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https://issues.apache.org/jira/browse/HADOOP-18517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629804#comment-17629804
]
ASF GitHub Bot commented on HADOOP-18517:
-----------------------------------------
steveloughran commented on PR #5103:
URL: https://github.com/apache/hadoop/pull/5103#issuecomment-1305592769
removed openFile() option; this is cluster admin only.
tested with 14 threads and got timeout on lease and throttling out of range.
clearly too many threads
```
[ERROR] Tests run: 13, Failures: 0, Errors: 1, Skipped: 0, Time elapsed:
94.978 s <<< FAILURE! - in
org.apache.hadoop.fs.azurebfs.ITestAzureBlobFileSystemLease
[ERROR]
testTwoWritersCreateAppendWithInfiniteLeaseEnabled(org.apache.hadoop.fs.azurebfs.ITestAzureBlobFileSystemLease)
Time elapsed: 94.978 s <<< ERROR!
org.junit.runners.model.TestTimedOutException: test timed out after 90000
milliseconds
at sun.misc.Unsafe.park(Native Method)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:537)
at
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.FluentFuture$TrustedFuture.get(FluentFuture.java:88)
at
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:62)
at
org.apache.hadoop.fs.azurebfs.services.AbfsLease.<init>(AbfsLease.java:109)
```
> ABFS: Add fs.azure.enable.readahead option to disable readahead
> ---------------------------------------------------------------
>
> Key: HADOOP-18517
> URL: https://issues.apache.org/jira/browse/HADOOP-18517
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/azure
> Affects Versions: 3.3.4
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
>
> Add an option fs.azure.enable.readahead to allow the abfs readahead to be
> disabled.
> This has been shipping in cloudera releases, because workloads with heavy
> random IO don't always benefit from prefetching.
> Pulling this in to ASF hadoop allows for
> * everyone to experiment with/without prefetching
> * ability to disable prefetching if you have problems with it
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