[HDFS-4853] Handle unresolved InetAddress for favored nodes in DFSClient#create()

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 2.1.0-beta
• Assignee: Unassigned
• Reporter: Ted Yu
• Created: 25/May/13 02:46
• Updated: 30/Jul/13 10:25
• Resolved: 30/Jul/13 10:25

Description

The underlying API is:

  public DFSOutputStream create(String src, 
                             FsPermission permission,
                             EnumSet<CreateFlag> flag, 
                             boolean createParent,
                             short replication,
                             long blockSize,
                             Progressable progress,
                             int buffersize,
                             ChecksumOpt checksumOpt,
                             InetSocketAddress[] favoredNodes) throws IOException {

Here is related code:

        favoredNodeStrs[i] = 
            favoredNodes[i].getAddress().getHostAddress() + ":" 
                         + favoredNodes[i].getPort();

I observed the following stack trace in HBase unit test:

testFavoredNodes(org.apache.hadoop.hbase.regionserver.TestRegionFavoredNodes)  Time elapsed: 0.106 sec  <<< ERROR!
org.apache.hadoop.hbase.exceptions.DroppedSnapshotException: region: table,rrr,1369355298031.1fdb1b446b02b497f0869a08adad7745.
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1568)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1429)
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1347)
        at org.apache.hadoop.hbase.MiniHBaseCluster.flushcache(MiniHBaseCluster.java:531)
        at org.apache.hadoop.hbase.HBaseTestingUtility.flush(HBaseTestingUtility.java:961)
        at org.apache.hadoop.hbase.regionserver.TestRegionFavoredNodes.testFavoredNodes(TestRegionFavoredNodes.java:132)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
        at org.junit.runners.Suite.runChild(Suite.java:127)
        at org.junit.runners.Suite.runChild(Suite.java:26)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: java.lang.NullPointerException
        at org.apache.hadoop.hbase.util.FSUtils.create(FSUtils.java:293)
        at org.apache.hadoop.hbase.io.hfile.AbstractHFileWriter.createOutputStream(AbstractHFileWriter.java:268)
        at org.apache.hadoop.hbase.io.hfile.HFile$WriterFactory.create(HFile.java:427)
        at org.apache.hadoop.hbase.regionserver.StoreFile$Writer.<init>(StoreFile.java:791)
        at org.apache.hadoop.hbase.regionserver.StoreFile$Writer.<init>(StoreFile.java:733)
        at org.apache.hadoop.hbase.regionserver.StoreFile$WriterBuilder.build(StoreFile.java:671)
        at org.apache.hadoop.hbase.regionserver.HStore.createWriterInTmp(HStore.java:799)
        at org.apache.hadoop.hbase.regionserver.DefaultStoreFlusher.flushSnapshot(DefaultStoreFlusher.java:75)
        at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:704)
        at org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.flushCache(HStore.java:1813)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1543)
        ... 33 more
Caused by: java.lang.NullPointerException
        at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:1306)
        at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:283)

Looks like one of the favored nodes couldn't resolve favoredNodes[i].getAddress(), leading to NullPointerException.

Issue Links

• is related to: HBASE-8614 Handle possible NullPointerException in FSUtils#create(FileSystem fs, Path path, FsPermission perm, InetSocketAddress[] favoredNodes)