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https://issues.apache.org/jira/browse/HDFS-12178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16098165#comment-16098165
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Nandakumar commented on HDFS-12178:
-----------------------------------
patch v01 attached.
{{!containersCreated.contains(containerName)}} check is done before
{{synchronized (containerName.intern())}}, since {{String#intern()}} is a
costly operation. {{!containersCreated.contains(containerName)}} is again
checked inside synchronized block so that no two threads try to create same
container again.
Benchmarking of String#intern() for reference: [Performance penalty of
String.intern() | https://stackoverflow.com/a/10628759/2170141]
> Ozone: OzoneClient: Handling SCM container creationFlag at client side
> ----------------------------------------------------------------------
>
> Key: HDFS-12178
> URL: https://issues.apache.org/jira/browse/HDFS-12178
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Reporter: Nandakumar
> Assignee: Nandakumar
> Attachments: HDFS-12178-HDFS-7240.000.patch,
> HDFS-12178-HDFS-7240.001.patch
>
>
> SCM BlockManager provisions a pool of containers upon block creation request,
> only one container is returned with creationFlag to the client. The other
> containers provisioned in the same batch will not have this flag. This jira
> is to handle that scenario at client side, until HDFS-11888 is fixed.
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