Error in data flush background thread

post by seb on Nov 25, 2020

Sebastian Nielsen

Recently Nexus was upgraded from 2.14.5 to 3.25.0.

After this upgrade we experience intermittent issues where we are unable to upload/download artifacts from the repositories. This presents itself as a generic error 500.

The logs indicate a file cannot be found/read such as

nexus3\db\component\asset.pcl

or

nexus3\db\component\asset_name_ci_idx.sbt

Restarting the Nexus service fixes the problem, though only temporarily.

Any help towards a more permanent fix is greatly appreciated.

The full log contains the following

2020-11-19 19:31:14,938+0100 ERROR [qtp1578666736-8898]  *UNKNOWN com.orientechnologies.orient.core.storage.impl.local.paginated.OLocalPaginatedStorage - Exception `7B9F486D` in storage `plocal:E:/nexus/sonatype-work/nexus3/db/component`: 2.2.36 (build d3beb772c02098ceaea89779a7afd4b7305d3788, branch 2.2.x)
com.orientechnologies.orient.core.exception.OStorageException: Error in data flush background thread, please restart database and send full stack trace inside of bug report
    DB name="component"
    at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.checkLowDiskSpaceRequestsAndReadOnlyConditions(OAbstractPaginatedStorage.java:5104)
    at com.orientechnologies.orient.core.storage.impl.local.OAbstractPaginatedStorage.commit(OAbstractPaginatedStorage.java:1729)
    at com.orientechnologies.orient.core.tx.OTransactionOptimistic.doCommit(OTransactionOptimistic.java:541)
    at com.orientechnologies.orient.core.tx.OTransactionOptimistic.commit(OTransactionOptimistic.java:99)
    at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.commit(ODatabaseDocumentTx.java:2908)
    at com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx.commit(ODatabaseDocumentTx.java:2870)
    at org.sonatype.nexus.repository.storage.StorageTxImpl.commit(StorageTxImpl.java:182)
    ...
Caused by: java.io.FileNotFoundException: E:\nexus\sonatype-work\nexus3\db\component\asset_name_ci_idx.sbt (The process cannot access the file because it is being used by another process)
    at java.io.RandomAccessFile.open0(Native Method)
    at java.io.RandomAccessFile.open(RandomAccessFile.java:316)
    ...

post by rseddon on Nov 25, 2020

Rich Seddon

Caused by: java.io.FileNotFoundException: E:\nexus\sonatype-work\nexus3\db\component\asset_name_ci_idx.sbt (The process cannot access the file because it is being used by another process)

Some other process is holding file locks against database files. Is there a virus scanner on this system? If so, you should exclude the work directory from scanning.