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From "Pankaj Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-15109) HM/RS failed to start when "fs.hdfs.impl.disable.cache" is set to true
Date Mon, 10 Oct 2016 03:02:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15561104#comment-15561104
] 

Pankaj Kumar edited comment on HBASE-15109 at 10/10/16 3:02 AM:
----------------------------------------------------------------

Hi [~tedyu], I checked HDFS code and it is by default false.

In FileSystem.java
{code}
String disableCacheName = String.format("fs.%s.impl.disable.cache", scheme);
if (conf.getBoolean(disableCacheName, false)) {
return createFileSystem(uri, conf);
}
{code}

Please have a look, It may be one of the use case scenario where client doesn't want to  cache
the FS.


was (Author: pankaj2461):
Hi [~tedyu], I checked HDFS code and it is by default false.
{code}
String disableCacheName = String.format("fs.%s.impl.disable.cache", scheme);
if (conf.getBoolean(disableCacheName, false)) {
return createFileSystem(uri, conf);
}
{code}

Please have a look, It may be one of the use case scenario where client doesn't want to  cache
the FS.

> HM/RS failed to start when "fs.hdfs.impl.disable.cache" is set to true
> ----------------------------------------------------------------------
>
>                 Key: HBASE-15109
>                 URL: https://issues.apache.org/jira/browse/HBASE-15109
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 2.0.0
>            Reporter: Pankaj Kumar
>            Assignee: Pankaj Kumar
>            Priority: Critical
>         Attachments: HBASE-15109-branch-1.patch, HBASE-15109.patch, HBASE-15109.patch
>
>
> HMaster failed to start during installing ShutdownHook when "fs.hdfs.impl.disable.cache"
is set to true.
> {noformat}
> 2016-10-10 10:33:28,367 FATAL [master/HOST-10-18-106-146/10.18.106.146:16000] master.HMaster:
Unhandled: Failed suppression of fs shutdown hook: org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer@19a003b4
> java.lang.RuntimeException: Failed suppression of fs shutdown hook: org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer@19a003b4
>         at org.apache.hadoop.hbase.regionserver.ShutdownHook.suppressHdfsShutdownHook(ShutdownHook.java:204)
>         at org.apache.hadoop.hbase.regionserver.ShutdownHook.install(ShutdownHook.java:84)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:950)
>         at java.lang.Thread.run(Thread.java:745)
> {noformat}
> And RegionServer is in blocking state until a master is available,
> {noformat}
> "regionserver/HOST-10-18-106-146/10.18.106.146:16020" #17 prio=5 os_prio=0 tid=0x0000000000e4e800
nid=0xdc38 in Object.wait() [0x00007f329dac6000]
>    java.lang.Thread.State: TIMED_WAITING (on object monitor)
>         at java.lang.Object.wait(Native Method)
>         at org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.blockUntilAvailable(ZooKeeperNodeTracker.java:159)
>         - locked <0x00000000ae25c0c8> (a org.apache.hadoop.hbase.zookeeper.MasterAddressTracker)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.blockAndCheckIfStopped(HRegionServer.java:870)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeZooKeeper(HRegionServer.java:809)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:783)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:943)
>         at java.lang.Thread.run(Thread.java:745)
> {noformat}
> During installation, first time it will try to suppress the HDFS shutdownhook by removing
the hdfsclientfinalizer from HDFS. Since fs.hdfs.impl.disable.cache is enabled, so removal
will be unsuccessful from HDFS  (FS is not cached) and RuntimeException will be thrown with
"Failed suppression of fs shutdown hook" message.
> In ShutdownHook,
> {code}
> if (!fsShutdownHooks.containsKey(hdfsClientFinalizer) &&
> !ShutdownHookManager.deleteShutdownHook(hdfsClientFinalizer)) {
> throw new RuntimeException("Failed suppression of fs shutdown hook: " +
> hdfsClientFinalizer);
> }
> {code}



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