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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-13029) Allow HDFS backup/restore buffer size to be configured
Date Sat, 19 Jan 2019 18:47:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-13029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16747234#comment-16747234
] 

Mikhail Khludnev commented on SOLR-13029:
-----------------------------------------

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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