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From "Catalin Alexandru Zamfir (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8396) DataStreamer, OutOfMemoryError, unable to create new native thread
Date Fri, 11 May 2012 20:34:44 GMT
Catalin Alexandru Zamfir created HADOOP-8396:
------------------------------------------------

             Summary: DataStreamer, OutOfMemoryError, unable to create new native thread
                 Key: HADOOP-8396
                 URL: https://issues.apache.org/jira/browse/HADOOP-8396
             Project: Hadoop Common
          Issue Type: Bug
          Components: io
    Affects Versions: 1.0.2
         Environment: Ubuntu 64bit, 4GB of RAM, Core Duo processors, commodity hardware.
            Reporter: Catalin Alexandru Zamfir
            Priority: Blocker


We're trying to write about 1 few billion records, via "Avro". When we got this error, that's
unrelated to our code:

10725984 [Main] INFO net.gameloft.RnD.Hadoop.App - ## At: 2:58:43.290 # Written: 521000000
records
Exception in thread "DataStreamer for file /Streams/Cubed/Stuff/objGame/aRandomGame/objType/aRandomType/2012/05/11/20/29/Shard.avro
block blk_3254486396346586049_75838" java.lang.OutOfMemoryError: unable to create new native
thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:657)
        at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:612)
        at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184)
        at org.apache.hadoop.ipc.Client.getConnection(Client.java:1202)
        at org.apache.hadoop.ipc.Client.call(Client.java:1046)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)
        at $Proxy8.getProtocolVersion(Unknown Source)
        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)
        at org.apache.hadoop.hdfs.DFSClient.createClientDatanodeProtocolProxy(DFSClient.java:160)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.processDatanodeError(DFSClient.java:3117)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2200(DFSClient.java:2586)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2790)
10746169 [Main] INFO net.gameloft.RnD.Hadoop.App - ## At: 2:59:03.474 # Written: 522000000
records
Exception in thread "ResponseProcessor for block blk_4201760269657070412_73948" java.lang.OutOfMemoryError
        at sun.misc.Unsafe.allocateMemory(Native Method)
        at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:117)
        at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:305)
        at sun.nio.ch.Util.getTemporaryDirectBuffer(Util.java:75)
        at sun.nio.ch.IOUtil.read(IOUtil.java:223)
        at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:254)
        at org.apache.hadoop.net.SocketInputStream$Reader.performIO(SocketInputStream.java:55)
        at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:142)
        at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
        at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
        at java.io.DataInputStream.readFully(DataInputStream.java:195)
        at java.io.DataInputStream.readLong(DataInputStream.java:416)
        at org.apache.hadoop.hdfs.protocol.DataTransferProtocol$PipelineAck.readFields(DataTransferProtocol.java:124)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$ResponseProcessor.run(DFSClient.java:2964)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 32 bytes for intptr_t in /build/buildd/openjdk-6-6b23~pre11/build/openjdk/hotspot/src/share/vm/runtime/deoptimization.cpp
[thread 1587264368 also had an error]
[thread 1111309168 also had an error]
[thread 1820371824 also had an error]
[thread 1343454064 also had an error]
[thread 1345444720 also had an error]
# An error report file with more information is saved as:
# [thread 1345444720 also had an error]
[thread -1091290256 also had an error]
[thread 678165360 also had an error]
[thread 678497136 also had an error]
[thread 675511152 also had an error]
[thread 1385937776 also had an error]
[thread 911969136 also had an error]
[thread -1086207120 also had an error]
[thread -1088251024 also had an error]
[thread -1088914576 also had an error]
[thread -1086870672 also had an error]
[thread 441797488 also had an error][thread 445778800 also had an error]

[thread 440400752 also had an error]
[thread 444119920 also had an error][thread 1151298416 also had an error]

[thread 443124592 also had an error]
[thread 1152625520 also had an error]
[thread 913628016 also had an error]
[thread -1095345296 also had an error][thread 1390799728 also had an error]

[thread 443788144 also had an error]
[thread 676506480 also had an error]
[thread 1630595952 also had an error]
pure virtual method called
terminate called without an active exception
pure virtual method called
Aborted

It seems to be a memory leak. We were opening 5 - 10 buffers to different paths when writing
and closing them. We've tested that those buffers do not overrun. And they don't. But watching
the application continue writing, we saw that over a period of 5 to 6 hours, it kept constantly
increasing in memory, not by the average of 8MB buffer that we've set, but my small values.
I'm reading the code and it seems there's a memory leak somewhere, in the way Hadoop does
buffer allocation. While we specifically close the buffers if the count of open buffers is
above 5 (meaning 5 * 8MB per buffer) this bug still happens.

Can it be fixed? As you can see from the strack trace, it writes a "fan-out" path of the type
you see in the strack trace. We've let it execute till about 500M records, when this error
blew. It's a blocker as these writers need to be production-grade ready, while they're not
due to this native buffer allocation that when executing large amounts of writes, seems to
generate a memory leak.



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