[ 
https://issues.apache.org/jira/browse/HDDS-8786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730368#comment-17730368
 ] 

Dave Teng commented on HDDS-8786:
---------------------------------

{code:java}
2023-06-08 02:01:14,175 [Timer for 'OzoneManager' metrics system] ERROR 
org.apache.hadoop.hdds.utils.RocksDBStoreMetrics: Failed to get property
 mem-table-flush-pending from rocksdb
java.io.IOException: Rocks Database is closed
        at 
org.apache.hadoop.hdds.utils.db.RocksDatabase.assertClose(RocksDatabase.java:442)
        at 
org.apache.hadoop.hdds.utils.db.RocksDatabase.getProperty(RocksDatabase.java:779)
        at 
org.apache.hadoop.hdds.utils.RocksDBStoreMetrics.getDBPropertyData(RocksDBStoreMetrics.java:214)
        at 
org.apache.hadoop.hdds.utils.RocksDBStoreMetrics.getMetrics(RocksDBStoreMetrics.java:151)
        at 
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMetrics(MetricsSourceAdapter.java:200)
        at 
org.apache.hadoop.metrics2.impl.MetricsSystemImpl.snapshotMetrics(MetricsSystemImpl.java:419)
        at 
org.apache.hadoop.metrics2.impl.MetricsSystemImpl.sampleMetrics(MetricsSystemImpl.java:406)
        at 
org.apache.hadoop.metrics2.impl.MetricsSystemImpl.onTimerEvent(MetricsSystemImpl.java:381)
        at 
org.apache.hadoop.metrics2.impl.MetricsSystemImpl$4.run(MetricsSystemImpl.java:368)
        at java.util.TimerThread.mainLoop(Timer.java:555)
        at java.util.TimerThread.run(Timer.java:505) {code}

> Encounter error of OzoneManagerDoubleBuffer Terminating during snapshot 
> creation
> --------------------------------------------------------------------------------
>
>                 Key: HDDS-8786
>                 URL: https://issues.apache.org/jira/browse/HDDS-8786
>             Project: Apache Ozone
>          Issue Type: Bug
>          Components: Ozone Manager
>            Reporter: Dave Teng
>            Priority: Major
>              Labels: ozone-snapshot
>
> When creating snapshot, encountered following error in OM:
> {code:java}
> 2023-06-08 02:01:14,771 [OMDoubleBufferFlushThread] ERROR 
> org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer: Terminating with 
> exit statu
> s 1: During flush to DB encountered error in OMDoubleBuffer flush thread 
> OMDoubleBufferFlushThread when handling OMRequest: cmdType: CreateSnaps
> hot
> traceID: ""
> success: true
> status: OK
> CreateSnapshotResponse {
>   snapshotInfo {
>     snapshotID: "3ce30204-da71-41ad-9e78-607c688e8c5c"
>     name: "snap5670"
>     volumeName: "vol2"
>     bucketName: "bucket2"
>     snapshotStatus: SNAPSHOT_ACTIVE
>     creationTime: 1686189673557
>     deletionTime: 18446744073709551615
>     pathPreviousSnapshotID: "180bd9f4-a83e-4bfb-97b3-a19d0eef0450"
>     globalPreviousSnapshotID: "180bd9f4-a83e-4bfb-97b3-a19d0eef0450"
>     snapshotPath: "vol2/bucket2"
>     checkpointDir: "-3ce30204-da71-41ad-9e78-607c688e8c5c"
>     dbTxSequenceNumber: 3269138
>   }
> }
> java.io.IOException: Rocks Database is closed
>         at 
> org.apache.hadoop.hdds.utils.db.RocksDatabase.assertClose(RocksDatabase.java:442)
>         at 
> org.apache.hadoop.hdds.utils.db.RocksDatabase.newIterator(RocksDatabase.java:827)
>         at 
> org.apache.hadoop.hdds.utils.db.RDBTable.iterator(RDBTable.java:194)
>         at 
> org.apache.hadoop.hdds.utils.db.TypedTable.iterator(TypedTable.java:361)
>         at 
> org.apache.hadoop.ozone.om.OmSnapshotManager.deleteKeysFromDelKeyTableInSnapshotScope(OmSnapshotManager.java:573)
>         at 
> org.apache.hadoop.ozone.om.OmSnapshotManager.createOmSnapshotCheckpoint(OmSnapshotManager.java:394)
>         at 
> org.apache.hadoop.ozone.om.response.snapshot.OMSnapshotCreateResponse.addToDBBatch(OMSnapshotCreateResponse.java:81)
>         at 
> org.apache.hadoop.ozone.om.response.OMClientResponse.checkAndUpdateDB(OMClientResponse.java:73)
>         at 
> org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.lambda$5(OzoneManagerDoubleBuffer.java:414)
> at 
> org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.addToBatchWithTrace(OzoneManagerDoubleBuffer.java:237)
>         at 
> org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.addToBatch(OzoneManagerDoubleBuffer.java:412)
>         at 
> org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.flushBatch(OzoneManagerDoubleBuffer.java:333)
>         at 
> org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.flushCurrentBuffer(OzoneManagerDoubleBuffer.java:312)
>         at 
> org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.flushTransactions(OzoneManagerDoubleBuffer.java:277)
>         at java.lang.Thread.run(Thread.java:748) {code}



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