Example usage for org.apache.hadoop.hdfs.server.protocol ReplicaRecoveryInfo getGenerationStamp

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs.server.protocol ReplicaRecoveryInfo getGenerationStamp.

Prototype

public long getGenerationStamp() 

Source Link

Usage

From source file:common.DataNode.java

License:Apache License

/** Recover a block */
private void recoverBlock(RecoveringBlock rBlock) throws IOException {
    Block block = rBlock.getBlock();/*from   ww  w.j  a va2 s.co m*/
    DatanodeInfo[] targets = rBlock.getLocations();
    DatanodeID[] datanodeids = (DatanodeID[]) targets;
    List<BlockRecord> syncList = new ArrayList<BlockRecord>(datanodeids.length);
    int errorCount = 0;

    //check generation stamps
    for (DatanodeID id : datanodeids) {
        try {
            InterDatanodeProtocol datanode = dnRegistration.equals(id) ? this
                    : DataNode.createInterDataNodeProtocolProxy(id, getConf());
            ReplicaRecoveryInfo info = callInitReplicaRecovery(datanode, rBlock);
            if (info != null && info.getGenerationStamp() >= block.getGenerationStamp()
                    && info.getNumBytes() > 0) {
                syncList.add(new BlockRecord(id, datanode, info));
            }
        } catch (RecoveryInProgressException ripE) {
            InterDatanodeProtocol.LOG.warn("Recovery for replica " + block + " on data-node " + id
                    + " is already in progress. Recovery id = " + rBlock.getNewGenerationStamp()
                    + " is aborted.", ripE);
            return;
        } catch (IOException e) {
            ++errorCount;
            InterDatanodeProtocol.LOG.warn(
                    "Failed to obtain replica info for block (=" + block + ") from datanode (=" + id + ")", e);
        }
    }

    if (errorCount == datanodeids.length) {
        throw new IOException(
                "All datanodes failed: block=" + block + ", datanodeids=" + Arrays.asList(datanodeids));
    }

    syncBlock(rBlock, syncList);
}

---