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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7633) When Datanode has too many blocks, BlockPoolSliceScanner.getNewBlockScanTime thows IllegalArgumentException
Date Fri, 16 Jan 2015 07:47:34 GMT
Walter Su created HDFS-7633:
-------------------------------

             Summary: When Datanode has too many blocks, BlockPoolSliceScanner.getNewBlockScanTime
thows IllegalArgumentException
                 Key: HDFS-7633
                 URL: https://issues.apache.org/jira/browse/HDFS-7633
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
    Affects Versions: 2.6.0
            Reporter: Walter Su
            Priority: Minor


When Total blocks of one of my DNs reaches 33554432, It refuses to accept more blocks, this
is the ERROR.
2015-01-16 15:21:44,571 | ERROR | DataXceiver for client  at /172.1.1.8:50490 [Receiving block
BP-1976278848-172.1.1.2-1419846518085:blk_1221043436_147936990] | datasight-198:25009:DataXceiver
error processing WRITE_BLOCK operation  src: /172.1.1.8:50490 dst: /172.1.1.11:25009 | org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:250)
java.lang.IllegalArgumentException: n must be positive
        at java.util.Random.nextInt(Random.java:300)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner.getNewBlockScanTime(BlockPoolSliceScanner.java:263)
        at org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner.addBlock(BlockPoolSliceScanner.java:276)
        at org.apache.hadoop.hdfs.server.datanode.DataBlockScanner.addBlock(DataBlockScanner.java:193)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.closeBlock(DataNode.java:1733)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:765)
        at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:124)
        at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:71)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:232)
        at java.lang.Thread.run(Thread.java:745)

in function
org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner.getNewBlockScanTime()
when blockMap.size() is too big,
Math.max(blockMap.size(),1)  is negtive
Math.max(blockMap.size(),1) * 600 * 1000L is negtive
(int)period  is Integer.MIN_VALUE
Math.abs((int)period) is Integer.MIN_VALUE , which is negtive
DFSUtil.getRandom().nextInt(periodInt)  will thows IllegalArgumentException

I use Java HotSpot (build 1.7.0_05-b05)




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