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Hbase M7 Put Error with Map-Reduce

Question asked by rahul on Sep 23, 2014
I have map reduce job that puts the data into M7 tables. I prepare the HTable object in reducer's setup method and in cleanup method I flush changes and close the table connection.
Map-reduce jobs very frequently throws below Error:
`2014-09-24 04:54:50,3613 ERROR Client fs/client/fileclient/cc/ Thread: 1019 rpc err Connection timed out(110) 35.1 to, fid 6807.32.4768610, upd 1

ERROR Cidcache fs/client/fileclient/cc/ Thread: 22435 ReportNodeFailure failed, error Read-only file system(30) for cid 7892, server:

As far as table permission concerns, M7 tables are set to 777 permission.
Any suggestion what exactly causing this error?