Hi. I'm testing HDFS fault-tolerance, and randomly disconnecting and powering off the chunk nodes to see how HDFS withstands it.
After I have disconnected a chunk node, the logs have started to fill with the following errors: 09/04/11 02:25:12 INFO dfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink 192.168.253.41:50010 09/04/11 02:25:12 INFO dfs.DFSClient: Abandoning block blk_-656235730036158252_1379 09/04/11 02:25:12 INFO dfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink 192.168.253.41:50010 09/04/11 02:25:12 INFO dfs.DFSClient: Abandoning block blk_4525038275659790960_1379 09/04/11 02:25:12 INFO dfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink 192.168.253.41:50010 09/04/11 02:25:12 INFO dfs.DFSClient: Abandoning block blk_4496668387968639765_1379 09/04/11 02:25:12 INFO dfs.DFSClient: Waiting to find target node: 192.168.253.20:50010 09/04/11 02:25:12 INFO dfs.DFSClient: Waiting to find target node: 192.168.253.20:50010 09/04/11 02:25:12 INFO dfs.DFSClient: Waiting to find target node: 192.168.253.20:50010 09/04/11 02:25:21 INFO dfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink 192.168.253.41:50010 09/04/11 02:25:21 INFO dfs.DFSClient: Abandoning block blk_7909869387543801936_1379 09/04/11 02:25:21 INFO dfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink 192.168.253.41:50010 09/04/11 02:25:21 INFO dfs.DFSClient: Abandoning block blk_3548805008548426073_1368 09/04/11 02:25:21 INFO dfs.DFSClient: Waiting to find target node: 192.168.253.20:50010 09/04/11 02:25:25 INFO dfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink 192.168.253.41:50010 09/04/11 02:25:25 INFO dfs.DFSClient: Abandoning block blk_6143739150500056332_1379 09/04/11 02:25:25 INFO dfs.DFSClient: Waiting to find target node: 192.168.253.20:50010 09/04/11 02:25:30 INFO dfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Bad connect ack with firstBadLink 192.168.253.41:50010 09/04/11 02:25:30 INFO dfs.DFSClient: Abandoning block blk_5626187863612769755_1379 Any idea what it means, and should I be concerned about it. Regards.
