[jira] [Created] (HDFS-9879) Erasure Coding : schedule striped blocks to be cached on DataNodes

[Rakesh R (JIRA)]

Rakesh R created HDFS-9879:
------------------------------

             Summary: Erasure Coding : schedule striped blocks to be cached on 
DataNodes
                 Key: HDFS-9879
                 URL: https://issues.apache.org/jira/browse/HDFS-9879
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Rakesh R
            Assignee: Rakesh R


This jira to discuss and implement the caching of striped block objects on the 
appropriate datanode.

Presently it is checking block group size and scheduling the blockGroupId to 
the datanode, which needs to be refined by checking the 
{{StripedBlockUtil.getInternalBlockLength()}} and schedule proper blockId to 
the datanode.
{code}
CacheReplicationMonitor.java

      if (pendingCapacity < blockInfo.getNumBytes()) {
        LOG.trace("Block {}: DataNode {} is not a valid possibility " +
            "because the block has size {}, but the DataNode only has {} " +
            "bytes of cache remaining ({} pending bytes, {} already cached.)",
            blockInfo.getBlockId(), datanode.getDatanodeUuid(),
            blockInfo.getNumBytes(), pendingCapacity, pendingBytes,
            datanode.getCacheRemaining());
        outOfCapacity++;
        continue;
      }

    for (DatanodeDescriptor datanode : chosen) {
      LOG.trace("Block {}: added to PENDING_CACHED on DataNode {}",
          blockInfo.getBlockId(), datanode.getDatanodeUuid());
      pendingCached.add(datanode);
      boolean added = datanode.getPendingCached().add(cachedBlock);
      assert added;
    }
{code}



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