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https://issues.apache.org/jira/browse/SOLR-13029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16750953#comment-16750953
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Lucene/Solr QA commented on SOLR-13029:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  4m 
11s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  2m  
5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  2m  
5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Release audit (RAT) {color} | 
{color:green}  2m  5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Check forbidden APIs {color} | 
{color:green}  2m  5s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Validate source patterns {color} | 
{color:green}  2m  5s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 77m 54s{color} 
| {color:red} core in the patch failed. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 88m  9s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | solr.cloud.autoscaling.sim.TestSimExtremeIndexing |
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|| Subsystem || Report/Notes ||
| JIRA Issue | SOLR-13029 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12955939/SOLR-13029.patch |
| Optional Tests |  compile  javac  unit  ratsources  checkforbiddenapis  
validatesourcepatterns  |
| uname | Linux lucene2-us-west.apache.org 4.4.0-112-generic #135-Ubuntu SMP 
Fri Jan 19 11:48:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | ant |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-SOLR-Build/sourcedir/dev-tools/test-patch/lucene-solr-yetus-personality.sh
 |
| git revision | master / 72a99e9 |
| ant | version: Apache Ant(TM) version 1.9.6 compiled on July 20 2018 |
| Default Java | 1.8.0_191 |
| unit | 
https://builds.apache.org/job/PreCommit-SOLR-Build/266/artifact/out/patch-unit-solr_core.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-SOLR-Build/266/testReport/ |
| modules | C: solr/core U: solr/core |
| Console output | 
https://builds.apache.org/job/PreCommit-SOLR-Build/266/console |
| Powered by | Apache Yetus 0.7.0   http://yetus.apache.org |


This message was automatically generated.



> 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, 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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