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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13145) SBN crash when transition to ANN with in-progress edit tailing enabled
Date Tue, 13 Feb 2018 19:23:00 GMT
Chao Sun created HDFS-13145:
-------------------------------

             Summary: SBN crash when transition to ANN with in-progress edit tailing enabled
                 Key: HDFS-13145
                 URL: https://issues.apache.org/jira/browse/HDFS-13145
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha, namenode
            Reporter: Chao Sun
            Assignee: Chao Sun


With edit log in-progress edit log tailing enabled, {{QuorumOutputStream}} will send two batches
to JNs, one normal edit batch followed by a dummy batch to update the commit ID on JNs.

{code}
      QuorumCall<AsyncLogger, Void> qcall = loggers.sendEdits(
          segmentTxId, firstTxToFlush,
          numReadyTxns, data);
      loggers.waitForWriteQuorum(qcall, writeTimeoutMs, "sendEdits");
      
      // Since we successfully wrote this batch, let the loggers know. Any future
      // RPCs will thus let the loggers know of the most recent transaction, even
      // if a logger has fallen behind.
      loggers.setCommittedTxId(firstTxToFlush + numReadyTxns - 1);

      // If we don't have this dummy send, committed TxId might be one-batch
      // stale on the Journal Nodes
      if (updateCommittedTxId) {
        QuorumCall<AsyncLogger, Void> fakeCall = loggers.sendEdits(
            segmentTxId, firstTxToFlush,
            0, new byte[0]);
        loggers.waitForWriteQuorum(fakeCall, writeTimeoutMs, "sendEdits");
      }
{code}

Between each batch, it will wait for the JNs to reach a quorum. However, if the ANN crashes
in between, then SBN will crash while transiting to ANN:

{code}
java.lang.IllegalStateException: Cannot start writing at txid 24312595802 when there is a
stream available for read: ......
        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.openForWrite(FSEditLog.java:329)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startActiveServices(FSNamesystem.java:1196)
        at org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.startActiveServices(NameNode.java:1839)
        at org.apache.hadoop.hdfs.server.namenode.ha.ActiveState.enterState(ActiveState.java:61)
        at org.apache.hadoop.hdfs.server.namenode.ha.HAState.setStateInternal(HAState.java:64)
        at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.setState(StandbyState.java:49)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.transitionToActive(NameNode.java:1707)
        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.transitionToActive(NameNodeRpcServer.java:1622)
        at org.apache.hadoop.ha.protocolPB.HAServiceProtocolServerSideTranslatorPB.transitionToActive(HAServiceProtocolServerSideTranslatorPB.java:107)
        at org.apache.hadoop.ha.proto.HAServiceProtocolProtos$HAServiceProtocolService$2.callBlockingMethod(HAServiceProtocolProtos.java:4460)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:447)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:851)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:794)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1836)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2490)
2018-02-13 00:43:20,728 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
{code}

This is because without the dummy batch, the {{commitTxnId}} will lag behind the {{endTxId}},
which caused the check in {{openForWrite}} to fail:
{code}
    List<EditLogInputStream> streams = new ArrayList<EditLogInputStream>();
    journalSet.selectInputStreams(streams, segmentTxId, true, false);
    if (!streams.isEmpty()) {
      String error = String.format("Cannot start writing at txid %s " +
        "when there is a stream available for read: %s",
        segmentTxId, streams.get(0));
      IOUtils.cleanupWithLogger(LOG,
          streams.toArray(new EditLogInputStream[0]));
      throw new IllegalStateException(error);
    }
{code}

In our environment, this can be reproduced pretty consistently, which will leave the cluster
with no running namenodes. Even though we are using a 2.8.2 backport, I believe the same issue
also exist in 3.0.x. 



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