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stack commented on HDFS-941:
----------------------------
+1 on commit. Have run this patch first in a "light" random read loading over night and then
over this morning with a 'heavy' random read + write loading on 5 node cluster. Discernible
perf improvement (caching involved so hard to say for sure but I see 20% improvement if just
random reads).
@Kihwal Fair enough.
> Datanode xceiver protocol should allow reuse of a connection
> ------------------------------------------------------------
>
> Key: HDFS-941
> URL: https://issues.apache.org/jira/browse/HDFS-941
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node, hdfs client
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: bc Wong
> Attachments: HDFS-941-1.patch, HDFS-941-2.patch, HDFS-941-3.patch, HDFS-941-3.patch,
HDFS-941-4.patch, HDFS-941-5.patch, HDFS-941-6.patch, HDFS-941-6.patch, HDFS-941-6.patch,
hdfs-941.txt, hdfs-941.txt, hdfs941-1.png
>
>
> Right now each connection into the datanode xceiver only processes one operation.
> In the case that an operation leaves the stream in a well-defined state (eg a client
reads to the end of a block successfully) the same connection could be reused for a second
operation. This should improve random read performance significantly.
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