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From "Pankaj Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15109) HM/RS failed to start when "fs.hdfs.impl.disable.cache" is set to true
Date Mon, 10 Oct 2016 05:29:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15561330#comment-15561330
] 

Pankaj Kumar commented on HBASE-15109:
--------------------------------------

Test case failures are not relevant. 
Those failed because of "java.lang.OutOfMemoryError: Java heap space".

I observed OOM is happening frequently in many QA run.

> 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-V2.patch, 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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