用yarn cluster方式提交spark任务时，有时会报错，报错几率是40%，报错如下：

18/03/15 21:50:36 116 ERROR ApplicationMaster91: User class threw exception: org.apache.spark.sql.AnalysisException: java.lang.NoSuchFieldError: HIVE_MOVE_FILES_THREAD_COUNT;

org.apache.spark.sql.AnalysisException: java.lang.NoSuchFieldError: HIVE_MOVE_FILES_THREAD_COUNT;

at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:106)

at org.apache.spark.sql.hive.HiveExternalCatalog.loadTable(HiveExternalCatalog.scala:766)

at org.apache.spark.sql.hive.execution.InsertIntoHiveTable.sideEffectResult$lzycompute(InsertIntoHiveTable.scala:374)

at org.apache.spark.sql.hive.execution.InsertIntoHiveTable.sideEffectResult(InsertIntoHiveTable.scala:221)

at org.apache.spark.sql.hive.execution.InsertIntoHiveTable.doExecute(InsertIntoHiveTable.scala:407)

at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:114)

at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:114)

at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:135)

at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)

at org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:132)

at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:113)

at org.apache.spark.sql.execution.QueryExecution.toRdd$lzycompute(QueryExecution.scala:92)

at org.apache.spark.sql.execution.QueryExecution.toRdd(QueryExecution.scala:92)

at org.apache.spark.sql.Dataset.(Dataset.scala:185)

at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:64)

at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:592)

at scala.util.control.Breaks.breakable(Breaks.scala:38)

at app.package.APPClass$.main(APPClass.scala:177)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:637)

Caused by: java.lang.NoSuchFieldError: HIVE_MOVE_FILES_THREAD_COUNT

at org.apache.hadoop.hive.ql.metadata.Hive.trashFilesUnderDir(Hive.java:1389)

at org.apache.hadoop.hive.ql.metadata.Hive.replaceFiles(Hive.java:2873)

at org.apache.hadoop.hive.ql.metadata.Hive.loadTable(Hive.java:1621)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.apache.spark.sql.hive.client.Shim_v0_14.loadTable(HiveShim.scala:728)

at org.apache.spark.sql.hive.client.HiveClientImpl$$anonfun$loadTable$1.apply$mcV$sp(HiveClientImpl.scala:676)

at org.apache.spark.sql.hive.client.HiveClientImpl$$anonfun$loadTable$1.apply(HiveClientImpl.scala:676)

at org.apache.spark.sql.hive.client.HiveClientImpl$$anonfun$loadTable$1.apply(HiveClientImpl.scala:676)

at org.apache.spark.sql.hive.client.HiveClientImpl$$anonfun$withHiveState$1.apply(HiveClientImpl.scala:279)

at org.apache.spark.sql.hive.client.HiveClientImpl.liftedTree1$1(HiveClientImpl.scala:226)

at org.apache.spark.sql.hive.client.HiveClientImpl.retryLocked(HiveClientImpl.scala:225)

at org.apache.spark.sql.hive.client.HiveClientImpl.withHiveState(HiveClientImpl.scala:268)

at org.apache.spark.sql.hive.client.HiveClientImpl.loadTable(HiveClientImpl.scala:675)

at org.apache.spark.sql.hive.HiveExternalCatalog$$anonfun$loadTable$1.apply$mcV$sp(HiveExternalCatalog.scala:768)

at org.apache.spark.sql.hive.HiveExternalCatalog$$anonfun$loadTable$1.apply(HiveExternalCatalog.scala:766)

at org.apache.spark.sql.hive.HiveExternalCatalog$$anonfun$loadTable$1.apply(HiveExternalCatalog.scala:766)

at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:97)

... 25 more

大概流程是spark sql在执行InsertIntoHiveTable时会调用loadTable，这个操作最终会通过反射调用hive代码的loadTable方法

1 org.apache.spark.sql.hive.execution.InsertIntoHiveTable.doExecute(InsertIntoHiveTable.scala:407)

2 org.apache.spark.sql.hive.HiveExternalCatalog.loadTable(HiveExternalCatalog.scala:766)

3 org.apache.spark.sql.hive.client.Shim_v0_14.loadTable(HiveShim.scala:728)

4 java.lang.reflect.Method.invoke(Method.java:497)

5 org.apache.hadoop.hive.ql.metadata.Hive.loadTable(Hive.java:1621)

6 org.apache.hadoop.hive.ql.metadata.Hive.trashFilesUnderDir(Hive.java:1389)

