Hmm, could you try in spark local mode? i.e. https://jaceklaskowski. gitbooks.io/mastering-apache-spark/content/spark-local.html
Mike On Tue, Mar 6, 2018 at 7:14 PM, Ravi Kanth <ravikanth....@gmail.com> wrote: > Mike, > > Can you clarify a bit on grabbing the jstack for the process? I launched > my Spark application and tried to get the pid using which I thought I can > grab jstack trace during hang. Unfortunately, I am not able to figure out > grabbing pid for Spark application. > > Thanks, > Ravi > > On 6 March 2018 at 18:36, Mike Percy <mpe...@apache.org> wrote: > >> Thanks Ravi. Would you mind attaching the output of jstack on the process >> during this hang? That would show what the Kudu client threads are doing, >> as what we are seeing here is just the netty boss thread. >> >> Mike >> >> On Tue, Mar 6, 2018 at 8:52 AM, Ravi Kanth <ravikanth....@gmail.com> >> wrote: >> >>> >>> Yes, I have debugged to find the root cause. Every logger before "table >>> = client.openTable(tableName);" is executing fine and exactly at the >>> point of opening the table, it is throwing the below exception and nothing >>> is being executed after that. Still the Spark batches are being processed >>> and at opening the table is failing. I tried catching it with no luck. >>> Please find below the exception. >>> >>> 8/02/23 00:16:30 ERROR client.TabletClient: [Peer >>> bd91f34d456a4eccaae50003c90f0fb2] Unexpected exception from downstream >>> on [id: 0x6e13b01f] >>> java.net.ConnectException: Connection refused: >>> kudu102.dev.sac.int.threatmetrix.com/10.112.3.12:7050 >>> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) >>> at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl >>> .java:717) >>> at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket >>> .nio.NioClientBoss.connect(NioClientBoss.java:152) >>> at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket >>> .nio.NioClientBoss.processSelectedKeys(NioClientBoss.java:105) >>> at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket >>> .nio.NioClientBoss.process(NioClientBoss.java:79) >>> at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket >>> .nio.AbstractNioSelector.run(AbstractNioSelector.java:337) >>> at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket >>> .nio.NioClientBoss.run(NioClientBoss.java:42) >>> at org.apache.kudu.client.shaded.org.jboss.netty.util.ThreadRen >>> amingRunnable.run(ThreadRenamingRunnable.java:108) >>> at org.apache.kudu.client.shaded.org.jboss.netty.util.internal. >>> DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) >>> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPool >>> Executor.java:1142) >>> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoo >>> lExecutor.java:617) >>> at java.lang.Thread.run(Thread.java:745) >>> >>> >>> Thanks, >>> Ravi >>> >>> On 5 March 2018 at 23:52, Mike Percy <mpe...@apache.org> wrote: >>> >>>> Have you considered checking your session error count or pending errors >>>> in your while loop every so often? Can you identify where your code is >>>> hanging when the connection is lost (what line)? >>>> >>>> Mike >>>> >>>> On Mon, Mar 5, 2018 at 9:08 PM, Ravi Kanth <ravikanth....@gmail.com> >>>> wrote: >>>> >>>>> In addition to my previous comment, I raised a support ticket for this >>>>> issue with Cloudera and one of the support person mentioned below, >>>>> >>>>> *"Thank you for clarifying, The exceptions are logged but not >>>>> re-thrown to an upper layer, so that explains why the Spark application is >>>>> not aware of the underlying error."* >>>>> >>>>> On 5 March 2018 at 21:02, Ravi Kanth <ravikanth....