Package org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos

Examples of org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos.SegmentStateProto

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      LOG.info("None of the responders had a log to recover: " +
          QuorumCall.mapToString(prepareResponses));
      return;
    }
   
    SegmentStateProto logToSync = bestResponse.getSegmentState();
    assert segmentTxId == logToSync.getStartTxId();
   
    // Sanity check: none of the loggers should be aware of a higher
    // txid than the txid we intend to truncate to
    for (Map.Entry<AsyncLogger, PrepareRecoveryResponseProto> e :
         prepareResponses.entrySet()) {
      AsyncLogger logger = e.getKey();
      PrepareRecoveryResponseProto resp = e.getValue();

      if (resp.hasLastCommittedTxId() &&
          resp.getLastCommittedTxId() > logToSync.getEndTxId()) {
        throw new AssertionError("Decided to synchronize log to " + logToSync +
            " but logger " + logger + " had seen txid " +
            resp.getLastCommittedTxId() + " committed");
      }
    }
   
    URL syncFromUrl = bestLogger.buildURLToFetchLogs(segmentTxId);
   
    QuorumCall<AsyncLogger,Void> accept = loggers.acceptRecovery(logToSync, syncFromUrl);
    loggers.waitForWriteQuorum(accept, acceptRecoveryTimeoutMs,
        "acceptRecovery(" + TextFormat.shortDebugString(logToSync) + ")");

    // If one of the loggers above missed the synchronization step above, but
    // we send a finalize() here, that's OK. It validates the log before
    // finalizing. Hence, even if it is not "in sync", it won't incorrectly
    // finalize.
    QuorumCall<AsyncLogger, Void> finalize =
        loggers.finalizeLogSegment(logToSync.getStartTxId(), logToSync.getEndTxId());
    loggers.waitForWriteQuorum(finalize, finalizeSegmentTimeoutMs,
        String.format("finalizeLogSegment(%s-%s)",
            logToSync.getStartTxId(),
            logToSync.getEndTxId()));
  }
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      LOG.info("None of the responders had a log to recover: " +
          QuorumCall.mapToString(prepareResponses));
      return;
    }
   
    SegmentStateProto logToSync = bestResponse.getSegmentState();
    assert segmentTxId == logToSync.getStartTxId();
   
    // Sanity check: none of the loggers should be aware of a higher
    // txid than the txid we intend to truncate to
    for (Map.Entry<AsyncLogger, PrepareRecoveryResponseProto> e :
         prepareResponses.entrySet()) {
      AsyncLogger logger = e.getKey();
      PrepareRecoveryResponseProto resp = e.getValue();

      if (resp.hasLastCommittedTxId() &&
          resp.getLastCommittedTxId() > logToSync.getEndTxId()) {
        throw new AssertionError("Decided to synchronize log to " + logToSync +
            " but logger " + logger + " had seen txid " +
            resp.getLastCommittedTxId() + " committed");
      }
    }
   
    URL syncFromUrl = bestLogger.buildURLToFetchLogs(segmentTxId);
   
    QuorumCall<AsyncLogger,Void> accept = loggers.acceptRecovery(logToSync, syncFromUrl);
    loggers.waitForWriteQuorum(accept, acceptRecoveryTimeoutMs,
        "acceptRecovery(" + TextFormat.shortDebugString(logToSync) + ")");

    // If one of the loggers above missed the synchronization step above, but
    // we send a finalize() here, that's OK. It validates the log before
    // finalizing. Hence, even if it is not "in sync", it won't incorrectly
    // finalize.
    QuorumCall<AsyncLogger, Void> finalize =
        loggers.finalizeLogSegment(logToSync.getStartTxId(), logToSync.getEndTxId());
    loggers.waitForWriteQuorum(finalize, finalizeSegmentTimeoutMs,
        String.format("finalizeLogSegment(%s-%s)",
            logToSync.getStartTxId(),
            logToSync.getEndTxId()));
  }
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      LOG.info("Edit log file " + elf + " appears to be empty. " +
          "Moving it aside...");
      elf.moveAsideEmptyFile();
      return null;
    }
    SegmentStateProto ret = SegmentStateProto.newBuilder()
        .setStartTxId(segmentTxId)
        .setEndTxId(elf.getLastTxId())
        .setIsInProgress(elf.isInProgress())
        .build();
    LOG.info("getSegmentInfo(" + segmentTxId + "): " + elf + " -> " +
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        PrepareRecoveryResponseProto.newBuilder();

