Examples with ShortCircuitReplicaInfo org.apache.hadoop.hdfs.shortcircuit.ShortCircuitReplicaInfo used on opensource projects

Example 6 with ShortCircuitReplicaInfo

use of org.apache.hadoop.hdfs.shortcircuit.ShortCircuitReplicaInfo in project hadoop by apache.

the class BlockReaderFactory method getBlockReaderLocal.

private BlockReader getBlockReaderLocal() throws InvalidToken {
    LOG.trace("{}: trying to construct a BlockReaderLocal for short-circuit " + " reads.", this);
    if (pathInfo == null) {
        pathInfo = clientContext.getDomainSocketFactory().getPathInfo(inetSocketAddress, conf.getShortCircuitConf());
    }
    if (!pathInfo.getPathState().getUsableForShortCircuit()) {
        PerformanceAdvisory.LOG.debug("{}: {} is not usable for short circuit; " + "giving up on BlockReaderLocal.", this, pathInfo);
        return null;
    }
    ShortCircuitCache cache = clientContext.getShortCircuitCache();
    ExtendedBlockId key = new ExtendedBlockId(block.getBlockId(), block.getBlockPoolId());
    ShortCircuitReplicaInfo info = cache.fetchOrCreate(key, this);
    InvalidToken exc = info.getInvalidTokenException();
    if (exc != null) {
        LOG.trace("{}: got InvalidToken exception while trying to construct " + "BlockReaderLocal via {}", this, pathInfo.getPath());
        throw exc;
    }
    if (info.getReplica() == null) {
        PerformanceAdvisory.LOG.debug("{}: failed to get " + "ShortCircuitReplica. Cannot construct " + "BlockReaderLocal via {}", this, pathInfo.getPath());
        return null;
    }
    return new BlockReaderLocal.Builder(conf.getShortCircuitConf()).setFilename(fileName).setBlock(block).setStartOffset(startOffset).setShortCircuitReplica(info.getReplica()).setVerifyChecksum(verifyChecksum).setCachingStrategy(cachingStrategy).setStorageType(storageType).setTracer(tracer).build();
}