@gmail.com> wrote: >>>>> >>>>>> Mike, >>>>>> >>>>>> Thanks for the information. But, once the connection to any of the >>>>>> Kudu servers is lost then there is no way I can have a control on the >>>>>> KuduSession object and so with getPendingErrors(). The KuduClient in this >>>>>> case is becoming a zombie and never returned back till the connection is >>>>>> properly established. I tried doing all that you have suggested with no >>>>>> luck. Attaching my KuduClient code. >>>>>> >>>>>> package org.dwh.streaming.kudu.sparkkudustreaming; >>>>>> >>>>>> import java.util.HashMap; >>>>>> import java.util.Iterator; >>>>>> import java.util.Map; >>>>>> import org.apache.hadoop.util.ShutdownHookManager; >>>>>> import org.apache.kudu.client.*; >>>>>> import org.apache.spark.api.java.JavaRDD; >>>>>> import org.slf4j.Logger; >>>>>> import org.slf4j.LoggerFactory; >>>>>> import org.dwh.streaming.kudu.sparkkudustreaming.constants.SpecialN >>>>>> ullConstants; >>>>>> >>>>>> public class KuduProcess { >>>>>> private static Logger logger = LoggerFactory.getLogger(KuduPr >>>>>> ocess.class); >>>>>> private KuduTable table; >>>>>> private KuduSession session; >>>>>> >>>>>> public static void upsertKudu(JavaRDD<Map<String, Object>> rdd, >>>>>> String host, String tableName) { >>>>>> rdd.foreachPartition(iterator -> { >>>>>> RowErrorsAndOverflowStatus errors = upsertOpIterator(iterator, >>>>>> tableName, host); >>>>>> int errorCount = errors.getRowErrors().length; >>>>>> if(errorCount > 0){ >>>>>> throw new RuntimeException("Failed to write " + errorCount + " >>>>>> messages into Kudu"); >>>>>> } >>>>>> }); >>>>>> } >>>>>> private static RowErrorsAndOverflowStatus >>>>>> upsertOpIterator(Iterator<Map<String, Object>> iter, String >>>>>> tableName, String host) { >>>>>> try { >>>>>> AsyncKuduClient asyncClient = KuduConnection.getAsyncClient(host); >>>>>> KuduClient client = asyncClient.syncClient(); >>>>>> table = client.openTable(tableName); >>>>>> session = client.newSession(); >>>>>> session.setFlushMode(SessionConfiguration.FlushMode.AUTO_FLU >>>>>> SH_BACKGROUND); >>>>>> while (iter.hasNext()) { >>>>>> upsertOp(iter.next()); >>>>>> } >>>>>> } catch (KuduException e) { >>>>>> logger.error("Exception in upsertOpIterator method", e); >>>>>> } >>>>>> finally{ >>>>>> try { >>>>>> session.close(); >>>>>> } catch (KuduException e) { >>>>>> logger.error("Exception in Connection close", e); >>>>>> } >>>>>> } >>>>>> return session.getPendingErrors(); ---------------------> >>>>>> Once, the connection is lost, this part of the code never gets called and >>>>>> the Spark job will keep on running and processing the records while >>>>>> the KuduClient is trying to connect to Kudu. Meanwhile, we are loosing >>>>>> all >>>>>> the records. >>>>>> } >>>>>> public static void upsertOp(Map<String, Object> formattedMap) { >>>>>> if (formattedMap.size() != 0) { >>>>>> try { >>>>>> Upsert upsert = table.newUpsert(); >>>>>> PartialRow row = upsert.getRow(); >>>>>> for (Map.Entry<String, Object> entry : formattedMap.entrySet()) { >>>>>> if (entry.getValue().getClass().equals(String.class)) { >>>>>> if (entry.getValue().equals(SpecialNullConstants.specialStringNull)) >>>>>> row.setNull(entry.getKey()); >>>>>> else >>>>>> row.addString(entry.getKey(), (String) entry.getValue()); >>>>>> } else if (entry.getValue().getClass().equals(Long.class)) { >>>>>> if (entry.getValue().equals(SpecialNullConstants.specialLongNull)) >>>>>> row.setNull(entry.getKey()); >>>>>> else >>>>>> row.addLong(entry.getKey(), (Long) entry.getValue()); >>>>>> } else if (entry.getValue().getClass().equals(Integer.class)) { >>>>>> if (entry.getValue().equals(SpecialNullConstants.specialIntNull)) >>>>>> row.setNull(entry.getKey()); >>>>>> else >>>>>> row.addInt(entry.getKey(), (Integer) entry.getValue()); >>>>>> } >>>>>> } >>>>>> >>>>>> session.apply(upsert); >>>>>> } catch (Exception e) { >>>>>> logger.error("Exception during upsert:", e); >>>>>> } >>>>>> } >>>>>> } >>>>>> } >>>>>> class KuduConnection { >>>>>> private static Logger logger = LoggerFactory.getLogger(KuduCo >>>>>> nnection.class); >>>>>> private static Map<String, AsyncKuduClient> asyncCache = new >>>>>> HashMap<>(); >>>>>> private static int ShutdownHookPriority = 100; >>>>>> >>>>>> static AsyncKuduClient getAsyncClient(String kuduMaster) { >>>>>> if (!asyncCache.containsKey(kuduMaster)) { >>>>>> AsyncKuduClient asyncClient = new AsyncKuduClient.AsyncKuduClien >>>>>> tBuilder(kuduMaster).build(); >>>>>> ShutdownHookManager.get().addShutdownHook(new Runnable() { >>>>>> @Override >>>>>> public void run() { >>>>>> try { >>>>>> asyncClient.close(); >>>>>> } catch (Exception e) { >>>>>> logger.error("Exception closing async client", e); >>>>>> } >>>>>> } >>>>>> }, ShutdownHookPriority); >>>>>> asyncCache.put(kuduMaster, asyncClient); >>>>>> } >>>>>> return asyncCache.get(kuduMaster); >>>>>> } >>>>>> } >>>>>> >>>>>> >>>>>> >>>>>> Thanks, >>>>>> Ravi >>>>>> >>>>>> On 5 March 2018 at 16:20, Mike Percy <mpe...@apache.org> wrote: >>>>>> >>>>>>> Hi Ravi, it would be helpful if you could attach what you are >>>>>>> getting back from getPendingErrors() -- perhaps from dumping >>>>>>> RowError.toString() from items in the returned array -- and indicate >>>>>>> what >>>>>>> you were hoping to get back. Note that a RowError can also return to you >>>>>>> the Operation >>>>>>> <https://kudu.apache.org/releases/1.6.0/apidocs/org/apache/kudu/client/RowError.html#getOperation--> >>>>>>> that you used to generate the write. From the Operation, you can get the >>>>>>> original PartialRow >>>>>>> <https://kudu.apache.org/releases/1.6.0/apidocs/org/apache/kudu/client/PartialRow.html> >>>>>>> object, which should be able to identify the affected row that the write >>>>>>> failed for. Does that help? >>>>>>> >>>>>>> Since you are using the Kudu client directly, Spark is not involved >>>>>>> from the Kudu perspective, so you will need to deal with Spark on your >>>>>>> own >>>>>>> in that case. >>>>>>> >>>>>>> Mike >>>>>>> >>>>>>> On Mon, Mar 5, 2018 at 1:59 PM, Ravi Kanth <ravikanth....@gmail.com> >>>>>>> wrote: >>>>>>> >>>>>>>> Hi Mike, >>>>>>>> >>>>>>>> Thanks for the reply. Yes, I am using AUTO_FLUSH_BACKGROUND. >>>>>>>> >>>>>>>> So, I am trying to use Kudu Client API to perform UPSERT into Kudu >>>>>>>> and I integrated this with Spark. I am trying to test a case where in >>>>>>>> if >>>>>>>> any of Kudu server fails. So, in this case, if there is any problem in >>>>>>>> writing, getPendingErrors() should give me a way to handle these >>>>>>>> errors so >>>>>>>> that I can successfully terminate my Spark Job. This is what I am >>>>>>>> trying to >>>>>>>> do. >>>>>>>> >>>>>>>> But, I am not able to get a hold of the exceptions being thrown >>>>>>>> from with in the KuduClient when retrying to connect to Tablet Server. >>>>>>>> My >>>>>>>> getPendingErrors is not getting ahold of these exceptions. >>>>>>>> >>>>>>>> Let me know if you need more clarification. I can post some >>>>>>>> Snippets. >>>>>>>> >>>>>>>> Thanks, >>>>>>>> Ravi >>>>>>>> >>>>>>>> On 5 March 2018 at 13:18, Mike Percy <mpe...@apache.org> wrote: >>>>>>>> >>>>>>>>> Hi Ravi, are you using AUTO_FLUSH_BACKGROUND >>>>>>>>> <https://kudu.apache.org/releases/1.6.0/apidocs/org/apache/kudu/client/SessionConfiguration.FlushMode.html>? >>>>>>>>> You mention that you are trying to use getPendingErrors() >>>>>>>>> <https://kudu.apache.org/releases/1.6.0/apidocs/org/apache/kudu/client/KuduSession.html#getPendingErrors--> >>>>>>>>> but >>>>>>>>> it sounds like it's not working for you -- can you be more specific >>>>>>>>> about >>>>>>>>> what you expect and what you are observing? >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> Mike >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Feb 26, 2018 at 8:04 PM, Ravi Kanth < >>>>>>>>> ravikanth....