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https://issues.apache.org/jira/browse/IGNITE-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15397415#comment-15397415
]
Ivan Veselovsky edited comment on IGNITE-3343 at 7/28/16 1:40 PM:
------------------------------------------------------------------
{code}
java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableList$1.set(Collections.java:1244)
at java.util.Collections.sort(Collections.java:221)
at
org.apache.ignite.internal.processors.igfs.IgfsUtils.preparePathModes(IgfsUtils.java:835)
at
org.apache.ignite.internal.processors.igfs.IgfsModeResolver.<init>(IgfsModeResolver.java:65)
at
org.apache.ignite.hadoop.fs.v1.IgniteHadoopFileSystem.initialize(IgniteHadoopFileSystem.java:313)
at
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2397)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89)
at
org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2431)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2413)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)
....
{code}
Problem originates from
org.apache.ignite.internal.processors.igfs.IgfsModeResolver#modesOrdered ,
which returns an unmodifiable list by design. Fixed by avoiding of an immutable
list creation: just a new mutable copy is created and returned there.
was (Author: iveselovskiy):
{code}
java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableList$1.set(Collections.java:1244)
at java.util.Collections.sort(Collections.java:221)
at
org.apache.ignite.internal.processors.igfs.IgfsUtils.preparePathModes(IgfsUtils.java:835)
at
org.apache.ignite.internal.processors.igfs.IgfsModeResolver.<init>(IgfsModeResolver.java:65)
at
org.apache.ignite.hadoop.fs.v1.IgniteHadoopFileSystem.initialize(IgniteHadoopFileSystem.java:313)
at
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2397)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89)
at
org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2431)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2413)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)
....
{code}
Problem originates from
org.apache.ignite.internal.processors.igfs.IgfsModeResolver#modesOrdered ,
which returns an unmodifiable list by design.
> IGFS: Do not query secondary file system properties during
> create/append/mkdirs.
> --------------------------------------------------------------------------------
>
> Key: IGNITE-3343
> URL: https://issues.apache.org/jira/browse/IGNITE-3343
> Project: Ignite
> Issue Type: Sub-task
> Components: IGFS
> Affects Versions: 1.6
> Reporter: Vladimir Ozerov
> Assignee: Ivan Veselovsky
> Priority: Critical
> Labels: performance
> Fix For: 1.7
>
>
> Currently when we create something in a secondary file system, we perform
> additional calls to the secondary file system to get file/directory info.
> This significantly slows down structural operations, while usually it is not
> really needed in most cases.
> We should do the following:
> 1) Do not write modification time, access time and properties for DUAL
> entries. Instead, we should propagate "info" and "listFiles" calls to
> secondary file system right away.
> 2) For {{create()}} we do not need length, as the file is either created from
> scratch, or truncated.
> 3) For {{append()}} we need to know current length, so the second file system
> call appears to be inevitable.
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