[HDFS-14942] Change Log Level to debug in JournalNodeSyncer#syncWithJournalAtIndex

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.3.0, 3.1.4, 3.2.2
• Hadoop Flags: Reviewed
• Assignee: Lisheng Sun
• Reporter: Lisheng Sun
• Created: 30/Oct/19 07:32
• Updated: 18/Nov/19 18:25
• Resolved: 06/Nov/19 16:36

Description

when hadoop 2.x upgrades to hadoop 3.x,  InterQJournalProtocol is newly added，so  throw Unknown protocol. 

the newly InterQJournalProtocol is used to sychronize past log segments to JNs that missed them.  And that an error occurs does not affect normal service. I think it should not be a ERROR log，and that log a warn log is more reasonable.

 private void syncWithJournalAtIndex(int index) {
  ...
    GetEditLogManifestResponseProto editLogManifest;
    try {
      editLogManifest = jnProxy.getEditLogManifestFromJournal(jid,
          nameServiceId, 0, false);
    } catch (IOException e) {
      LOG.error("Could not sync with Journal at " +
          otherJNProxies.get(journalNodeIndexForSync), e);
      return;
    }

2019-10-30,15:11:17,388 ERROR org.apache.hadoop.hdfs.qjournal.server.JournalNodeSyncer: Could not sync with Journal at mos1-hadoop-prc-ct17.ksru/10.85.3.59:111002019-10-30,15:11:17,388 ERROR org.apache.hadoop.hdfs.qjournal.server.JournalNodeSyncer: Could not sync with Journal at mos1-hadoop-prc-ct17.ksru/10.85.3.59:11100org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.authorize.AuthorizationException): Unknown protocol: org.apache.hadoop.hdfs.qjournal.protocol.InterQJournalProtocol
at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1565)
at org.apache.hadoop.ipc.Client.call(Client.java:1511)
at org.apache.hadoop.ipc.Client.call(Client.java:1421)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
at com.sun.proxy.$Proxy16.getEditLogManifestFromJournal(Unknown Source)
at org.apache.hadoop.hdfs.qjournal.protocolPB.InterQJournalProtocolTranslatorPB.getEditLogManifestFromJournal(InterQJournalProtocolTranslatorPB.java:75)
at org.apache.hadoop.hdfs.qjournal.server.JournalNodeSyncer.syncWithJournalAtIndex(JournalNodeSyncer.java:250)
at org.apache.hadoop.hdfs.qjournal.server.JournalNodeSyncer.syncJournals(JournalNodeSyncer.java:226)
at org.apache.hadoop.hdfs.qjournal.server.JournalNodeSyncer.lambda$startSyncJournalsDaemon$0(JournalNodeSyncer.java:186)
at java.lang.Thread.run(Thread.java:748)

Issue Links

• relates to: HDFS-4025 QJM: Sychronize past log segments to JNs that missed them
• relates to: HDFS-13023 Journal Sync does not work on a secure cluster