Hi All,
Cassandra 3.11.4.
On one of our clusters, during startup, I see two types of "Harmless
error" notification regarding the keycache:
*Server 1:*
INFO [pool-3-thread-1] 2020-01-23 04:34:46,167
AutoSavingCache.java:263 - *Harmless
error reading saved cache* /path/to/saved_caches/KeyCache-e.db
*java.lang.NegativeArraySizeException: null*
at
org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:401)
at
org.apache.cassandra.service.CacheService$KeyCacheSerializer.deserialize(CacheService.java:472)
at
org.apache.cassandra.cache.AutoSavingCache.loadSaved(AutoSavingCache.java:220)
at
org.apache.cassandra.cache.AutoSavingCache$3.call(AutoSavingCache.java:165)
at
org.apache.cassandra.cache.AutoSavingCache$3.call(AutoSavingCache.java:161)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
INFO [pool-3-thread-1] 2020-01-23 04:34:46,168 AutoSavingCache.java:174 -
Completed loading (188 ms; 10916 keys) KeyCache cache
*Server 2:*
INFO [pool-3-thread-1] 2020-01-15 11:18:35,797 AutoSavingCache.java:263 -
Harmless error reading saved cache /path/to/saved_caches//KeyCache-e.db
*java.io.IOException: Corrupted key cache. Key length of 489735494 is
longer than maximum of 65535*
at
org.apache.cassandra.service.CacheService$KeyCacheSerializer.deserialize(CacheService.java:469)
at
org.apache.cassandra.cache.AutoSavingCache.loadSaved(AutoSavingCache.java:220)
at
org.apache.cassandra.cache.AutoSavingCache$3.call(AutoSavingCache.java:165)
at
org.apache.cassandra.cache.AutoSavingCache$3.call(AutoSavingCache.java:161)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
INFO [pool-3-thread-1] 2020-01-15 11:18:35,799 AutoSavingCache.java:174 -
Completed loading (285 ms; 20681 keys) KeyCache cache
The KeyCache size is a lot less than max default (100MB). So does this mean
that the key itself is the culprit?
I'd really appreciate some guidance on what this message actually means in
the logs during startup and what problems may arise from it.
I see that one of the nodes experiences high CPU load and even gets kernel
panic from time to time, so I want to understand if the above may cause
such issues.
Thanks a lot!