    PersistedRecoveryPaxosData previouslyAccepted = getPersistedPaxosData(segmentTxId);
    completeHalfDoneAcceptRecovery(previouslyAccepted);

    SegmentStateProto segInfo = getSegmentInfo(segmentTxId);
    boolean hasFinalizedSegment = segInfo != null && !segInfo.getIsInProgress();

    if (previouslyAccepted != null && !hasFinalizedSegment) {
      SegmentStateProto acceptedState = previouslyAccepted.getSegmentState();
      assert acceptedState.getEndTxId() == segInfo.getEndTxId() :
            "prev accepted: " + TextFormat.shortDebugString(previouslyAccepted)+ "\n" +
            "on disk:       " + TextFormat.shortDebugString(segInfo);
           
      builder.setAcceptedInEpoch(previouslyAccepted.getAcceptedInEpoch())
        .setSegmentState(previouslyAccepted.getSegmentState());
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          oldData, newData);
    }
   
    File syncedFile = null;
   
    SegmentStateProto currentSegment = getSegmentInfo(segmentTxId);
    if (currentSegment == null ||
        currentSegment.getEndTxId() != segment.getEndTxId()) {
      if (currentSegment == null) {
        LOG.info("Synchronizing log " + TextFormat.shortDebugString(segment) +
            ": no current segment in place");
       
        // Update the highest txid for lag metrics
        highestWrittenTxId = Math.max(segment.getEndTxId(),
            highestWrittenTxId);
      } else {
        LOG.info("Synchronizing log " + TextFormat.shortDebugString(segment) +
            ": old segment " + TextFormat.shortDebugString(currentSegment) +
            " is not the right length");
       
        // Paranoid sanity check: if the new log is shorter than the log we
        // currently have, we should not end up discarding any transactions
        // which are already Committed.
        if (txnRange(currentSegment).contains(committedTxnId.get()) &&
            !txnRange(segment).contains(committedTxnId.get())) {
          throw new AssertionError(
              "Cannot replace segment " +
              TextFormat.shortDebugString(currentSegment) +
              " with new segment " +
              TextFormat.shortDebugString(segment) +
              ": would discard already-committed txn " +
              committedTxnId.get());
        }
       
        // Another paranoid check: we should not be asked to synchronize a log
        // on top of a finalized segment.
        alwaysAssert(currentSegment.getIsInProgress(),
            "Should never be asked to synchronize a different log on top of an " +
            "already-finalized segment");
       
        // If we're shortening the log, update our highest txid
        // used for lag metrics.
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      LOG.info("Edit log file " + elf + " appears to be empty. " +
          "Moving it aside...");
      elf.moveAsideEmptyFile();
      return null;
    }
    SegmentStateProto ret = SegmentStateProto.newBuilder()
        .setStartTxId(segmentTxId)
        .setEndTxId(elf.getLastTxId())
        .setIsInProgress(elf.isInProgress())
        .build();
    LOG.info("getSegmentInfo(" + segmentTxId + "): " + elf + " -> " +
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        PrepareRecoveryResponseProto.newBuilder();

    PersistedRecoveryPaxosData previouslyAccepted = getPersistedPaxosData(segmentTxId);
    completeHalfDoneAcceptRecovery(previouslyAccepted);

    SegmentStateProto segInfo = getSegmentInfo(segmentTxId);
    boolean hasFinalizedSegment = segInfo != null && !segInfo.getIsInProgress();

    if (previouslyAccepted != null && !hasFinalizedSegment) {
      SegmentStateProto acceptedState = previouslyAccepted.getSegmentState();
      assert acceptedState.getEndTxId() == segInfo.getEndTxId() :
            "prev accepted: " + TextFormat.shortDebugString(previouslyAccepted)+ "\n" +
            "on disk:       " + TextFormat.shortDebugString(segInfo);
           
      builder.setAcceptedInEpoch(previouslyAccepted.getAcceptedInEpoch())
        .setSegmentState(previouslyAccepted.getSegmentState());
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          oldData, newData);
    }
   
    File syncedFile = null;
   
