Gang Xie created HDFS-13121:
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Summary: NPE when request file descriptors when SC read
Key: HDFS-13121
URL: https://issues.apache.org/jira/browse/HDFS-13121
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Affects Versions: 3.0.0
Reporter: Gang Xie
Recently, we hit an issue that the DFSClient throws NPE. The case is that, the
app process exceeds the limit of the max open file. In the case, the libhadoop
never throw and exception but return null to the request of fds. But
requestFileDescriptors use the returned fds directly without any check and then
NPE.
We need add a sanity check here of null pointer.
private ShortCircuitReplicaInfo requestFileDescriptors(DomainPeer peer,
Slot slot) throws IOException {
ShortCircuitCache cache = clientContext.getShortCircuitCache();
final DataOutputStream out =
new DataOutputStream(new BufferedOutputStream(peer.getOutputStream()));
SlotId slotId = slot == null ? null : slot.getSlotId();
new Sender(out).requestShortCircuitFds(block, token, slotId, 1,
failureInjector.getSupportsReceiptVerification());
DataInputStream in = new DataInputStream(peer.getInputStream());
BlockOpResponseProto resp = BlockOpResponseProto.parseFrom(
PBHelperClient.vintPrefixed(in));
DomainSocket sock = peer.getDomainSocket();
failureInjector.injectRequestFileDescriptorsFailure();
switch (resp.getStatus()) {
case SUCCESS:
byte buf[] = new byte[1];
FileInputStream[] fis = new FileInputStream[2];
{color:#d04437}sock.recvFileInputStreams(fis, buf, 0, buf.length);{color}
ShortCircuitReplica replica = null;
try {
ExtendedBlockId key =
new ExtendedBlockId(block.getBlockId(), block.getBlockPoolId());
if (buf[0] == USE_RECEIPT_VERIFICATION.getNumber()) {
LOG.trace("Sending receipt verification byte for slot {}", slot);
sock.getOutputStream().write(0);
}
{color:#d04437}replica = new ShortCircuitReplica(key, fis[0], fis[1],
cache,{color}
{color:#d04437} Time.monotonicNow(), slot);{color}
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