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Hudson commented on HDFS-12130: ------------------------------- SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #12012 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/12012/]) Revert "HDFS-12130. Optimizing permission check for getContentSummary." (szetszwo: rev a1f12bb543778ddc243205eaa962e99da4d8f135) * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSPermissionChecker.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeReference.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectorySnapshottableFeature.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ContentSummaryComputationContext.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/DirectoryWithQuotaFeature.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockCollection.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirStatAndListingOp.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/Snapshot.java * (delete) hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestGetContentSummaryWithPermission.java HDFS-12130. Optimizing permission check for getContentSummary. (szetszwo: rev f413ee33df301659c4ca9024380c2354983dcc84) * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSPermissionChecker.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeReference.java * (add) hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestGetContentSummaryWithPermission.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectorySnapshottableFeature.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ContentSummaryComputationContext.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/DirectoryWithSnapshotFeature.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/Snapshot.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockCollection.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/DirectoryWithQuotaFeature.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirStatAndListingOp.java > Optimizing permission check for getContentSummary > ------------------------------------------------- > > Key: HDFS-12130 > URL: https://issues.apache.org/jira/browse/HDFS-12130 > Project: Hadoop HDFS > Issue Type: Improvement > Components: namenode > Reporter: Chen Liang > Assignee: Chen Liang > Fix For: 2.9.0, 3.0.0-beta1 > > Attachments: HDFS-12130.001.patch, HDFS-12130.002.patch, > HDFS-12130.003.patch > > > Currently, {{getContentSummary}} takes two phases to complete: > - phase1. check the permission of the entire subtree. If any subdirectory > does not have {{READ_EXECUTE}}, an access control exception is thrown and > {{getContentSummary}} terminates here (unless it's super user). > - phase2. If phase1 passed, it will then traverse the entire tree recursively > to get the actual content summary. > An issue is, both phases currently hold the fs lock. > Phase 2 has already been written that, it will yield the fs lock over time, > such that it does not block other operations for too long. However phase 1 > does not yield. Meaning it's possible that the permission check phase still > blocks things for long time. > One fix is to add lock yield to phase 1. But a simpler fix is to merge phase > 1 into phase 2. Namely, instead of doing a full traversal for permission > check first, we start with phase 2 directly, but for each directory, before > obtaining its summary, check its permission first. This way we take advantage > of existing lock yield in phase 2 code and still able to check permission and > terminate on access exception. > Thanks [~szetszwo] for the offline discussions! -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org