    SegmentStateProto currentSegment = getSegmentInfo(segmentTxId);
    if (currentSegment == null ||
        currentSegment.getEndTxId() != segment.getEndTxId()) {
      if (currentSegment == null) {
        LOG.info("Synchronizing log " + TextFormat.shortDebugString(segment) +
            ": no current segment in place");
       
        // Update the highest txid for lag metrics
        highestWrittenTxId = Math.max(segment.getEndTxId(),
            highestWrittenTxId);
      } else {
        LOG.info("Synchronizing log " + TextFormat.shortDebugString(segment) +
            ": old segment " + TextFormat.shortDebugString(currentSegment) +
            " is not the right length");
       
        // Paranoid sanity check: if the new log is shorter than the log we
        // currently have, we should not end up discarding any transactions
        // which are already Committed.
        if (txnRange(currentSegment).contains(committedTxnId.get()) &&
            !txnRange(segment).contains(committedTxnId.get())) {
          throw new AssertionError(
              "Cannot replace segment " +
              TextFormat.shortDebugString(currentSegment) +
              " with new segment " +
              TextFormat.shortDebugString(segment) +
              ": would discard already-committed txn " +
              committedTxnId.get());
        }
       
        // Another paranoid check: we should not be asked to synchronize a log
        // on top of a finalized segment.
        alwaysAssert(currentSegment.getIsInProgress(),
            "Should never be asked to synchronize a different log on top of an " +
            "already-finalized segment");
       
        // If we're shortening the log, update our highest txid
        // used for lag metrics.
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      LOG.info("None of the responders had a log to recover: " +
          QuorumCall.mapToString(prepareResponses));
      return;
    }
   
    SegmentStateProto logToSync = bestResponse.getSegmentState();
    assert segmentTxId == logToSync.getStartTxId();
   
    // Sanity check: none of the loggers should be aware of a higher
    // txid than the txid we intend to truncate to
    for (Map.Entry<AsyncLogger, PrepareRecoveryResponseProto> e :
         prepareResponses.entrySet()) {
      AsyncLogger logger = e.getKey();
      PrepareRecoveryResponseProto resp = e.getValue();

      if (resp.hasLastCommittedTxId() &&
          resp.getLastCommittedTxId() > logToSync.getEndTxId()) {
        throw new AssertionError("Decided to synchronize log to " + logToSync +
            " but logger " + logger + " had seen txid " +
            resp.getLastCommittedTxId() + " committed");
      }
    }
   
    URL syncFromUrl = bestLogger.buildURLToFetchLogs(segmentTxId);
   
    QuorumCall<AsyncLogger,Void> accept = loggers.acceptRecovery(logToSync, syncFromUrl);
    loggers.waitForWriteQuorum(accept, acceptRecoveryTimeoutMs,
        "acceptRecovery(" + TextFormat.shortDebugString(logToSync) + ")");

    // If one of the loggers above missed the synchronization step above, but
    // we send a finalize() here, that's OK. It validates the log before
    // finalizing. Hence, even if it is not "in sync", it won't incorrectly
    // finalize.
    QuorumCall<AsyncLogger, Void> finalize =
        loggers.finalizeLogSegment(logToSync.getStartTxId(), logToSync.getEndTxId());
    loggers.waitForWriteQuorum(finalize, finalizeSegmentTimeoutMs,
        String.format("finalizeLogSegment(%s-%s)",
            logToSync.getStartTxId(),
            logToSync.getEndTxId()));
  }
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      LOG.info("Edit log file " + elf + " appears to be empty. " +
          "Moving it aside...");
      elf.moveAsideEmptyFile();
      return null;
    }
    SegmentStateProto ret = SegmentStateProto.newBuilder()
        .setStartTxId(segmentTxId)
        .setEndTxId(elf.getLastTxId())
        .setIsInProgress(elf.isInProgress())
        .build();
    LOG.info("getSegmentInfo(" + segmentTxId + "): " + elf + " -> " +
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Related Classes of org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos.SegmentStateProto

  • org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager
  • org.apache.hadoop.hdfs.qjournal.client.SegmentRecoveryComparator
  • org.apache.hadoop.hdfs.qjournal.client.TestSegmentRecoveryComparator
  • org.apache.hadoop.hdfs.qjournal.server.Journal
  • org.apache.hadoop.hdfs.qjournal.server.TestJournal
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