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Posted to issues@hbase.apache.org by "Jean-Daniel Cryans (JIRA)" <ji...@apache.org> on 2010/04/28 16:44:32 UTC
[jira] Commented: (HBASE-2497) ProcessServerShutdown throws
NullPointerException for offline regions
[ https://issues.apache.org/jira/browse/HBASE-2497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861818#action_12861818 ]
Jean-Daniel Cryans commented on HBASE-2497:
-------------------------------------------
Isn't this the same as HBASE-2479 or/and HBASE-2428?
> ProcessServerShutdown throws NullPointerException for offline regions
> ---------------------------------------------------------------------
>
> Key: HBASE-2497
> URL: https://issues.apache.org/jira/browse/HBASE-2497
> Project: Hadoop HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.20.3
> Reporter: Miklos Kurucz
> Attachments: pss_diff.txt
>
>
> When a regionsserver dies the master can run into the following bug.
> 2010-04-27 17:20:37,303 DEBUG org.apache.hadoop.hbase.master.HMaster: Processing todo: ProcessServerShutdown of dell106.cluster,60020,1272377612991
> 2010-04-27 17:20:37,303 INFO org.apache.hadoop.hbase.master.RegionServerOperation: process shutdown of server dell106.cluster,60020,1272377612991: logSplit: true, rootRescanned: true, numberOfMetaRegions: 1, onlineMetaRegions.size(): 1
> 2010-04-27 17:20:01,637 INFO org.apache.hadoop.hbase.master.RegionServerOperation: Log split complete, meta reassignment and scanning:
> 2010-04-27 17:20:01,653 DEBUG org.apache.hadoop.hbase.master.ProcessServerShutdown$ScanRootRegion: process server shutdown scanning root region on 10.1.3.124
> 2010-04-27 17:20:01,664 DEBUG org.apache.hadoop.hbase.master.RegionServerOperation: process server shutdown scanning root region on 10.1.3.124 finished master
> 2010-04-27 17:20:01,683 DEBUG org.apache.hadoop.hbase.master.ProcessServerShutdown$ScanMetaRegions: process server shutdown scanning .META.,,1 on 10.1.3.104:60020
> 2010-04-27 17:20:18,087 DEBUG org.apache.hadoop.hbase.master.ProcessServerShutdown$ScanMetaRegions: Exception in RetryableMetaOperation:
> 2010-04-27 17:20:18,118 WARN org.apache.hadoop.hbase.master.HMaster: Adding to delayed queue: ProcessServerShutdown of dell106.cluster,60020,1272377612991
> java.lang.RuntimeException: java.lang.NullPointerException
> at org.apache.hadoop.hbase.master.RetryableMetaOperation.doWithRetries(RetryableMetaOperation.java:100)
> at org.apache.hadoop.hbase.master.ProcessServerShutdown.process(ProcessServerShutdown.java:345)
> at org.apache.hadoop.hbase.master.HMaster.processToDoQueue(HMaster.java:509)
> at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:448)
> Caused by: java.lang.NullPointerException
> at org.apache.hadoop.hbase.util.Bytes.toLong(Bytes.java:487)
> at org.apache.hadoop.hbase.util.Bytes.toLong(Bytes.java:461)
> at org.apache.hadoop.hbase.master.ProcessServerShutdown.scanMetaRegion(ProcessServerShutdown.java:147)
> at org.apache.hadoop.hbase.master.ProcessServerShutdown$ScanMetaRegions.call(ProcessServerShutdown.java:264)
> at org.apache.hadoop.hbase.master.ProcessServerShutdown$ScanMetaRegions.call(ProcessServerShutdown.java:250)
> at org.apache.hadoop.hbase.master.RetryableMetaOperation.doWithRetries(RetryableMetaOperation.java:69)
> ... 3 more
> The problem is in ProcessServerShutdown.java at line 148-149:
> 146 String serverAddress =
> 147 Bytes.toString(values.getValue(CATALOG_FAMILY, SERVER_QUALIFIER));
> 148 long startCode =
> 149 Bytes.toLong(values.getValue(CATALOG_FAMILY, STARTCODE_QUALIFIER));
> 150 String serverName = null;
> 151 if (serverAddress != null && serverAddress.length() > 0) {
> 152 serverName = HServerInfo.getServerName(serverAddress, startCode);
> 153 }
> It should be modified to:
> 146 String serverAddress =
> 147 Bytes.toString(values.getValue(CATALOG_FAMILY, SERVER_QUALIFIER));
> 150 String serverName = null;
> 151 if (serverAddress != null && serverAddress.length() > 0) {
> 148 long startCode =
> 149 Bytes.toLong(values.getValue(CATALOG_FAMILY, STARTCODE_QUALIFIER));
> 152 serverName = HServerInfo.getServerName(serverAddress, startCode);
> 153 }
> As Bytes.toLong cannot handle the null pointer returned by getValue for missing STARTCODE_QUALIFIER of offline regions in META.
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