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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1972) Failed split results in closed region and non-registration of daughters; fix the order in which things are run
Date Thu, 12 Nov 2009 01:38:39 GMT
Failed split results in closed region and non-registration of daughters; fix the order in which
things are run
--------------------------------------------------------------------------------------------------------------

                 Key: HBASE-1972
                 URL: https://issues.apache.org/jira/browse/HBASE-1972
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack
            Priority: Blocker
             Fix For: 0.21.0


As part of a split, we go to close the region.  The close fails because flush failed -- a
DN was down and HDFS refuses to move past it -- so we jump up out of the close with an IOE.
 But the region has been closed yet its still in the .META. as online.

Here is where the hole is:

1. CompactSplitThread calls split.
2. This calls HRegion splitRegion.
3. splitRegion calls close(false).
4. Down the end of the close, we get as far as the LOG.info("Closed " + this)..... but a DFSClient
running thread throws an exception because it can't allocate block for the flush made as part
of the close (Ain't sure how... we should add more try/catch in here):


{code}
2009-11-12 00:47:17,865 [regionserver/208.76.44.142:60020.compactor] DEBUG org.apache.hadoop.hbase.regionserver.Store:
Added hdfs://aa0-000-12.u.powerset.com:9002/hbase/TestTable/868626151/info/5071349140567656566,
entries=46975, sequenceid=2350017, memsize=52.0m, filesize=46.5m to TestTable,,1257986664542
2009-11-12 00:47:17,866 [regionserver/208.76.44.142:60020.compactor] DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
Finished memstore flush of ~52.0m for region TestTable,,1257986664542 in 7985ms, sequence
id=2350017, compaction requested=false
2009-11-12 00:47:17,866 [regionserver/208.76.44.142:60020.compactor] DEBUG org.apache.hadoop.hbase.regionserver.Store:
closed info
2009-11-12 00:47:17,866 [regionserver/208.76.44.142:60020.compactor] INFO org.apache.hadoop.hbase.regionserver.HRegion:
Closed TestTable,,1257986664542
2009-11-12 00:47:17,906 [Thread-315] INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 208.76.44.140:51010
2009-11-12 00:47:17,906 [Thread-315] INFO org.apache.hadoop.hdfs.DFSClient: Abandoning block
blk_1351692500502810095_1391
2009-11-12 00:47:23,918 [Thread-315] INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 208.76.44.140:51010
2009-11-12 00:47:23,918 [Thread-315] INFO org.apache.hadoop.hdfs.DFSClient: Abandoning block
blk_-3310646336307339512_1391
2009-11-12 00:47:29,982 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 208.76.44.140:51010
2009-11-12 00:47:29,982 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Abandoning block
blk_3070440586900692765_1393
2009-11-12 00:47:35,997 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 208.76.44.140:51010
2009-11-12 00:47:35,997 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Abandoning block
blk_-5656011219762164043_1393
2009-11-12 00:47:42,007 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 208.76.44.140:51010
2009-11-12 00:47:42,007 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Abandoning block
blk_-2359634393837722978_1393
2009-11-12 00:47:48,017 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 208.76.44.140:51010
2009-11-12 00:47:48,017 [Thread-318] INFO org.apache.hadoop.hdfs.DFSClient: Abandoning block
blk_-1626727145091780831_1393
2009-11-12 00:47:54,022 [Thread-318] WARN org.apache.hadoop.hdfs.DFSClient: DataStreamer Exception:
java.io.IOException: Unable to create new block.
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSClient.java:3100)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2681)

2009-11-12 00:47:54,022 [Thread-318] WARN org.apache.hadoop.hdfs.DFSClient: Could not get
block locations. Source file "/hbase/TestTable/868626151/splits/1211221550/info/5071349140567656566.868626151"
- Aborting...
2009-11-12 00:47:54,029 [regionserver/208.76.44.142:60020.compactor] ERROR org.apache.hadoop.hbase.regionserver.CompactSplitThread:
Compaction/Split failed for region TestTable,,1257986664542
java.io.IOException: Bad connect ack with firstBadLink as 208.76.44.140:51010
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.createBlockOutputStream(DFSClient.java:3160)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSClient.java:3080)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2681)
{code}

Marking this as blocker.

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