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https://issues.apache.org/jira/browse/HDFS-6102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13934026#comment-13934026
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Suresh Srinivas commented on HDFS-6102:
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bq. Enforce a configurable maximum on the # of entries per directory
I think this is reasonable. Recently we changed the default max length of file
name allowed. We should also add reasonable limit to the number of entries in a
directory.
> Cannot load an fsimage with a very large directory
> --------------------------------------------------
>
> Key: HDFS-6102
> URL: https://issues.apache.org/jira/browse/HDFS-6102
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.4.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Blocker
>
> Found by [~schu] during testing. We were creating a bunch of directories in a
> single directory to blow up the fsimage size, and it ends up we hit this
> error when trying to load a very large fsimage:
> {noformat}
> 2014-03-13 13:57:03,901 INFO
> org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode: Loading 24523605
> INodes.
> 2014-03-13 13:57:59,038 ERROR org.apache.hadoop.hdfs.server.namenode.FSImage:
> Failed to load image from
> FSImageFile(file=/dfs/nn/current/fsimage_0000000000024532742,
> cpktTxId=0000000000024532742)
> com.google.protobuf.InvalidProtocolBufferException: Protocol message was too
> large. May be malicious. Use CodedInputStream.setSizeLimit() to increase
> the size limit.
> at
> com.google.protobuf.InvalidProtocolBufferException.sizeLimitExceeded(InvalidProtocolBufferException.java:110)
> at
> com.google.protobuf.CodedInputStream.refillBuffer(CodedInputStream.java:755)
> at
> com.google.protobuf.CodedInputStream.readRawByte(CodedInputStream.java:769)
> at
> com.google.protobuf.CodedInputStream.readRawVarint64(CodedInputStream.java:462)
> at
> com.google.protobuf.CodedInputStream.readUInt64(CodedInputStream.java:188)
> at
> org.apache.hadoop.hdfs.server.namenode.FsImageProto$INodeDirectorySection$DirEntry.<init>(FsImageProto.java:9839)
> at
> org.apache.hadoop.hdfs.server.namenode.FsImageProto$INodeDirectorySection$DirEntry.<init>(FsImageProto.java:9770)
> at
> org.apache.hadoop.hdfs.server.namenode.FsImageProto$INodeDirectorySection$DirEntry$1.parsePartialFrom(FsImageProto.java:9901)
> at
> org.apache.hadoop.hdfs.server.namenode.FsImageProto$INodeDirectorySection$DirEntry$1.parsePartialFrom(FsImageProto.java:9896)
> at 52)
> ...
> {noformat}
> Some further research reveals there's a 64MB max size per PB message, which
> seems to be what we're hitting here.
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