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https://issues.apache.org/jira/browse/HDFS-11182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15762350#comment-15762350
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ASF GitHub Bot commented on HDFS-11182:
---------------------------------------
Github user xiaoyuyao commented on a diff in the pull request:
https://github.com/apache/hadoop/pull/168#discussion_r93122724
--- Diff:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/checker/DatasetVolumeChecker.java
---
@@ -299,26 +327,35 @@ public void checkVolume(
private class ResultHandler
implements FutureCallback<VolumeCheckResult> {
private final FsVolumeReference reference;
- private final Set<StorageLocation> failedVolumes;
- private final Set<StorageLocation> healthyVolumes;
- private final CountDownLatch latch;
- private final AtomicLong numVolumes;
+ private final Set<FsVolumeSpi> failedVolumes;
+ private final Set<FsVolumeSpi> healthyVolumes;
+ private final Semaphore semaphore;
@Nullable
private final Callback callback;
+ /**
+ *
+ * @param reference FsVolumeReference to be released when the check is
+ * complete.
+ * @param healthyVolumes set of healthy volumes. If the disk check is
+ * successful, add the volume here.
+ * @param failedVolumes set of failed volumes. If the disk check fails,
+ * add the volume here.
+ * @param semaphore semaphore used to trigger callback invocation.
--- End diff --
The usage of semaphore here seems like a countUpLatch. Have you hit any
problem with the existing CountDownLatch approach?
> Update DataNode to use DatasetVolumeChecker
> -------------------------------------------
>
> Key: HDFS-11182
> URL: https://issues.apache.org/jira/browse/HDFS-11182
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
>
> Update DataNode to use the DatasetVolumeChecker class introduced in
> HDFS-11149 to parallelize disk checks.
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