Details
Major Description
RS is normally working and writing on the WAL.
HDFS is killed and restarted, and the RS try to do a roll.
The close fail, but the roll succeed (because hdfs is now up) and everything works.
2015-12-11 21:52:28,058 ERROR org.apache.hadoop.hbase.regionserver.wal.ProtobufLogWriter: Got IOException while writing trailer java.io.IOException: All datanodes 10.51.30.152:50010 are bad. Aborting... at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1147) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:945) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:496) 2015-12-11 21:52:28,059 ERROR org.apache.hadoop.hbase.regionserver.wal.FSHLog: Failed close of HLog writer java.io.IOException: All datanodes 10.51.30.152:50010 are bad. Aborting... at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1147) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:945) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:496) 2015-12-11 21:52:28,059 WARN org.apache.hadoop.hbase.regionserver.wal.FSHLog: Riding over HLog close failure! error count=1
The problem is on the replication side. that log we rolled and we were not able to close
is waiting for a lease recovery.
2015-12-11 21:16:31,909 ERROR org.apache.hadoop.hbase.regionserver.wal.HLogFactory: Can't open after 267 attempts and 301124ms
the WALFactory notify us about that, but there is nothing on the RS side that perform the WAL recovery.
2015-12-11 21:11:30,921 WARN org.apache.hadoop.hbase.regionserver.wal.HLogFactory: Lease should have recovered. This is not expected. Will retry
java.io.IOException: Cannot obtain block length for LocatedBlock{BP-1547065147-10.51.30.152-1446756937665:blk_1073801614_61243; getBlockSize()=83; corrupt=false; offset=0; locs=[10.51.30.154:50010, 10.51.30.152:50010, 10.51.30.155:50010]}
at org.apache.hadoop.hdfs.DFSInputStream.readBlockLength(DFSInputStream.java:358)
at org.apache.hadoop.hdfs.DFSInputStream.fetchLocatedBlocksAndGetLastBlockLength(DFSInputStream.java:300)
at org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:237)
at org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:230)
at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1448)
at org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:301)
at org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:297)
at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:297)
at org.apache.hadoop.fs.FilterFileSystem.open(FilterFileSystem.java:161)
at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:766)
at org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:116)
at org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:89)
at org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:77)
at org.apache.hadoop.hbase.replication.regionserver.ReplicationHLogReaderManager.openReader(ReplicationHLogReaderManager.java:68)
at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:508)
at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:321)
the only way to trigger a WAL recovery is to restart and force the master to trigger the lease recovery on WAL split.
but there is a case where restarting will not help. If the RS keeps going rolling and flushing the unclosed WAL will be moved in the archive, and at that point the master will never try to do a lease recovery on it.
since we know that the RS is still going, should we try to recover the lease on the RS side?
is it better/safer to trigger an abort on the RS, so we have only the master doing lease recovery?