Getting Error in Nexus.log too many open files

post by Jagdish_Shripati on Apr 27

Hi Team,

We are running Nexus 3.29 OSS and got below error in nexus.log

Caused by: java.io.FileNotFoundException: /app/nexus_home/sonatype-work/nexus3/db/frozen.marker (Too many open files)

at java.io.FileInputStream.open0(Native Method)

at java.io.FileInputStream.open(FileInputStream.java:195)

at java.io.FileInputStream.(FileInputStream.java:138)

at com.fasterxml.jackson.core.JsonFactory.createParser(JsonFactory.java:916)

at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3351)

at org.sonatype.nexus.orient.internal.freeze.LocalDatabaseFrozenStateManager.readMarkerFile(LocalDatabaseFrozenStateManager.java:122)

… 104 common frames omitted

2026-04-27 06:30:01,536+0800 ERROR [quartz-15-thread-13] *SYSTEM org.sonatype.nexus.blobstore.file.internal.FileBlobStoreMetricsStore - Blob store metrics cannot be accessed

org.sonatype.nexus.blobstore.BlobStoreMetricsNotAvailableException: java.nio.file.FileSystemException: /app/test: Too many open files

at org.sonatype.nexus.blobstore.file.internal.FileBlobStoreMetricsStore.backingFiles(FileBlobStoreMetricsStore.java:98)

at org.sonatype.nexus.blobstore.BlobStoreMetricsStoreSupport.getMetrics(BlobStoreMetricsStoreSupport.java:192)

at org.sonatype.nexus.blobstore.file.internal.FileBlobStoreMetricsStore$$EnhancerByGuice$$1280e16a.CGLIB$getMetrics$10()

at org.sonatype.nexus.blobstore.file.internal.FileBlobStoreMetricsStore$$EnhancerByGuice$$1280e16a$$FastClassByGuice$$200cb1f.invoke()

at com.google.inject.internal.cglib.proxy.$MethodProxy.invokeSuper(MethodProxy.java:228)

java.io.IOException: Too many open files

java.io.IOException: Too many open files

Post above error, nexus instance url was giving error 404 error, URL request time out. Could you please let me know how to fix the error?

Below ulimit -n set for user

ulimit -n

65536

post by mpiggott on Apr 27

Your system is applying a limit to the number of files that Nexus can open, you’ll need to update it.

This support document is for Nexus 2, but the instructions for the various OSes may be helpful - link

post by Jagdish_Shripati on Apr 28

Hi Matthew,

As I mentioned, we are using Nexus 3.29 and we already have below configured for user.

ulimit -Hn

65536

ulimit -Sn

65536

We are running Nexus process as below not through service.

./nexus start

./nexus stop

As we already have configured ulimit to 65536, not sure why still getting Too many open files error

org.sonatype.nexus.blobstore.BlobStoreMetricsNotAvailableException: java.nio.file.FileSystemException: /app/test: Too many open files

Could you please help to check if any other things we need to configure to avoid this error.

Thanks,

Jagdish

post by mpiggott on Apr 28

I can only suggest the link provided before, and to ensure the ulimit was applied to the service.

While I doubt it is the cause 3.29 is extremely old.

post by laurencet on Apr 28

Can you show the output of ‘cat /proc/<PID>/limits' (PID of Nexus)?

Also as Matthew pointed out, this is a very old version of Nexus and we have had bugs in the past related to file handle leaks. It may be quicker to upgrade and see how that goes before troubleshooting further.

post by Jagdish_Shripati on Apr 29

Hi Laurence,

Below is the output of ‘cat /proc/3587311/limits’ (PID of Nexus)

cat /proc/3587311/limits

Limit Soft Limit Hard Limit Units

Max cpu time unlimited unlimited seconds

Max file size unlimited unlimited bytes

Max data size unlimited unlimited bytes

Max stack size 8388608 unlimited bytes

Max core file size unlimited unlimited bytes

Max resident set unlimited unlimited bytes

Max processes 65536 65536 processes

Max open files 65536 65536 files

Max locked memory 8388608 8388608 bytes

Max address space unlimited unlimited bytes

Max file locks unlimited unlimited locks

Max pending signals 254973 254973 signals

Max msgqueue size 819200 819200 bytes

Max nice priority 0 0

Max realtime priority 0 0

Max realtime timeout unlimited unlimited us

Yes, we know Nexus version is too old. For now, we are planning to upgrade to 3.70.x as orient db support till 3.70.x version only. Post that we are planning to buy license, so that we can further do upgrade from 3.70.x to latest version with postgresql database.

Thanks,

Jagdish