Mikhail Khludnev commented on SOLR-13029:

Just an idea for test coverage, we can inject illegal numbers via config and 
assert code failure. WDYT?

> 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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