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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/02/08 21:53:44 UTC
[GitHub] [iotdb] ope-nz opened a new issue #2663: Constant High CPU Usage
ope-nz opened a new issue #2663:
URL: https://github.com/apache/iotdb/issues/2663
**Describe the bug**
I have a small IOTDB instance running on Ubuntu. Over time the CPU utilisation is very high even though there are a low number of clients and transactions. The CPU usage appears to climb over time. This system has been running for several weeks without a restart. If I run "ps -ef" I can see that it is IOTDB that is using the CPU constantly.
Below is the CPU usage before and after I ran stop-server/start-server. The CPU dropped from > 80% down to < 10%.
**To Reproduce**
Steps to reproduce the behavior:
1. Run IOTDB 11.0 with default settings
**Expected behavior**
The CPU usage should not be so high.
**Screenshots**
See above.
**Desktop (please complete the following information):**
- OS: Ubuntu 20.04.1 LTS
- Browser Not Applicable
- Version 11.0
**Additional context**
None
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[GitHub] [iotdb] qiaojialin commented on issue #2663: Constant High CPU Usage
Posted by GitBox <gi...@apache.org>.
qiaojialin commented on issue #2663:
URL: https://github.com/apache/iotdb/issues/2663#issuecomment-775609624
Step 1: Could you upload the logs during the high cpu usage?
Step 2: If possible, could you please use JProfiler to record the CPU when the CPU usage is high, and save it as a .jps snapshot file, then we can see what happens.
Step 3: Some config that may solve the problem:
* iotdb-engine.properties
* enable_unseq_compaction=false
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[GitHub] [iotdb] ope-nz commented on issue #2663: Constant High CPU Usage
Posted by GitBox <gi...@apache.org>.
ope-nz commented on issue #2663:
URL: https://github.com/apache/iotdb/issues/2663#issuecomment-775492748
I have upgraded to 11.2 so I will monitor and see if the issue persists.
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[GitHub] [iotdb] ope-nz commented on issue #2663: Constant High CPU Usage
Posted by GitBox <gi...@apache.org>.
ope-nz commented on issue #2663:
URL: https://github.com/apache/iotdb/issues/2663#issuecomment-789129291
I am still having the same problem even with "enable_unseq_compaction=false"
I have restarted to captured the logs.
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[GitHub] [iotdb] ope-nz commented on issue #2663: Constant High CPU Usage
Posted by GitBox <gi...@apache.org>.
ope-nz commented on issue #2663:
URL: https://github.com/apache/iotdb/issues/2663#issuecomment-780765512
I have been monitoring the CPU over the past week or so. The image below shows a weeks worth of CPU data. Notice that after a few days the CPU is back up high.
There are no errors in the logs - most logging is info level with query reponse time.
I am going to restart the database with "enable_unseq_compaction=false" and see how that goes.
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