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https://issues.apache.org/jira/browse/HDFS-4595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600598#comment-13600598
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Colin Patrick McCabe commented on HDFS-4595:
--------------------------------------------
This bug was fixed in HDFS-347. However, since we have decided to keep the
legacy block reader code available, this fix has some value still.
{code}
void disableShortCircuit() {
+ LOG.info("Short circuit is disalbed");
shortCircuitLocalReads = false;
}
{code}
Spelling.
{code}
- DFSClient.LOG.warn("Short circuit access failed ", ex);
+ DFSClient.LOG.warn("Short circuit access failed " + ex);
{code}
Hmm. Why not print the full exception trace?
> When short circuit read is disallowed, DFSClient does disable short circuit
> and fall back to regular reads
> ----------------------------------------------------------------------------------------------------------
>
> Key: HDFS-4595
> URL: https://issues.apache.org/jira/browse/HDFS-4595
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.0.0-alpha
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: HDFS-4595.patch, HDFS-4595.patch
>
>
> In 1.0, when short circuit is disallowed for a user, the DFSClient disables
> short circuit and falls back to the regular socket based reads over
> DataTransferProtocol. In release 2.0, this fallback functionality is not
> working.
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