Example usage for org.apache.hadoop.ipc RemoteException unwrapRemoteException

Introduction

In this page you can find the example usage for org.apache.hadoop.ipc RemoteException unwrapRemoteException.

Prototype

public IOException unwrapRemoteException(Class<?>... lookupTypes) 

Source Link

Document

If this remote exception wraps up one of the lookupTypes then return this exception.

Usage

From source file:com.alibaba.wasp.EntityGroupMovedException.java

License:Apache License

/**
 * Look for a EntityGroupMovedException in the exception: - hadoop.ipc wrapped
 * exceptions - nested exceptions Returns null if we didn't find the exception
 * or if it was not readable.//from ww  w  .j av a  2s . c om
 */
public static EntityGroupMovedException find(Object exception) {
    if (exception == null || !(exception instanceof Throwable)) {
        return null;
    }

    Throwable cur = (Throwable) exception;
    EntityGroupMovedException res = null;

    while (res == null && cur != null) {
        if (cur instanceof EntityGroupMovedException) {
            res = (EntityGroupMovedException) cur;
        } else {
            if (cur instanceof RemoteException) {
                RemoteException re = (RemoteException) cur;
                Exception e = re.unwrapRemoteException(EntityGroupMovedException.class);
                if (e == null) {
                    e = re.unwrapRemoteException();
                }
                // unwrapRemoteException can return the exception given as a parameter
                // when it cannot
                // unwrap it. In this case, there is no need to look further
                // noinspection ObjectEquality
                if (e != re) {
                    res = find(e);
                }
            }
            cur = cur.getCause();
        }
    }

    if (res != null && (res.getPort() < 0 || res.getHostname() == null)) {
        // We failed to parse the exception. Let's act as we don't find the
        // exception.
        return null;
    } else {
        return res;
    }
}

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From source file:com.mellanox.r4h.DFSClient.java

License:Apache License

/**
 * Save namespace image./*  w w w.  j  a  v  a2s  . c  o  m*/
 * 
 * @see ClientProtocol#saveNamespace()
 */
void saveNamespace() throws AccessControlException, IOException {
    TraceScope scope = Trace.startSpan("saveNamespace", traceSampler);
    try {
        namenode.saveNamespace();
    } catch (RemoteException re) {
        throw re.unwrapRemoteException(AccessControlException.class);
    } finally {
        scope.close();
    }
}

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From source file:com.mellanox.r4h.DFSClient.java

License:Apache License

/**
 * Rolls the edit log on the active NameNode.
 * /*from   w  w  w  .  ja va 2s . c o m*/
 * @return the txid of the new log segment
 *
 * @see ClientProtocol#rollEdits()
 */
long rollEdits() throws AccessControlException, IOException {
    TraceScope scope = Trace.startSpan("rollEdits", traceSampler);
    try {
        return namenode.rollEdits();
    } catch (RemoteException re) {
        throw re.unwrapRemoteException(AccessControlException.class);
    } finally {
        scope.close();
    }
}

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