Examples with ShortCircuitFdsUnsupportedException org.apache.hadoop.hdfs.server.datanode.DataNode.ShortCircuitFdsUnsupportedException used on opensource projects

Example 1 with ShortCircuitFdsUnsupportedException

use of org.apache.hadoop.hdfs.server.datanode.DataNode.ShortCircuitFdsUnsupportedException in project hadoop by apache.

the class DataXceiver method requestShortCircuitFds.

@Override
public void requestShortCircuitFds(final ExtendedBlock blk, final Token<BlockTokenIdentifier> token, SlotId slotId, int maxVersion, boolean supportsReceiptVerification) throws IOException {
    updateCurrentThreadName("Passing file descriptors for block " + blk);
    DataOutputStream out = getBufferedOutputStream();
    checkAccess(out, true, blk, token, Op.REQUEST_SHORT_CIRCUIT_FDS, BlockTokenIdentifier.AccessMode.READ);
    BlockOpResponseProto.Builder bld = BlockOpResponseProto.newBuilder();
    FileInputStream[] fis = null;
    SlotId registeredSlotId = null;
    boolean success = false;
    try {
        try {
            if (peer.getDomainSocket() == null) {
                throw new IOException("You cannot pass file descriptors over " + "anything but a UNIX domain socket.");
            }
            if (slotId != null) {
                boolean isCached = datanode.data.isCached(blk.getBlockPoolId(), blk.getBlockId());
                datanode.shortCircuitRegistry.registerSlot(ExtendedBlockId.fromExtendedBlock(blk), slotId, isCached);
                registeredSlotId = slotId;
            }
            fis = datanode.requestShortCircuitFdsForRead(blk, token, maxVersion);
            Preconditions.checkState(fis != null);
            bld.setStatus(SUCCESS);
            bld.setShortCircuitAccessVersion(DataNode.CURRENT_BLOCK_FORMAT_VERSION);
        } catch (ShortCircuitFdsVersionException e) {
            bld.setStatus(ERROR_UNSUPPORTED);
            bld.setShortCircuitAccessVersion(DataNode.CURRENT_BLOCK_FORMAT_VERSION);
            bld.setMessage(e.getMessage());
        } catch (ShortCircuitFdsUnsupportedException e) {
            bld.setStatus(ERROR_UNSUPPORTED);
            bld.setMessage(e.getMessage());
        } catch (IOException e) {
            bld.setStatus(ERROR);
            bld.setMessage(e.getMessage());
        }
        bld.build().writeDelimitedTo(socketOut);
        if (fis != null) {
            FileDescriptor[] fds = new FileDescriptor[fis.length];
            for (int i = 0; i < fds.length; i++) {
                fds[i] = fis[i].getFD();
            }
            byte[] buf = new byte[1];
            if (supportsReceiptVerification) {
                buf[0] = (byte) USE_RECEIPT_VERIFICATION.getNumber();
            } else {
                buf[0] = (byte) DO_NOT_USE_RECEIPT_VERIFICATION.getNumber();
            }
            DomainSocket sock = peer.getDomainSocket();
            sock.sendFileDescriptors(fds, buf, 0, buf.length);
            if (supportsReceiptVerification) {
                LOG.trace("Reading receipt verification byte for " + slotId);
                int val = sock.getInputStream().read();
                if (val < 0) {
                    throw new EOFException();
                }
            } else {
                LOG.trace("Receipt verification is not enabled on the DataNode.  " + "Not verifying " + slotId);
            }
            success = true;
        }
    } finally {
        if ((!success) && (registeredSlotId != null)) {
            LOG.info("Unregistering " + registeredSlotId + " because the " + "requestShortCircuitFdsForRead operation failed.");
            datanode.shortCircuitRegistry.unregisterSlot(registeredSlotId);
        }
        if (ClientTraceLog.isInfoEnabled()) {
            DatanodeRegistration dnR = datanode.getDNRegistrationForBP(blk.getBlockPoolId());
            BlockSender.ClientTraceLog.info(String.format("src: 127.0.0.1, dest: 127.0.0.1, op: REQUEST_SHORT_CIRCUIT_FDS," + " blockid: %s, srvID: %s, success: %b", blk.getBlockId(), dnR.getDatanodeUuid(), success));
        }
        if (fis != null) {
            IOUtils.cleanup(null, fis);
        }
    }
}