100% CPU usage on a specific node in DataStax Enterprise
- DataStax Enterprise (DSE) 6.0 and above.
- While checking the CPU usage of a specific node, a constant CPU usage of 100% was observed
- The following error can also be seen repeating constantly on the faulty node:
ERROR [CoreThread-1] 2018-09-14 07:45:16,397 EpollTPCEventLoopGroup.java:730 - Task exception encountered: java.lang.RuntimeException: Failed to process class org.apache.cassandra.db.ReadResponse$LocalResponse$$Lambda$850/425059782 at org.apache.cassandra.utils.LineNumberInference.maybeProcessClassInternal(LineNumberInference.java:229) Caused by: java.io.FileNotFoundException: /tmp/dse/dse.FKb2MavbG/lni/org/apache/cassandra/db/ReadResponse$LocalResponse$$Lambda$850.class (No such file or directory) at java.io.FileInputStream.open0(Native Method) at java.io.FileInputStream.open(FileInputStream.java:195) at java.io.FileInputStream.<init>(FileInputStream.java:138) at java.io.FileInputStream.<init>(FileInputStream.java:93) at org.apache.cassandra.utils.LineNumberInference.maybeProcessClassInternal(LineNumberInference.java:206) ... 59 common frames omitted ERROR [CoreThread-1] 2018-09-14 07:45:16,397 CassandraDaemon.java:117 - Exception in thread Thread[CoreThread-1,10,main]
An issue was identified in the `LineNumberInference` class
The issue was observed only once and a restart of the node resolved the issue. If the symptoms match, attempt a restart of the node to see if that resolves the issue.
This issue is referenced under DB-2568 and the fix was delivered in DSE 6.0.5 and DSE 6.7.0.