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  1. Hadoop HDFS
  2. HDFS-6804

Add test for race condition between transferring block and appending block causes "Unexpected checksum mismatch exception"

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 2.2.0
    • 2.8.4
    • datanode
    • None

    Description

      We found some error log in the datanode. like this

      2014-07-22 01:49:51,338 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Ex
ception for BP-2072804351-192.168.2.104-1406008383435:blk_1073741997_9248
java.io.IOException: Terminating due to a checksum error.java.io.IOException: Unexpected checksum mismatch while writing BP-2072804351-192.168.2.104-1406008383435:blk_1073741997_9248 from /192.168.2.101:39495
        at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:536)
        at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:703)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:575)
        at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:115)
        at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:68)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:221)
        at java.lang.Thread.run(Thread.java:744)

      While on the source datanode, the log says the block is transmitted.

      2014-07-22 01:49:50,805 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Da
taTransfer: Transmitted BP-2072804351-192.168.2.104-1406008383435:blk_1073741997
_9248 (numBytes=16188152) to /192.168.2.103:50010

      When the destination datanode gets the checksum mismatch, it reports bad block to NameNode and NameNode marks the replica on the source datanode as corrupt. But actually, the replica on the source datanode is valid. Because the replica can pass the checksum verification.

      In all, the replica on the source data is wrongly marked as corrupted.

      Attachments

        1. Testcase_append_transfer_block.patch
          5 kB
          Brahma Reddy Battula
        2. HDFS-6804-branch-2.8.patch
          6 kB
          Brahma Reddy Battula
        3. HDFS-6804-branch-2.8-002.patch
          6 kB
          Brahma Reddy Battula
        4. HDFS-6804-branch-2.8-003.patch
          6 kB
          Brahma Reddy Battula

        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. HDFS-11160 VolumeScanner reports write-in-progress replicas as corrupt incorrectly

          • Major - Major loss of function.
          • Resolved
          Is contained by

          Bug - A problem which impairs or prevents the functions of the product. HDFS-11056 Concurrent append and read operations lead to checksum error

          • Major - Major loss of function.
          • Resolved
          is related to

          Bug - A problem which impairs or prevents the functions of the product. HDFS-10587 Incorrect offset/length calculation in pipeline recovery causes block corruption

          • Major - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. HDFS-11056 Concurrent append and read operations lead to checksum error

          • Major - Major loss of function.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. HDFS-6937 Another issue in handling checksum errors in write pipeline

          • Major - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. HDFS-11160 VolumeScanner reports write-in-progress replicas as corrupt incorrectly

          • Major - Major loss of function.
          • Resolved

          Activity

            People

              brahmareddy Brahma Reddy Battula
              wangg23 Gordon Wang
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              Dates

                Created:
                Updated:
                Resolved: