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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/02/05 06:43:07 UTC
[GitHub] [shardingsphere] tuohai666 opened a new issue #9341: Connections may block when execute DDL in concurrency
tuohai666 opened a new issue #9341:
URL: https://github.com/apache/shardingsphere/issues/9341
## Bug Report
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### Which version of ShardingSphere did you use?
5.0.0-RC1-SNAPSHOT
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
Execute DDL in concurrency correctly.
### Actual behavior
Connections may block when execute DDL in concurrency.
When I use sysbench to test the benchmark of ShardingSphere-Proxy, the prepare step blocked. The sysbench command as following:
```
sysbench --mysql-host=xxx.xxx.xxx.xxx --mysql-port=3307 --mysql-user=root --mysql-password='root' --mysql-db=sharding_db --tables=10 --table-size=0 --report-interval=10 --time=0 --num-threads=100 --max-requests=0 --percentile=99 --range_selects=off --test=/usr/local/share/sysbench/oltp_write_only.lua prepare
```
This command helps to create tables and indexes:
```
Initializing worker threads...
Creating table 'sbtest7'...
Creating table 'sbtest6'...
Creating table 'sbtest9'...
Creating table 'sbtest8'...
Creating table 'sbtest2'...
Creating table 'sbtest5'...
Creating table 'sbtest1'...
Creating table 'sbtest4'...
Creating table 'sbtest10'...
Creating table 'sbtest3'...
Creating a secondary index on 'sbtest8'...
Creating a secondary index on 'sbtest1'...
Creating a secondary index on 'sbtest7'...
Creating a secondary index on 'sbtest4'...
Creating a secondary index on 'sbtest9'...
Creating a secondary index on 'sbtest5'...
Creating a secondary index on 'sbtest6'...
Creating a secondary index on 'sbtest10'...
Creating a secondary index on 'sbtest3'...
Creating a secondary index on 'sbtest2'...
```
The script hangs and will never be finished.
From the perspective of the network:
I tracked the port 42048, and found the SQL command 'CREATE INDEX' did not get a 'Response OK' packet.
### Reason analyze (If you can)
The state of Proxy may incorrect when execute DDL, lead to skip executing the SQL command.
SignalAll() may take affect before the eventbus before it. If so, the state will incorrect(still in Lock state) when the wait thread is notified, and the thread will execute nothing.
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
### Example codes for reproduce this issue (such as a github link).
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[GitHub] [shardingsphere] tuohai666 closed issue #9341: Connections may block when execute DDL in concurrency
Posted by GitBox <gi...@apache.org>.
tuohai666 closed issue #9341:
URL: https://github.com/apache/shardingsphere/issues/9341
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