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Colin Patrick McCabe updated HDFS-6912: --------------------------------------- Attachment: HDFS-6912.001.patch > HDFS Short-circuit read implementation throws SIGBUS from misc.Unsafe usage > --------------------------------------------------------------------------- > > Key: HDFS-6912 > URL: https://issues.apache.org/jira/browse/HDFS-6912 > Project: Hadoop HDFS > Issue Type: Bug > Components: caching > Affects Versions: 2.5.0 > Environment: HDFS Data node, with 8 gb tmpfs in /dev/shm > Reporter: Gopal V > Attachments: HDFS-6912.001.patch > > > The short-circuit reader throws SIGBUS errors from Unsafe code and crashes > the JVM when tmpfs on a disk is depleted. > {code} > --------------- T H R E A D --------------- > Current thread (0x00007eff387df800): JavaThread "xxx" daemon [_thread_in_vm, > id=5880, stack(0x00007eff28b93000,0x00007eff28c94000)] > siginfo:si_signo=SIGBUS: si_errno=0, si_code=2 (BUS_ADRERR), > si_addr=0x00007eff3e51d000 > {code} > The entire backtrace of the JVM crash is > {code} > Stack: [0x00007eff28b93000,0x00007eff28c94000], sp=0x00007eff28c90a10, free > space=1014k > Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native > code) > V [libjvm.so+0x88232c] Unsafe_GetLongVolatile+0x6c > j sun.misc.Unsafe.getLongVolatile(Ljava/lang/Object;J)J+0 > j org.apache.hadoop.hdfs.ShortCircuitShm$Slot.setFlag(J)V+8 > j org.apache.hadoop.hdfs.ShortCircuitShm$Slot.makeValid()V+4 > j > org.apache.hadoop.hdfs.ShortCircuitShm.allocAndRegisterSlot(Lorg/apache/hadoop/hdfs/ExtendedBlockId;)Lorg/apache/hadoop/hdfs/ShortCircuitShm$Slot;+70 > j > org.apache.hadoop.hdfs.client.DfsClientShmManager$EndpointShmManager.allocSlotFromExistingShm(Lorg/apache/hadoop/hdfs/ExtendedBlockId;)Lorg/apache/hadoop/hdfs/ShortCircuitShm$Slot;+38 > j > org.apache.hadoop.hdfs.client.DfsClientShmManager$EndpointShmManager.allocSlot(Lorg/apache/hadoop/hdfs/net/DomainPeer;Lorg/apache/commons/lang/mutable/MutableBoolean;Ljava/lang/String;Lorg/apache/hadoop/hdfs/ExtendedBlockId;)Lorg/apache/hadoop/hdfs/ShortCircuitShm$Slot;+100 > j > org.apache.hadoop.hdfs.client.DfsClientShmManager.allocSlot(Lorg/apache/hadoop/hdfs/protocol/DatanodeInfo;Lorg/apache/hadoop/hdfs/net/DomainPeer;Lorg/apache/commons/lang/mutable/MutableBoolean;Lorg/apache/hadoop/hdfs/ExtendedBlockId;Ljava/lang/String;)Lorg/apache/hadoop/hdfs/ShortCircuitShm$Slot;+102 > j > org.apache.hadoop.hdfs.client.ShortCircuitCache.allocShmSlot(Lorg/apache/hadoop/hdfs/protocol/DatanodeInfo;Lorg/apache/hadoop/hdfs/net/DomainPeer;Lorg/apache/commons/lang/mutable/MutableBoolean;Lorg/apache/hadoop/hdfs/ExtendedBlockId;Ljava/lang/String;)Lorg/apache/hadoop/hdfs/ShortCircuitShm$Slot;+18 > j > org.apache.hadoop.hdfs.BlockReaderFactory.createShortCircuitReplicaInfo()Lorg/apache/hadoop/hdfs/client/ShortCircuitReplicaInfo;+151 > j > org.apache.hadoop.hdfs.client.ShortCircuitCache.create(Lorg/apache/hadoop/hdfs/ExtendedBlockId;Lorg/apache/hadoop/hdfs/client/ShortCircuitCache$ShortCircuitReplicaCreator;Lorg/apache/hadoop/util/Waitable;)Lorg/apache/hadoop/hdfs/client/ShortCircuitReplicaInfo;+46 > j > org.apache.hadoop.hdfs.client.ShortCircuitCache.fetchOrCreate(Lorg/apache/hadoop/hdfs/ExtendedBlockId;Lorg/apache/hadoop/hdfs/client/ShortCircuitCache$ShortCircuitReplicaCreator;)Lorg/apache/hadoop/hdfs/client/ShortCircuitReplicaInfo;+230 > j > org.apache.hadoop.hdfs.BlockReaderFactory.getBlockReaderLocal()Lorg/apache/hadoop/hdfs/BlockReader;+175 > j > org.apache.hadoop.hdfs.BlockReaderFactory.build()Lorg/apache/hadoop/hdfs/BlockReader;+87 > j > org.apache.hadoop.hdfs.DFSInputStream.blockSeekTo(J)Lorg/apache/hadoop/hdfs/protocol/DatanodeInfo;+291 > j > org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(Lorg/apache/hadoop/hdfs/DFSInputStream$ReaderStrategy;II)I+83 > j org.apache.hadoop.hdfs.DFSInputStream.read([BII)I+15 > {code} > This can be easily reproduced by starting the DataNode, filling up tmpfs (dd > if=/dev/zero bs=1M of=/dev/shm/dummy.zero) and running a simple task. -- This message was sent by Atlassian JIRA (v6.2#6252)