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https://issues.apache.org/jira/browse/SOLR-13029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16747234#comment-16747234
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Mikhail Khludnev commented on SOLR-13029:
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bq. I used a heap dump to confirm that the buffer really was the size I set in
the configuration.
I don't think we can afford it with Jenkins.
> Allow HDFS backup/restore buffer size to be configured
> ------------------------------------------------------
>
> Key: SOLR-13029
> URL: https://issues.apache.org/jira/browse/SOLR-13029
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Backup/Restore, hdfs
> Affects Versions: 7.5, 8.0
> Reporter: Tim Owen
> Priority: Major
> Attachments: SOLR-13029.patch, SOLR-13029.patch
>
>
> There's a default hardcoded buffer size setting of 4096 in the HDFS code
> which means in particular that restoring a backup from HDFS takes a long
> time. Copying multi-GB files from HDFS using a buffer as small as 4096 bytes
> is very inefficient. We changed this in our local build used in production to
> 256kB and saw a 10x speed improvement when restoring a backup. Attached patch
> simply makes this size configurable using a command line setting, much like
> several other buffer size values.
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