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[HDFS-1384] NameNode should give client the first node in the pipeline from different rack  other than that of excludedNodes list in the same rack. - HDFS - [issue]
...We saw a case that NN keeps giving client nodes from the same rack, hence an exception from client when try to setup the pipeline. Client retries 5 times and fails.Here is more details. Supp...
http://issues.apache.org/jira/browse/HDFS-1384    Author: Thanh Do, 2014-07-31, 00:50
[HDFS-1380] The append pipeline does not followed TSP principal - HDFS - [issue]
...1. Say we have 2 racks: rack-0 and rack-1. Rack-0 has dn1, dn2, dn3. Rack-0 has dn4, dn5, dn6.2. Suppose client is in rack-0, and the write pipeline is:client --> localnode --> other r...
http://issues.apache.org/jira/browse/HDFS-1380    Author: Thanh Do, 2014-07-31, 00:49
[HDFS-1238] A block is stuck in ongoingRecovery due to exception not propagated - HDFS - [issue]
...Setup:+  # datanodes = 2+ replication factor = 2+ failure type = transient (i.e. a java I/O call that throws I/O Exception or returns false)+ # failures = 2+ When/where failures happen:...
http://issues.apache.org/jira/browse/HDFS-1238    Author: Thanh Do, 2014-07-30, 21:27
[HDFS-1231] Generation Stamp mismatches, leading to failed append - HDFS - [issue]
...Summary: the recoverBlock is not atomic, leading retrial fails whenfacing a failure. Setup:+ # available datanodes = 3+ # disks / datanode = 1+ # failures = 2+ failure type = crash+ When/whe...
http://issues.apache.org/jira/browse/HDFS-1231    Author: Thanh Do, 2014-07-30, 21:26
[HDFS-1228] CRC does not match when retrying appending a partial block - HDFS - [issue]
...Summary: when appending to partial block, if is possible thatretrial when facing an exception fails due to a checksum mismatch.Append operation is not atomic (either complete or fail complet...
http://issues.apache.org/jira/browse/HDFS-1228    Author: Thanh Do, 2014-07-30, 21:26
[HDFS-1225] Block lost when primary crashes in recoverBlock - HDFS - [issue]
...Summary: Block is lost if primary datanode crashes in the middle tryUpdateBlock. Setup: available datanode = 2 replica = 2 disks / datanode = 1 failures = 1 failure type = crashWhen/where fa...
http://issues.apache.org/jira/browse/HDFS-1225    Author: Thanh Do, 2014-07-30, 21:24
[HDFS-1224] Stale connection makes node miss append - HDFS - [issue]
...Summary: if a datanode crashes and restarts, it may miss an append. Setup:+ # available datanodes = 3+ # replica = 3 + # disks / datanode = 1+ # failures = 1+ failure type = crash+ When/wher...
http://issues.apache.org/jira/browse/HDFS-1224    Author: Thanh Do, 2014-07-30, 21:24
[HDFS-1382] A transient failure with edits log and a corrupted fstime together could lead to a data loss - HDFS - [issue]
...We experienced a data loss situation that due to double failures.One is transient disk failure with edits logs and the other is corrupted fstime.Here is the detail:1. NameNode has 2 edits di...
http://issues.apache.org/jira/browse/HDFS-1382    Author: Thanh Do, 2014-07-30, 21:23
[HDFS-1336] TruncateBlock does not update in-memory information correctly - HDFS - [issue]
...Component: data node Version: 0.20-append Summary: we found a case that when a block is truncated during updateBlock,the length on the ongoingCreates is not updated, hence leading to failed ...
http://issues.apache.org/jira/browse/HDFS-1336    Author: Thanh Do, 2014-04-03, 03:39
Re: Datanodes using public ip, why? - HDFS - [mail # user]
...have you tried playing with this config parameter  dfs.datanode.dns.interface  ?   On Thu, Jul 11, 2013 at 4:20 AM, Ben Kim  wrote:  ...
   Author: Thanh Do, 2013-07-11, 17:30
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