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From "dragon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10125) CLONE - Erasure coding: Persist cellSize in BlockInfoStriped and StripedBlocksFeature
Date Tue, 15 Mar 2016 08:17:35 GMT
dragon created HDFS-10125:
-----------------------------

             Summary: CLONE - Erasure coding: Persist cellSize in BlockInfoStriped and StripedBlocksFeature
                 Key: HDFS-10125
                 URL: https://issues.apache.org/jira/browse/HDFS-10125
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            Assignee: Walter Su
             Fix For: HDFS-7285


Zhe Zhang, Kai Zheng and I had a offline discussion. Here is what we thought:  Add a cellSize
field in BlockInfoStriped as a workaround, and deal with memory usage in follow-on.(HDFS-8059)

discussion in HDFS-8494:
from Walter Su:
{quote}
I think BlockInfoStriped needs to keep cellSize.
{quote}
from [~vinayrpet]:
{quote}
I too was thinking the same when the FSImageLoader problem has came up. This will increase
the memory usage by ~4bytes for each block though.
{quote}
from [~jingzhao]
{quote}
-Also, we should consider adding a chunk size field to StripedBlockProto and removing the
cell size field from HdfsFileStatus. In this way we can access the chunk size information
in the storage layer.-
{quote}
==
update:
from [~jingzhao]
{quote}
For fsimage part, since HDFS-8585 just removes StripedBlockProto, I guess what we can do here
is to either 1) add the cellSize information into StripedBlocksFeature in fsimage.proto, or
2) bring StripedBlockProto back and put block info and cell size there.
{quote}



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