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https://issues.apache.org/jira/browse/HDFS-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866519#action_12866519
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Todd Lipcon commented on HDFS-941:
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I'd like to hold off on this just a bit longer yet - I'm seeing this
sporadically in my testing:
Caused by: java.lang.IndexOutOfBoundsException
at org.apache.hadoop.fs.FSInputChecker.read(FSInputChecker.java:151)
at
org.apache.hadoop.hdfs.DFSClient$BlockReader.read(DFSClient.java:1155)
at
org.apache.hadoop.fs.FSInputChecker.readFully(FSInputChecker.java:384)
at
org.apache.hadoop.hdfs.DFSClient$BlockReader.readAll(DFSClient.java:1441)
at
org.apache.hadoop.hdfs.DFSClient$DFSInputStream.fetchBlockByteRange(DFSClient.java:1913)
at
org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:2035)
at
org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:46)
But the above benchmarks do show that the idea has a lot of promise! (and the
above trace may in fact be an HBase bug)
> 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
>
>
> 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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