The cluster enabled shortCircuitLocalReads.
<property>
<name>dfs.client.read.shortcircuit</name>
<value>true</value>
</property>
When enabled replication,we found a large number of error logs.
1.shortCircuitLocalReads(fail everytime).
2.Try reading via the datanode on targetAddr(success).
How to make shortCircuitLocalReads successfully when enabled replication?
2016-08-03 10:46:21,721 DEBUG
org.apache.hadoop.hbase.replication.regionserver.ReplicationSource: Opening
log for replication dn7%2C60020%2C1470136216957.1470192327030 at 16999670
2016-08-03 10:46:21,723 WARN org.apache.hadoop.hdfs.DFSClient:
BlockReaderLocal requested with incorrect offset: Offset 0 and length
17073479 don't match block blk_4137524355009640437_53760530 ( blockLen
16999670 )
2016-08-03 10:46:21,723 WARN org.apache.hadoop.hdfs.DFSClient:
BlockReaderLocal: Removing blk_4137524355009640437_53760530 from cache
because local file
/sdd/hdfs/dfs/data/blocksBeingWritten/blk_4137524355009640437 could not be
opened.
2016-08-03 10:46:21,724 INFO org.apache.hadoop.hdfs.DFSClient: Failed to
read block blk_4137524355009640437_53760530 on local
machinejava.io.IOException: Offset 0 and length 17073479 don't match block
blk_4137524355009640437_53760530 ( blockLen 16999670 )
at org.apache.hadoop.hdfs.BlockReaderLocal.<init>(BlockReaderLocal.java:287)
at
org.apache.hadoop.hdfs.BlockReaderLocal.newBlockReader(BlockReaderLocal.java:171)
at org.apache.hadoop.hdfs.DFSClient.getLocalBlockReader(DFSClient.java:358)
at org.apache.hadoop.hdfs.DFSClient.access$800(DFSClient.java:74)
at
org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:2073)
at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:2224)
at java.io.DataInputStream.read(DataInputStream.java:149)
at java.io.DataInputStream.readFully(DataInputStream.java:195)
at java.io.DataInputStream.readFully(DataInputStream.java:169)
at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1508)
at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1486)
at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1475)
at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1470)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader$WALReader.<init>(SequenceFileLogReader.java:55)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.init(SequenceFileLogReader.java:178)
at org.apache.hadoop.hbase.regionserver.wal.HLog.getReader(HLog.java:734)
at
org.apache.hadoop.hbase.replication.regionserver.ReplicationHLogReaderManager.openReader(ReplicationHLogReaderManager.java:69)
at
org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:574)
at
org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:364)
2016-08-03 10:46:21,724 INFO org.apache.hadoop.hdfs.DFSClient: Try reading
via the datanode on /192.168.7.139:50010
