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Ruslan Dautkhanov commented on HDFS-11851: ------------------------------------------ [~jzhuge], yes I did {{export CLASSPATH=`hadoop classpath`}} before so {{CLASSPATH}} does have all required jars including {{hadoop-common.jar}} I think some elements of that hs_err..log file are misleading as it shows internal events including when the classes were discovered, for example, {noformat} Event: 0.067 Thread 0x0000000000e00000 Exception <a 'java/lang/NoClassDefFoundError': org/apache/hadoop/fs/FileSystem> (0x0000000580169ab0) thrown at [/HUDSON3/workspace/8-2-build-linux-amd64/jdk8u141/9370/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 199] Event: 0.067 Thread 0x0000000000e00000 Exception <a 'java/lang/NoClassDefFoundError': org/apache/commons/lang/exception/ExceptionUtils> (0x000000058016c1f0) thrown at [/HUDSON3/workspace/8-2-build-linux-amd64/jdk8u141/9370/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 199] Event: 0.068 Thread 0x0000000000e00000 Exception <a 'java/lang/NoClassDefFoundError': org/apache/commons/lang/exception/ExceptionUtils> (0x000000058016e708) thrown at [/HUDSON3/workspace/8-2-build-linux-amd64/jdk8u141/9370/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 199] {noformat} but then right down below you see {noformat} Event: 0.066 loading class java/io/FileNotFoundException Event: 0.066 loading class java/io/IOException Event: 0.066 loading class java/io/IOException done Event: 0.066 loading class java/io/FileNotFoundException done Event: 0.066 loading class java/security/PrivilegedActionException Event: 0.066 loading class java/security/PrivilegedActionException done Event: 0.067 loading class org/apache/commons/lang/exception/ExceptionUtils Event: 0.067 loading class org/apache/commons/lang/exception/ExceptionUtils done Event: 0.067 loading class org/apache/commons/lang/exception/ExceptionUtils Event: 0.067 loading class org/apache/commons/lang/exception/ExceptionUtils done {noformat} Notice {{org/apache/commons/lang/exception/ExceptionUtils}} for example list twice in that "Internal exceptions (10 events)" section, but then shown as loaded fine in "Events (10 events)" section. So I think "Internal exceptions" is misleading? > getGlobalJNIEnv() may deadlock if exception is thrown > ----------------------------------------------------- > > Key: HDFS-11851 > URL: https://issues.apache.org/jira/browse/HDFS-11851 > Project: Hadoop HDFS > Issue Type: Bug > Components: libhdfs > Affects Versions: 3.0.0-alpha4 > Reporter: Henry Robinson > Assignee: Sailesh Mukil > Priority: Blocker > Fix For: 3.0.0-alpha4 > > Attachments: HDFS-11851.000.patch, HDFS-11851.001.patch, > HDFS-11851.002.patch, HDFS-11851.003.patch, HDFS-11851.004.patch, > HDFS-11851.005.patch > > > HDFS-11529 introduced a deadlock into {{getGlobalJNIEnv()}} if an exception > is thrown. {{getGlobalJNIEnv()}} holds {{jvmMutex}}, but > {{printExceptionAndFree()}} will eventually try to acquire that lock in > {{setTLSExceptionStrings()}}. > The exception might get caught from {{loadFileSystems}}: > {code} > jthr = invokeMethod(env, NULL, STATIC, NULL, > "org/apache/hadoop/fs/FileSystem", > "loadFileSystems", "()V"); > if (jthr) { > printExceptionAndFree(env, jthr, PRINT_EXC_ALL, > "loadFileSystems"); > } > } > {code} > and here's the relevant parts of the stack trace from where I call this API > in Impala, which uses {{libhdfs}}: > {code} > #0 __lll_lock_wait () at > ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135 > #1 0x00007ffff4a8d657 in _L_lock_909 () from > /lib/x86_64-linux-gnu/libpthread.so.0 > #2 0x00007ffff4a8d480 in __GI___pthread_mutex_lock (mutex=0x47ce960 > <jvmMutex>) at ../nptl/pthread_mutex_lock.c:79 > #3 0x0000000002f06056 in mutexLock (m=<optimized out>) at > /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/os/posix/mutexes.c:28 > #4 0x0000000002efe817 in setTLSExceptionStrings (rootCause=0x0, > stackTrace=0x0) at > /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c:581 > #5 0x0000000002f065d7 in printExceptionAndFreeV (env=0x513c1e8, > exc=0x508a8c0, noPrintFlags=<optimized out>, fmt=0x34349cf "loadFileSystems", > ap=0x7fffffffb660) > at > /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.c:183 > #6 0x0000000002f0683d in printExceptionAndFree (env=<optimized out>, > exc=<optimized out>, noPrintFlags=<optimized out>, fmt=<optimized out>) > at > /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.c:213 > #7 0x0000000002eff60f in getGlobalJNIEnv () at > /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c:463 > {code} -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org