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Posted to hdfs-issues@hadoop.apache.org by "Lisheng Sun (Jira)" <ji...@apache.org> on 2020/02/21 06:59:00 UTC
[jira] [Updated] (HDFS-15174) Optimize ReplicaCachingGetSpaceUsed
by reducing unnecessary io operations
[ https://issues.apache.org/jira/browse/HDFS-15174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lisheng Sun updated HDFS-15174:
-------------------------------
Attachment: HDFS-15174-001.patch
Status: Patch Available (was: Open)
> Optimize ReplicaCachingGetSpaceUsed by reducing unnecessary io operations
> -------------------------------------------------------------------------
>
> Key: HDFS-15174
> URL: https://issues.apache.org/jira/browse/HDFS-15174
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Lisheng Sun
> Assignee: Lisheng Sun
> Priority: Major
> Attachments: HDFS-15174-001.patch
>
>
> Calculating the size of each block and the size of the meta file requires io operation In ReplicaCachingGetSpaceUsed#refresh(). Pressure on disk performance when there are many block. HDFS-14313 is intended to reduce io operation. So get block size by ReplicaInfo and meta size by DataChecksum#getChecksumSize().
> {code:java}
> @Override
> protected void refresh() {
> if (CollectionUtils.isNotEmpty(replicaInfos)) {
> for (ReplicaInfo replicaInfo : replicaInfos) {
> if (Objects.equals(replicaInfo.getVolume().getStorageID(),
> volume.getStorageID())) {
> dfsUsed += replicaInfo.getBlockDataLength();
> dfsUsed += replicaInfo.getMetadataLength();
> count++;
> }
> }
> }
> }
> {code}
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