在第6步中报错 java.lang.NoSuchFieldError: HIVE_MOVE_FILES_THREAD_COUNT

这个问题通常会认为是hive-site.xml缺少配置

hive.mv.files.thread

15

但是查看代码会发现spark2.1.1依赖的是hive1.2.1，在hive1.2.1中是没有hive.mv.files.thread这个配置的，这个配置从hive2才开始出现，而且报错的类org.apache.hadoop.hive.ql.metadata.Hive在hive1.2.1和hive2的相关代码完全不同，

在hive1.2.1的代码是：(trashFilesUnderDir方法是FileUtils类的)

if (FileUtils.isSubDir(oldPath, destf, fs2)) {

FileUtils.trashFilesUnderDir(fs2, oldPath, conf);

}

在hive2的代码是：(trashFilesUnderDir方法是Hive类的)

private boolean trashFilesUnderDir(final FileSystem fs, Path f, final Configuration conf)

throws IOException {

FileStatus[] statuses = fs.listStatus(f, FileUtils.HIDDEN_FILES_PATH_FILTER);

boolean result = true;

final List> futures = new LinkedList<>();

final ExecutorService pool = conf.getInt(ConfVars.HIVE_MOVE_FILES_THREAD_COUNT.varname, 25) > 0 ?

Executors.newFixedThreadPool(conf.getInt(ConfVars.HIVE_MOVE_FILES_THREAD_COUNT.varname, 25),

new ThreadFactoryBuilder().setDaemon(true).setNameFormat("Delete-Thread-%d").build()) : null;

所以第6步的报错，执行的应该是hive2的代码，所以猜测问题可能是：

1)由于jar包污染，启动jvm的时候classpath里同时有hive1和hive2的jar，有时加载类用到hive1的jar(可以正常运行)，有时用到hive2的jar(会报错)；

2)集群服务器环境配置差异，有的服务器classpath中没有hive2的jar(可以正常运行)，有的服务器classpath有hive2的jar(可能报错)；

对比正常和报错的服务器的环境配置以及启动命令发现都是一样的，没有发现hive2的jar，

通过在启动任务时增加-verbose:class，发现正常和报错的情况下，Hive类都是从Hive1.2.1的jar加载出来的，

[Loaded org.apache.hadoop.hive.ql.metadata.Hive from file:/export/Data/tmp/hadoop-tmp/nm-local-dir/filecache/98/hive-exec-1.2.1.spark2.jar]

否定了上边的两种猜测；

分析提交任务命令发现，用到了spark.yarn.jars，避免每次都上传spark的jar，这些jar会被作为filecache缓存在yarn.nodemanager.local-dirs下，

反编译正常和报错服务器上filecache里的hive-exec-1.2.1.spark2.jar最终发现问题，

正常服务器上Hive类代码是：

if (FileUtils.isSubDir(oldPath, destf, fs2))

FileUtils.trashFilesUnderDir(fs2, oldPath, conf);

报错服务器上的Hive类代码是：

private static boolean trashFilesUnderDir(final FileSystem fs, Path f, final Configuration conf) throws IOException {

FileStatus[] statuses = fs.listStatus(f, FileUtils.HIDDEN_FILES_PATH_FILTER);

boolean result = true;

List> futures = new LinkedList();

ExecutorService pool = conf.getInt(ConfVars.HIVE_MOVE_FILES_THREAD_COUNT.varname, 25) > 0 ? Executors.newFixedThreadPool(conf.getInt(ConfVars.HIVE_MOVE_FILES_THREAD_COUNT.varname, 25), (new ThreadFactoryBuilder()).setDaemon(true).setNameFormat("Delete-Thread-%d").build()) : null;

报错服务器上的Hive类用到ConfVars.HIVE_MOVE_FILES_THREAD_COUNT，但是在hive-common-1.2.1.jar中的ConfVars不存在这个属性，所以报错java.lang.NoSuchFieldError，

所以问题应该是hdfs上的hive-exec-1.2.1.spark2.jar一开始是对的，然后所有nodemanager下载到本地作为filecache，后来这个jar被改错了(使用hive2编译spark)，然后新加的nodemanager会下载有问题的jar作为filecache，这样结果就是有的服务器执行正常，有的服务器执行报错；

yarn中的filecache清理有两个配置

yarn.nodemanager.localizer.cache.cleanup.interval-ms：600000  Interval in between cache cleanups.

yarn.nodemanager.localizer.cache.target-size-mb：10240    Target size of localizer cache in MB, per local directory.

每隔cleanup.interval-ms会检查本地filecache大小是否超过target-size-mb，超过才清理，不超过就一直使用filecache；