[HDDS-11594] OM double buffer exception in debug mode

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Labels: pull-request-available
• Assignee: Ashish Kumar
• Reporter: Wei-Chiu Chuang
• Created: 17/Oct/24 17:43
• Updated: 25/Oct/24 15:11
• Resolved: 25/Oct/24 15:11

Description

When OM is in debug log level, I found the following log in the stacktrace:

2024-10-17 17:14:16,288 WARN [om27-OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.StringCodecBase: Decode (hex) 0A 04 76 6F 6C 31 12 07 62 75 63 6B 65 74 31 1A 03 64 73 74 ...
  Attempt failed : UTF-8 (see exception below)
  Retry succeeded: decoded to
^Dvol1^R^Gbucket1^Z^Cdst ����^A(^A0^C:^@^R^^
^P
^L^H^A^P�������^A^P^@^X^@ ����^A(^@H^@ ^@@��ݿ�2HϦ�۩2P^@j^M^H^A^R^Droot^Z^A� ^@j^M^H^B^R^Droot^Z^A� ^@p���������^Ax�R�^A���������^A�^A^A�^A^Droot
java.nio.charset.MalformedInputException: Input length = 1
        at java.nio.charset.CoderResult.throwException(CoderResult.java:281)
        at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:816)
        at org.apache.hadoop.hdds.utils.db.StringCodecBase.decode(StringCodecBase.java:116)
        at org.apache.hadoop.hdds.utils.db.RocksDatabase.bytes2String(RocksDatabase.java:93)
        at org.apache.hadoop.hdds.utils.db.RocksDatabase$ColumnFamily.batchPut(RocksDatabase.java:309)
        at org.apache.hadoop.hdds.utils.db.RDBBatchOperation$OpCache$FamilyCache.prepareBatchWrite(RDBBatchOperation.java:159)
        at org.apache.hadoop.hdds.utils.db.RDBBatchOperation$OpCache.prepareBatchWrite(RDBBatchOperation.java:288)
        at org.apache.hadoop.hdds.utils.db.RDBBatchOperation.commit(RDBBatchOperation.java:347)
        at org.apache.hadoop.hdds.utils.db.RDBStore.commitBatchOperation(RDBStore.java:285)
        at org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.lambda$4(OzoneManagerDoubleBuffer.java:368)
        at org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.flushBatchWithTrace(OzoneManagerDoubleBuffer.java:268)
        at org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.flushBatch(OzoneManagerDoubleBuffer.java:366)
        at org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.flushCurrentBuffer(OzoneManagerDoubleBuffer.java:329)
        at org.apache.hadoop.ozone.om.ratis.OzoneManagerDoubleBuffer.flushTransactions(OzoneManagerDoubleBuffer.java:296)
        at java.lang.Thread.run(Thread.java:748) 

It just prints a scary warning but the exception is caught and proceed. So it's okay.

Issue Links

• links to: GitHub Pull Request #7356