Jerry He created HBASE-16581:
--------------------------------
Summary: Optimize Replication queue transfers after server fail
over
Key: HBASE-16581
URL: https://issues.apache.org/jira/browse/HBASE-16581
Project: HBase
Issue Type: Improvement
Reporter: Jerry He
Assignee: Jerry He
Currently if a region server fails, the replication queue of this server will
be picked up by another region server. The problem is this queue can possibly
be huge and contains queues from other multiple or cascading server failures.
We had such a case in production. From zk_dump:
{code}
...
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1467603735059:
18748267
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1471723778060:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1468258960080:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1468204958990:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1469701010649:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1470409989238:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1471838985073:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1467142915090:
57804890
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1472181000614:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1471464567365:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1469486466965:
/hbase/replication/rs/r01data10-va-pub.xxx.ext,60020,1472680007498/1-r01data10-va-pub.xxx.ext,60020,1455993417125-r01data07-va-pub.xxx.ext,60020,1472680008225-r01data08-va-pub.xxx.ext,60020,1472680007318/r01data10-va-pub.xxx.ext%2C60020%2C1455993417125.1467787339841:
47812951
...
{code}
There were hundreds of wals hanging under this queue, coming from diferent
region servers, which took a long time to replicate.
We should have a better strategy which lets live region servers each grep part
of this nested queue, and replicate in parallel.
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