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https://issues.apache.org/jira/browse/HBASE-27246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17584631#comment-17584631
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Hudson commented on HBASE-27246:
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Results for branch branch-2
[build #626 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2/626/]:
(x) *{color:red}-1 overall{color}*
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-- See build output for details.
(/) {color:green}+1 client integration test{color}
> RSGroupMappingScript#getRSGroup has thread safety problem
> ---------------------------------------------------------
>
> Key: HBASE-27246
> URL: https://issues.apache.org/jira/browse/HBASE-27246
> Project: HBase
> Issue Type: Bug
> Components: rsgroup
> Reporter: Yutong Xiao
> Assignee: Yutong Xiao
> Priority: Major
> Fix For: 2.6.0, 2.5.1, 3.0.0-alpha-4, 2.4.15
>
> Attachments: Test.java, result.png
>
>
> We are using version 1.4.12 and met a problem in table creation phase some
> time. The master branch also has this problem. The error message is:
> {code:java}
> 2022-07-26 19:26:20.122 [http-nio-8078-exec-24,d2ad4b13b542b6fb] ERROR
> HBaseServiceImpl - hbase create table: xxx:xxxx failed.
> (HBaseServiceImpl.java:116)
> java.lang.RuntimeException:
> org.apache.hadoop.hbase.constraint.ConstraintException:
> org.apache.hadoop.hbase.constraint.ConstraintException: Default RSGroup
> (default
> default) for this table's namespace does not exist.
> {code}
> The rsgroup here should be one 'default' but not two consecutive 'default'.
> The code to get RSGroup from a mapping script is:
> {code:java}
> String getRSGroup(String namespace, String tablename) {
> if (rsgroupMappingScript == null) {
> return null;
> }
> String[] exec = rsgroupMappingScript.getExecString();
> exec[1] = namespace;
> exec[2] = tablename;
> try {
> rsgroupMappingScript.execute();
> } catch (IOException e) {
> // This exception may happen, like process doesn't have permission to
> run this script.
> LOG.error("{}, placing {} back to default rsgroup", e.getMessage(),
> TableName.valueOf(namespace, tablename));
> return RSGroupInfo.DEFAULT_GROUP;
> }
> return rsgroupMappingScript.getOutput().trim();
> }
> {code}
> here the rsgourpMappingScript could be executed by multi-threads.
> To test it is a multi-thread issue, I ran a piece of code locally and found
> that the hadoop ShellCommandExecutor is not thread-safe (I run the code with
> hadoop 2.10.0 and 3.3.2). So that we should make this method synchronized.
> Besides, I found that this issue is retained in master branch also.
> The test code is attached and my rsgroup mapping script is very simple:
> {code:java}
> #!/bin/bash
> namespace=$1
> tablename=$2
> echo default
> {code}
> The reproduced screenshot is also attached.
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