.apache.org/jira/browse/HDFS-8356
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: documentation
> Affects Versions: 2.7.0
> Reporter: Ray Chiang
> Assignee: Ray Chiang
> Labels: supportability, test
> Attachments: HDFS-8356.001.patch, HDFS-8356.002.patch,
> HDFS-8356.003.patch, HDFS-8356.004.patch, HDFS-8356.005.patch
>
>
> The following properties are currently not defined in hdfs-default.xml. These
> properties should either be
> A) documented in hdfs-default.xml OR
> B) listed as an exception (with comments, e.g. for internal use) in the
> TestHdfsConfigFields unit test
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