cuiyang created HDFS-8459:
-----------------------------
Summary: Question: Why Namenode doesn't judge the status of
replicas when convert block status from commited to complete?
Key: HDFS-8459
URL: https://issues.apache.org/jira/browse/HDFS-8459
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: cuiyang
Why Namenode doesn't judge the status of replicas when convert block status
from commited to complete?
When client finished write block and call namenode.complete(), namenode do
things as follow(in BlockManager::commitOrCompleteLastBlock):
final boolean b = commitBlock((BlockInfoUnderConstruction)lastBlock,
commitBlock);
if(countNodes(lastBlock).liveReplicas() >= minReplication)
completeBlock(bc, bc.numBlocks()-1, false);
return b;
But it doesn't care how many replicas which status is finalized! Because if
there is no one replica which status is not finalized, the block should not
convert to complete status!
According to the appendDesign3.pdf
(https://issues.apache.org/jira/secure/attachment/12445209/appendDesign3.pdf):
Complete:
A
complete
block
is
a
block
whose
length
and
GS
are
finalized
and
NameNode
has
seen
a
GS/len
matched
finalized
replica
of
the
block.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