@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> Thank Clifford. We are running Kudu 1.4 version. Till date we >>>>>>>>>> didn't see any issues in production and we are not losing tablet >>>>>>>>>> servers. >>>>>>>>>> But, as part of testing I have to generate few unforeseen cases to >>>>>>>>>> analyse >>>>>>>>>> the application performance. One among that is bringing down the >>>>>>>>>> tablet >>>>>>>>>> server or master server intentionally during which I observed the >>>>>>>>>> loss of >>>>>>>>>> records. Just wanted to test cases out of the happy path here. Once >>>>>>>>>> again >>>>>>>>>> thanks for taking time to respond to me. >>>>>>>>>> >>>>>>>>>> - Ravi >>>>>>>>>> >>>>>>>>>> On 26 February 2018 at 19:58, Clifford Resnick < >>>>>>>>>> cresn...@mediamath.com> wrote: >>>>>>>>>> >>>>>>>>>>> I'll have to get back to you on the code bits, but I'm pretty >>>>>>>>>>> sure we're doing simple sync batching. We're not in production yet, >>>>>>>>>>> but >>>>>>>>>>> after some months of development I haven't seen any failures, even >>>>>>>>>>> when >>>>>>>>>>> pushing load doing multiple years' backfill. I think the real >>>>>>>>>>> question is >>>>>>>>>>> why are you losing tablet servers? The only instability we ever had >>>>>>>>>>> with >>>>>>>>>>> Kudu was when it had that weird ntp sync issue that was fixed I >>>>>>>>>>> think for >>>>>>>>>>> 1.6. What version are you running? >>>>>>>>>>> >>>>>>>>>>> Anyway I would think that infinite loop should be catchable >>>>>>>>>>> somewhere. Our pipeline is set to fail/retry with Flink snapshots. I >>>>>>>>>>> imagine there is similar with Spark. Sorry I cant be of more help! >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Feb 26, 2018 9:10 PM, Ravi Kanth <ravikanth....@gmail.com> >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>> Cliff, >>>>>>>>>>> >>>>>>>>>>> Thanks for the response. Well, I do agree that its simple and >>>>>>>>>>> seamless. In my case, I am able to upsert ~25000 events/sec into >>>>>>>>>>> Kudu. But, >>>>>>>>>>> I am facing the problem when any of the Kudu Tablet or master >>>>>>>>>>> server is >>>>>>>>>>> down. I am not able to get a hold of the exception from client. The >>>>>>>>>>> client >>>>>>>>>>> is going into an infinite loop trying to connect to Kudu. >>>>>>>>>>> Meanwhile, I am >>>>>>>>>>> loosing my records. I tried handling the errors through >>>>>>>>>>> getPendingErrors() >>>>>>>>>>> but still it is helpless. I am using AsyncKuduClient to establish >>>>>>>>>>> the >>>>>>>>>>> connection and retrieving the syncClient from the Async to open the >>>>>>>>>>> session >>>>>>>>>>> and table. Any help? >>>>>>>>>>> >>>>>>>>>>> Thanks, >>>>>>>>>>> Ravi >>>>>>>>>>> >>>>>>>>>>> On 26 February 2018 at 18:00, Cliff Resnick <cre...@gmail.com> >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>> While I can't speak for Spark, we do use the client API from >>>>>>>>>>> Flink streaming and it's simple and seamless. It's especially nice >>>>>>>>>>> if you >>>>>>>>>>> require an Upsert semantic. >>>>>>>>>>> >>>>>>>>>>> On Feb 26, 2018 7:51 PM, "Ravi Kanth" <ravikanth....@gmail.com> >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>> Hi, >>>>>>>>>>> >>>>>>>>>>> Anyone using Spark Streaming to ingest data into Kudu and using >>>>>>>>>>> Kudu Client API to do so rather than the traditional KuduContext >>>>>>>>>>> API? I am >>>>>>>>>>> stuck at a point and couldn't find a solution. >>>>>>>>>>> >>>>>>>>>>> Thanks, >>>>>>>>>>> Ravi >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >