Database Reference
In-Depth Information
One piece of advice here is to avoid trying to load data in sstables for the same
table using
json2sstable
multiple times, as it may leave an sstable in a corrupted
state. You can check
server.log
(under the
log
directory) for the following error:
Caused by:
org.apache.cassandra.io.compress.CorruptBlockException:
(/var/lib/cassandra/data/twitterkeyspace/dumpuser/
twitterkeyspace-dumpuser-jb-1-Data.db): corruption
detected, chunk at 0 of length 210.
at
org.apache.cassandra.io.compress.CompressedRandomAccessReader.decompressChunk
(CompressedRandomAccessReader.java:122)
at
org.apache.cassandra.io.compress.CompressedRandomAccessReader.reBuffer
(CompressedRandomAccessReader.java:87)
... 26 more
Trying to fetch data from a corrupted table (in this case the
dumpuser
table) using
the cql shell results in the following output:
cqlsh:twitterkeyspace> select * from dumpuser;
Request did not complete within rpc_timeout.
In this situation scrubbing and removing the corrupted data is our only option.
1.
The Cassandra distribution comes with
sstablescrub
utility,
which we'll use here:
$CASSANDRA_HOME/bin/sstablescrub
twitterkeyspace dumpuser
Running the preceding command results in the following output:
Pre-scrub sstables snapshotted into snapshot
pre-scrub-1412993550669
Scrubbing SSTableReader(path='/var/lib/
cassandra/data/twitterkeyspace/dumpuser/
twitterkeyspace-dumpuser-jb-1-Data.db') (218
bytes)
