[HADOOP-2976] Blocks staying underreplicated (for unclosed file)

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.15.3
• Fix Version/s: 0.17.0
• Assignee: Dhruba Borthakur
• Reporter: Koji Noguchi
• Created: 08/Mar/08 00:25
• Updated: 08/Jul/09 16:42
• Resolved: 17/Mar/08 05:17

Description

We had two files staying underreplicated for over a day.
I checked that these under-replicated blocks are not corrupted.
(They were both task tmp files and most likely didn't get closed.)

Taking one file, /aaa/_task_200803040823_0001_r_000421_0/part-00421

Namenode log showed

namenode.log.2008-03-04 2008-03-04 16:19:21,478 INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.allocateBlock: /aaa/task_200803040823_0001_r_000421_0/part-00421. blk-7848645760735416126
2008-03-04 16:19:24,357 INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.addStoredBlock: blockMap updated: 11.1.111.111:22222 is added to blk_-7848645760735416126

On the datanode 11.1.111.111, it showed

2008-03-04 16:19:24,358 INFO org.apache.hadoop.dfs.DataNode: Received block blk_-7848645760735416126 from /55.55.55.55 and operation failed at /22.2.222.22

On the second datanode 22.2.222.22, it showed

2008-03-04 16:19:21,578 INFO org.apache.hadoop.dfs.DataNode: Exception writing to mirror 33.3.33.33
java.net.SocketException: Connection reset
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:96)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
at java.io.DataOutputStream.write(DataOutputStream.java:90)
at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveChunk(DataNode.java:1333)
at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveBlock(DataNode.java:1386)
at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:938)
at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:804)
at java.lang.Thread.run(Thread.java:619)

2008-03-04 16:19:24,358 ERROR org.apache.hadoop.dfs.DataNode: DataXceiver: java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at java.io.DataOutputStream.flush(DataOutputStream.java:106)
at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveBlock(DataNode.java:1394)
at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:938)
at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:804)
at java.lang.Thread.run(Thread.java:619)