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Posted to dev@lucene.apache.org by "Lucene/Solr QA (JIRA)" <ji...@apache.org> on 2018/06/15 11:33:00 UTC
[jira] [Commented] (SOLR-11985) Allow percentage in replica
attribute in policy
[ https://issues.apache.org/jira/browse/SOLR-11985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16513682#comment-16513682 ]
Lucene/Solr QA commented on SOLR-11985:
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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} 3m 15s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 3m 55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 3m 55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Release audit (RAT) {color} | {color:green} 3m 55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Check forbidden APIs {color} | {color:green} 3m 55s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} Validate source patterns {color} | {color:green} 3m 55s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 13m 50s{color} | {color:green} solrj in the patch passed. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 27m 52s{color} | {color:black} {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | SOLR-11985 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12927839/SOLR-11985.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 / 772e171 |
| ant | version: Apache Ant(TM) version 1.9.6 compiled on July 8 2015 |
| Default Java | 1.8.0_172 |
| Test Results | https://builds.apache.org/job/PreCommit-SOLR-Build/124/testReport/ |
| modules | C: solr/solrj U: solr/solrj |
| Console output | https://builds.apache.org/job/PreCommit-SOLR-Build/124/console |
| Powered by | Apache Yetus 0.7.0 http://yetus.apache.org |
This message was automatically generated.
> Allow percentage in replica attribute in policy
> -----------------------------------------------
>
> Key: SOLR-11985
> URL: https://issues.apache.org/jira/browse/SOLR-11985
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling, SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Noble Paul
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: SOLR-11985.patch
>
>
> Today we can only specify an absolute number in the 'replica' attribute in the policy rules. It'd be useful to write a percentage value to make certain use-cases easier. For example:
> {code:java}
> // Keep a third of the the replicas of each shard in east region
> {"replica" : "<34%", "shard" : "#EACH", "sysprop:region": "east"}
> // Keep two thirds of the the replicas of each shard in west region
> {"replica" : "<67%", "shard" : "#EACH", "sysprop:region": "west"}
> {code}
> Today the above must be represented by different rules for each collection if they have different replication factors. Also if the replication factor changes later, the absolute value has to be changed in tandem. So expressing a percentage removes both of these restrictions.
> This feature means that the value of the attribute {{"replica"}} is only available just in time. We call such values {{"computed values"}} . The computed value for this attribute depends on other attributes as well.
> Take the following 2 rules
> {code:java}
> //example 1
> {"replica" : "<34%", "shard" : "#EACH", "sysprop:region": "east"}
> //example 2
> {"replica" : "<34%", "sysprop:region": "east"}
> {code}
> assume we have collection {{"A"}} with 2 shards and {{replicationFactor=3}}
> *example 1* would mean that the value of replica is computed as
> {{3 * 34 / 100 = 1.02}}
> Which means *_for each shard_* keep less than 1.02 replica in east availability zone
>
> *example 2* would mean that the value of replica is computed as
> {{3 * 2 * 34 / 100 = 2.04}}
>
> which means _*for each collection*_ keep less than 2.04 replicas on east availability zone
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