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https://issues.apache.org/jira/browse/HDFS-15493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17168560#comment-17168560
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Chengwei Wang commented on HDFS-15493:
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Submit v003 patch [^HDFS-15493.003.patch]
Base on two single thread executors, removed update lock.
Tested this patch twice:
{code:java}
Test1.
20/07/31 16:12:17 INFO namenode.FSImageFormatPBINode: Completed loading all
INodeDirectory sub-sections
20/07/31 16:12:36 INFO namenode.FSImageFormatPBINode: Completed update
blocks map and name cache, total waiting duration: 18615
20/07/31 16:12:37 INFO namenode.FSImageFormatProtobuf: Loaded FSImage in
431 seconds.
Test2.
20/07/31 16:39:20 INFO namenode.FSImageFormatPBINode: Completed loading all
INodeDirectory sub-sections
20/07/31 16:39:27 INFO namenode.FSImageFormatPBINode: Completed update
blocks map and name cache, total waiting duration: 7151
20/07/31 16:39:28 INFO namenode.FSImageFormatProtobuf: Loaded FSImage in
425 seconds.
{code}
> Update block map and name cache in parallel while loading fsimage.
> ------------------------------------------------------------------
>
> Key: HDFS-15493
> URL: https://issues.apache.org/jira/browse/HDFS-15493
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Chengwei Wang
> Priority: Major
> Attachments: HDFS-15493.001.patch, HDFS-15493.002.patch,
> HDFS-15493.003.patch, fsimage-loading.log
>
>
> While loading INodeDirectorySection of fsimage, it will update name cache and
> block map after added inode file to inode directory. It would reduce time
> cost of fsimage loading to enable these steps run in parallel.
> In our test case, with patch HDFS-13694 and HDFS-14617, the time cost to load
> fsimage (220M files & 240M blocks) is 470s, with this patch , the time cost
> reduc to 410s.
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