with default Sqoop connector, running into IO Error: Connection reset

When using the default Sqoop connector for Oracle, some data does get transferred, but during the map-reduce job, seeing lots of errors as below:

attempt_201105261333_0002_m_000001_0: log4j:WARN Not allowed to write to a closed appender.
11/05/26 16:23:47 INFO mapred.JobClient: Task Id : attempt_201105261333_0002_m_000002_0, Status : FAILED
java.lang.RuntimeException: java.lang.RuntimeException: java.sql.SQLRecoverableException: IO Error: Connection reset
at com.cloudera.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:164)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:62)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:605)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
at org.apache.hadoop.mapred.Child.main(Child.java:262)
Caused by: java.lang.RuntimeException: java.sql.SQLRecoverableException: IO Error: Connection reset
at com.cloudera.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:190)
at com.cloudera.sqoop.mapreduce.db.DBInputFormat.setConf(DBInputFormat.java:159)
... 9 more
Caused by: java.sql.SQLRecoverableException: IO Error: Connection reset
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:428)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:536)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:228)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:521)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at com.cloudera.sqoop.mapreduce.db.DBConfiguration.getConnection(DBConfiguration.java:152)
at com.cloudera.sqoop.mapreduce.db.DBInputFormat.getConnection(DBInputFormat.java:184)
... 10 more
Caused by: java.net.SocketException: Connection reset
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:96)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at oracle.net.ns.DataPacket.send(DataPacket.java:199)
at oracle.net.ns.NetOutputStream.flush(NetOutputStream.java:211)
at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:227)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:175)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:100)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:85)
at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:123)
at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:79)
at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1122)
at oracle.jdbc.driver.T4CMAREngine.unmarshalSB1(T4CMAREngine.java:1099)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:288)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:191)
at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:366)
at oracle.jdbc.driver.T4CTTIoauthenticate.doOAUTH(T4CTTIoauthenticate.java:752)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:366)
... 18 more

At the end:

11/05/26 16:27:51 INFO mapred.JobClient: Job complete: job_201105261333_0002
11/05/26 16:27:51 INFO mapred.JobClient: Counters: 13
11/05/26 16:27:51 INFO mapred.JobClient: Job Counters
11/05/26 16:27:51 INFO mapred.JobClient: SLOTS_MILLIS_MAPS=790364
11/05/26 16:27:51 INFO mapred.JobClient: Total time spent by all reduces waiting after reserving slots (ms)=0
11/05/26 16:27:51 INFO mapred.JobClient: Total time spent by all maps waiting after reserving slots (ms)=0
11/05/26 16:27:51 INFO mapred.JobClient: Launched map tasks=10
11/05/26 16:27:51 INFO mapred.JobClient: SLOTS_MILLIS_REDUCES=0
11/05/26 16:27:51 INFO mapred.JobClient: Failed map tasks=1
11/05/26 16:27:51 INFO mapred.JobClient: FileSystemCounters
11/05/26 16:27:51 INFO mapred.JobClient: HDFS_BYTES_READ=222
11/05/26 16:27:51 INFO mapred.JobClient: FILE_BYTES_WRITTEN=108922
11/05/26 16:27:51 INFO mapred.JobClient: HDFS_BYTES_WRITTEN=462
11/05/26 16:27:51 INFO mapred.JobClient: Map-Reduce Framework
11/05/26 16:27:51 INFO mapred.JobClient: Map input records=8
11/05/26 16:27:51 INFO mapred.JobClient: Spilled Records=0
11/05/26 16:27:51 INFO mapred.JobClient: Map output records=8
11/05/26 16:27:51 INFO mapred.JobClient: SPLIT_RAW_BYTES=222
11/05/26 16:27:51 INFO mapreduce.ImportJobBase: Transferred 462 bytes in 379.7796 seconds (1.2165 bytes/sec)
11/05/26 16:27:51 INFO mapreduce.ImportJobBase: Retrieved 8 records.
11/05/26 16:27:51 ERROR tool.ImportTool: Error during import: Import job failed!

As Paul Socha pointed out, the workaround is to change the setup for your application, by adding this parameter to the java command:

-Djava.security.egd=file:/dev/../dev/urandom

This should be documented in the Sqoop User Guide.