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https://issues.apache.org/jira/browse/HBASE-21509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16700066#comment-16700066
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Bo Cui commented on HBASE-21509:
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for example
zk lost data、getMetaRegionLocation occur exception、KeeperException、TimeOut
they are small probabilities
but they may cause the return value of getMetaRegionLocation to be null
> /hbase/WALs directory has large number of hlogs, which cannot be deleted
> correctly
> ----------------------------------------------------------------------------------
>
> Key: HBASE-21509
> URL: https://issues.apache.org/jira/browse/HBASE-21509
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.3.1
> Reporter: Bo Cui
> Priority: Minor
>
> When HMaster is initializing, if getMetaRegionLocation() returns null value,
> then some wal(including metaWAL) cannot be deleted.
> for example
> before restarts
> /hbase/WALs/10-10-10-129,21302,1543048601526/10-10-10-129%2C21302%2C1543048601526.meta.1543048613941.meta
> after restarts
> /hbase/WALs/10-10-10-129,21302,1543048601526-splitting/10-10-10-129%2C21302%2C1543048601526.meta.1543048613941.meta
> /hbase/WALs/10-10-10-29,21302,1543048867527/10-10-10-29%2C21302%2C1543048867527.meta.1543048907265.meta
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